├── build.xml ├── manifest.mf ├── nbproject ├── build-impl.xml ├── genfiles.properties ├── project.properties └── project.xml └── src └── org └── javase └── genericsexamples ├── Calculator.java ├── CalculatorExample.java ├── GenericContainer.java ├── GenericNumberContainer.java ├── GenericNumberContainerExamples.java ├── LambdaExample.java ├── MultiGenericContainer.java ├── MultiGenericContainerExample.java ├── ObjectContainer.java ├── ObjectExample.java ├── WildcardExample.java └── coffeehouse ├── Bag.java ├── CoffeeBag.java ├── CoffeeCup.java ├── CoffeeSaleType.java ├── CoffeeType.java ├── Cup.java ├── Dark.java ├── DoughnutRoast.java ├── FrenchRoast.java ├── HouseBlend.java ├── ItalianRoast.java ├── JavaHouse.java ├── JavaHouseVisit.java ├── Light.java └── Medium.java /build.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | Builds, tests, and runs the project GenericsExamples. 12 | 13 | 73 | 74 | -------------------------------------------------------------------------------- /manifest.mf: -------------------------------------------------------------------------------- 1 | Manifest-Version: 1.0 2 | X-COMMENT: Main-Class will be added automatically by build 3 | 4 | -------------------------------------------------------------------------------- /nbproject/build-impl.xml: -------------------------------------------------------------------------------- 1 | 2 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159 | 160 | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191 | 192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 | 211 | 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 | 221 | 222 | 223 | 224 | 225 | 226 | Must set src.dir 227 | Must set test.src.dir 228 | Must set build.dir 229 | Must set dist.dir 230 | Must set build.classes.dir 231 | Must set dist.javadoc.dir 232 | Must set build.test.classes.dir 233 | Must set build.test.results.dir 234 | Must set build.classes.excludes 235 | Must set dist.jar 236 | 237 | 238 | 239 | 240 | 241 | 242 | 243 | 244 | 245 | 246 | 247 | 248 | 249 | 250 | 251 | 252 | 253 | 254 | 255 | 256 | 257 | 258 | 259 | 260 | 261 | 262 | 263 | 264 | 265 | 266 | 267 | 268 | 269 | 270 | 271 | 272 | 273 | 274 | 275 | 276 | 277 | 278 | 279 | 280 | 281 | 282 | 283 | 284 | 285 | 286 | 287 | 288 | 289 | 290 | 291 | 292 | 293 | 294 | 295 | 296 | 297 | 298 | 299 | 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 310 | 311 | 312 | 313 | 314 | 315 | 316 | 317 | 318 | 319 | 320 | 321 | 322 | 323 | 324 | 325 | 326 | 327 | 328 | 329 | 330 | 331 | 332 | 333 | 334 | 335 | 336 | Must set javac.includes 337 | 338 | 339 | 340 | 341 | 342 | 343 | 344 | 345 | 346 | 347 | 348 | 349 | 350 | 351 | 352 | 353 | 354 | 355 | 356 | 357 | 358 | 359 | 360 | 361 | 362 | 363 | 364 | 365 | 366 | 367 | 368 | 369 | 370 | 371 | 372 | 373 | 374 | 375 | 376 | 377 | 378 | 379 | 380 | 381 | 382 | 383 | 384 | 385 | 386 | 387 | 388 | 389 | 390 | 391 | 392 | 393 | 394 | 395 | 396 | 397 | 398 | 399 | 400 | 401 | 402 | 403 | 404 | 405 | 406 | 407 | 408 | 409 | 410 | 411 | 412 | 413 | 414 | 415 | 416 | 417 | 418 | 419 | 420 | 421 | 422 | 423 | 424 | 425 | 426 | 427 | 428 | 429 | 430 | 431 | 432 | 433 | 434 | 435 | 436 | 437 | 438 | 439 | 440 | 441 | 442 | 443 | 444 | 445 | 446 | 447 | 448 | 449 | 450 | 451 | 452 | 453 | 454 | 455 | 456 | 457 | 458 | 459 | 460 | 461 | 462 | 463 | 464 | 465 | No tests executed. 466 | 467 | 468 | 469 | 470 | 471 | 472 | 473 | 474 | 475 | 476 | 477 | 478 | 479 | 480 | 481 | 482 | 483 | 484 | 485 | 486 | 487 | 488 | 489 | 490 | 491 | 492 | 493 | 494 | 495 | 496 | 497 | 498 | 499 | 500 | 501 | 502 | 503 | 504 | 505 | 506 | 507 | 508 | 509 | 510 | 511 | 512 | 513 | 514 | 515 | 516 | 517 | 518 | 519 | 520 | 521 | 522 | 523 | 524 | 525 | 526 | 527 | 528 | 529 | 530 | 531 | 532 | 533 | 534 | 535 | 536 | 537 | 538 | 539 | 540 | 541 | 542 | 543 | 544 | 545 | 546 | 547 | 548 | 549 | 550 | 551 | 552 | 553 | 554 | 555 | 556 | 557 | 558 | 559 | 560 | 561 | 562 | 563 | 564 | 565 | 566 | 567 | 568 | 569 | 570 | 571 | 572 | 573 | 574 | 575 | 576 | 577 | 578 | 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729 | 730 | 731 | 732 | 733 | 734 | 735 | 736 | 737 | 738 | 739 | 740 | 741 | 742 | 743 | 744 | 745 | 746 | 747 | 748 | 749 | 750 | 751 | 752 | 753 | 754 | 755 | 756 | 757 | 758 | 759 | 760 | 761 | 762 | 763 | 764 | 765 | 766 | 767 | 768 | 769 | 770 | 771 | 772 | 773 | 774 | 775 | 776 | 777 | 778 | 779 | 780 | 781 | 782 | 783 | 784 | 785 | 786 | 787 | 788 | 789 | 790 | 791 | 792 | 793 | 794 | 795 | 796 | 797 | 798 | 799 | 800 | 801 | 802 | 803 | 804 | 805 | 806 | 807 | 808 | 809 | 810 | 811 | 812 | 813 | 814 | 815 | 816 | 817 | 818 | 819 | 820 | 821 | 822 | 823 | 824 | 825 | 826 | 827 | 828 | 829 | 830 | 831 | 832 | 833 | 834 | 835 | 836 | 837 | 838 | 839 | 840 | 841 | 842 | 843 | 844 | 845 | 846 | 847 | 848 | 849 | 850 | 851 | 852 | 853 | 854 | 855 | 856 | 857 | 858 | 859 | 860 | 861 | 862 | 863 | 864 | 865 | 866 | 867 | 868 | 869 | 870 | 871 | 872 | 873 | 874 | 875 | 876 | 877 | 878 | 879 | 884 | 885 | 886 | 887 | 888 | 889 | 890 | 891 | 892 | 893 | 894 | 895 | 896 | 897 | 898 | 899 | 900 | 901 | 902 | 903 | 904 | 905 | 906 | 907 | 908 | 909 | 910 | 911 | 912 | 913 | 914 | 915 | 916 | 917 | 918 | 919 | 920 | 921 | 922 | 923 | 924 | 925 | 926 | 927 | 928 | 929 | 930 | 931 | 932 | 933 | 934 | 935 | 936 | 937 | 938 | 939 | 940 | 941 | 942 | 943 | 944 | Must select some files in the IDE or set javac.includes 945 | 946 | 947 | 948 | 949 | 950 | 951 | 952 | 953 | 958 | 959 | 960 | 961 | 962 | 963 | 964 | 965 | 966 | 967 | 968 | 969 | 970 | 971 | 972 | 973 | 974 | 975 | 976 | 977 | 978 | 979 | 980 | 981 | 982 | 983 | 984 | 985 | 986 | 987 | 988 | 989 | 990 | 991 | 992 | 993 | 994 | To run this application from the command line without Ant, try: 995 | 996 | java -jar "${dist.jar.resolved}" 997 | 998 | 999 | 1000 | 1001 | 1002 | 1003 | 1004 | 1005 | 1006 | 1007 | 1008 | 1009 | 1010 | 1011 | 1012 | 1013 | 1014 | 1015 | 1016 | 1017 | 1018 | 1019 | 1020 | 1021 | 1022 | 1023 | 1024 | 1025 | 1026 | 1027 | 1032 | 1033 | 1034 | 1035 | 1036 | 1037 | 1038 | 1039 | 1040 | 1041 | 1042 | 1043 | Must select one file in the IDE or set run.class 1044 | 1045 | 1046 | 1047 | Must select one file in the IDE or set run.class 1048 | 1049 | 1050 | 1055 | 1056 | 1057 | 1058 | 1059 | 1060 | 1061 | 1062 | 1063 | 1064 | 1065 | 1066 | 1067 | 1068 | 1069 | 1070 | 1071 | 1072 | 1073 | 1074 | Must select one file in the IDE or set debug.class 1075 | 1076 | 1077 | 1078 | 1079 | Must select one file in the IDE or set debug.class 1080 | 1081 | 1082 | 1083 | 1084 | Must set fix.includes 1085 | 1086 | 1087 | 1088 | 1089 | 1090 | 1091 | 1096 | 1099 | 1100 | This target only works when run from inside the NetBeans IDE. 1101 | 1102 | 1103 | 1104 | 1105 | 1106 | 1107 | 1108 | 1109 | Must select one file in the IDE or set profile.class 1110 | This target only works when run from inside the NetBeans IDE. 1111 | 1112 | 1113 | 1114 | 1115 | 1116 | 1117 | 1118 | 1119 | This target only works when run from inside the NetBeans IDE. 1120 | 1121 | 1122 | 1123 | 1124 | 1125 | 1126 | 1127 | 1128 | 1129 | 1130 | 1131 | 1132 | This target only works when run from inside the NetBeans IDE. 1133 | 1134 | 1135 | 1136 | 1137 | 1138 | 1139 | 1140 | 1141 | 1142 | 1143 | 1144 | 1145 | 1146 | 1147 | 1148 | 1149 | 1150 | 1151 | 1152 | 1153 | 1154 | 1157 | 1158 | 1159 | 1160 | 1161 | 1162 | 1163 | 1164 | 1165 | 1166 | 1167 | 1168 | 1169 | 1170 | Must select one file in the IDE or set run.class 1171 | 1172 | 1173 | 1174 | 1175 | 1176 | Must select some files in the IDE or set test.includes 1177 | 1178 | 1179 | 1180 | 1181 | Must select one file in the IDE or set run.class 1182 | 1183 | 1184 | 1185 | 1186 | Must select one file in the IDE or set applet.url 1187 | 1188 | 1189 | 1190 | 1195 | 1196 | 1197 | 1198 | 1199 | 1200 | 1201 | 1202 | 1203 | 1204 | 1205 | 1206 | 1207 | 1208 | 1209 | 1210 | 1211 | 1212 | 1213 | 1214 | 1215 | 1216 | 1217 | 1218 | 1219 | 1220 | 1221 | 1222 | 1223 | 1224 | 1225 | 1226 | 1227 | 1228 | 1229 | 1230 | 1231 | 1232 | 1233 | 1234 | 1239 | 1240 | 1241 | 1242 | 1243 | 1244 | 1245 | 1246 | 1247 | 1248 | 1249 | 1250 | 1251 | 1252 | 1253 | 1254 | 1255 | 1256 | 1257 | 1258 | 1259 | 1260 | 1261 | 1262 | 1263 | 1264 | 1265 | Must select some files in the IDE or set javac.includes 1266 | 1267 | 1268 | 1269 | 1270 | 1271 | 1272 | 1273 | 1274 | 1275 | 1276 | 1277 | 1282 | 1283 | 1284 | 1285 | 1286 | 1287 | 1288 | 1289 | Some tests failed; see details above. 1290 | 1291 | 1292 | 1293 | 1294 | 1295 | 1296 | 1297 | 1298 | Must select some files in the IDE or set test.includes 1299 | 1300 | 1301 | 1302 | Some tests failed; see details above. 1303 | 1304 | 1305 | 1306 | Must select some files in the IDE or set test.class 1307 | Must select some method in the IDE or set test.method 1308 | 1309 | 1310 | 1311 | Some tests failed; see details above. 1312 | 1313 | 1314 | 1319 | 1320 | Must select one file in the IDE or set test.class 1321 | 1322 | 1323 | 1324 | Must select one file in the IDE or set test.class 1325 | Must select some method in the IDE or set test.method 1326 | 1327 | 1328 | 1329 | 1330 | 1331 | 1332 | 1333 | 1334 | 1335 | 1336 | 1337 | 1342 | 1343 | Must select one file in the IDE or set applet.url 1344 | 1345 | 1346 | 1347 | 1348 | 1349 | 1350 | 1355 | 1356 | Must select one file in the IDE or set applet.url 1357 | 1358 | 1359 | 1360 | 1361 | 1362 | 1363 | 1364 | 1369 | 1370 | 1371 | 1372 | 1373 | 1374 | 1375 | 1376 | 1377 | 1378 | 1379 | 1380 | 1381 | 1382 | 1383 | 1384 | 1385 | 1386 | 1387 | 1388 | 1389 | 1390 | 1391 | 1392 | 1393 | 1394 | 1395 | 1396 | 1397 | 1398 | 1399 | 1400 | 1401 | 1402 | 1403 | 1404 | 1405 | 1406 | 1407 | 1408 | 1409 | 1410 | 1411 | 1412 | 1413 | 1414 | -------------------------------------------------------------------------------- /nbproject/genfiles.properties: -------------------------------------------------------------------------------- 1 | build.xml.data.CRC32=4db16603 2 | build.xml.script.CRC32=8af69ec8 3 | build.xml.stylesheet.CRC32=8064a381@1.74.2.48 4 | # This file is used by a NetBeans-based IDE to track changes in generated files such as build-impl.xml. 5 | # Do not edit this file. You may delete it but then the IDE will never regenerate such files for you. 6 | nbproject/build-impl.xml.data.CRC32=4db16603 7 | nbproject/build-impl.xml.script.CRC32=5d4fe582 8 | nbproject/build-impl.xml.stylesheet.CRC32=876e7a8f@1.74.2.48 9 | -------------------------------------------------------------------------------- /nbproject/project.properties: -------------------------------------------------------------------------------- 1 | annotation.processing.enabled=true 2 | annotation.processing.enabled.in.editor=false 3 | annotation.processing.processors.list= 4 | annotation.processing.run.all.processors=true 5 | annotation.processing.source.output=${build.generated.sources.dir}/ap-source-output 6 | application.title=GenericsExamples 7 | application.vendor=Juneau 8 | build.classes.dir=${build.dir}/classes 9 | build.classes.excludes=**/*.java,**/*.form 10 | # This directory is removed when the project is cleaned: 11 | build.dir=build 12 | build.generated.dir=${build.dir}/generated 13 | build.generated.sources.dir=${build.dir}/generated-sources 14 | # Only compile against the classpath explicitly listed here: 15 | build.sysclasspath=ignore 16 | build.test.classes.dir=${build.dir}/test/classes 17 | build.test.results.dir=${build.dir}/test/results 18 | # Uncomment to specify the preferred debugger connection transport: 19 | #debug.transport=dt_socket 20 | debug.classpath=\ 21 | ${run.classpath} 22 | debug.test.classpath=\ 23 | ${run.test.classpath} 24 | # Files in build.classes.dir which should be excluded from distribution jar 25 | dist.archive.excludes= 26 | # This directory is removed when the project is cleaned: 27 | dist.dir=dist 28 | dist.jar=${dist.dir}/GenericsExamples.jar 29 | dist.javadoc.dir=${dist.dir}/javadoc 30 | endorsed.classpath= 31 | excludes= 32 | includes=** 33 | jar.compress=false 34 | javac.classpath= 35 | # Space-separated list of extra javac options 36 | javac.compilerargs= 37 | javac.deprecation=false 38 | javac.processorpath=\ 39 | ${javac.classpath} 40 | javac.source=1.8 41 | javac.target=1.8 42 | javac.test.classpath=\ 43 | ${javac.classpath}:\ 44 | ${build.classes.dir} 45 | javac.test.processorpath=\ 46 | ${javac.test.classpath} 47 | javadoc.additionalparam= 48 | javadoc.author=false 49 | javadoc.encoding=${source.encoding} 50 | javadoc.noindex=false 51 | javadoc.nonavbar=false 52 | javadoc.notree=false 53 | javadoc.private=false 54 | javadoc.splitindex=true 55 | javadoc.use=true 56 | javadoc.version=false 57 | javadoc.windowtitle= 58 | main.class=org.javase.genericsexamples.coffeehouse.JavaHouseVisit 59 | manifest.file=manifest.mf 60 | meta.inf.dir=${src.dir}/META-INF 61 | mkdist.disabled=false 62 | platform.active=default_platform 63 | run.classpath=\ 64 | ${javac.classpath}:\ 65 | ${build.classes.dir} 66 | # Space-separated list of JVM arguments used when running the project. 67 | # You may also define separate properties like run-sys-prop.name=value instead of -Dname=value. 68 | # To set system properties for unit tests define test-sys-prop.name=value: 69 | run.jvmargs= 70 | run.test.classpath=\ 71 | ${javac.test.classpath}:\ 72 | ${build.test.classes.dir} 73 | source.encoding=UTF-8 74 | src.dir=src 75 | test.src.dir=test 76 | -------------------------------------------------------------------------------- /nbproject/project.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | org.netbeans.modules.java.j2seproject 4 | 5 | 6 | GenericsExamples 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/Calculator.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public class Calculator { 9 | 10 | /** 11 | * Example of a non-generic add method, which works only with Integer types. 12 | * @param a 13 | * @param b 14 | * @return 15 | */ 16 | public static Integer addInteger(Integer a, Integer b){ 17 | return a + b; 18 | } 19 | 20 | /** 21 | * Example of non-generic add method, which works only with Float types. 22 | * @param a 23 | * @param b 24 | * @return 25 | */ 26 | public static Float addFloat(Float a, Float b){ 27 | return a + b; 28 | } 29 | 30 | /** 31 | * Generic method that accepts two GenericContainer objects, and adds their 32 | * values together, returning the result in double format 33 | * @param 34 | * @param a 35 | * @param b 36 | * @return 37 | */ 38 | public static double add(N a, N b){ 39 | double sum = 0; 40 | sum = a.doubleValue() + b.doubleValue(); 41 | return sum; 42 | } 43 | 44 | 45 | 46 | 47 | } 48 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/CalculatorExample.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples; 4 | 5 | /** 6 | * 7 | * @author Juneau 8 | */ 9 | public class CalculatorExample { 10 | public static void main(String[] args){ 11 | 12 | float floatValue = Calculator.addFloat(2f, 3f); 13 | System.out.println("Float Value: " + floatValue); 14 | 15 | int intValue = Calculator.addInteger(3, 4); 16 | System.out.println("Integer Value: " + intValue); 17 | 18 | double genericValue1 = Calculator.add(3, 3f); 19 | System.out.println("The int + float result: " + genericValue1); 20 | 21 | double genericValue2 = Calculator.add(7.54, 174); 22 | System.out.println("The double + int result: " + genericValue2); 23 | 24 | // Causes a ClassCastException because String is not a subtype of java.lang.Number 25 | //double genericValue3 = Calculator.add("Not valid", 3f); 26 | //System.out.println("The invalid result: " + genericValue3); 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/GenericContainer.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples; 3 | 4 | /** 5 | * Generic Container 6 | * @author Juneau 7 | */ 8 | public class GenericContainer { 9 | private T obj; 10 | 11 | public GenericContainer(){ 12 | } 13 | 14 | public GenericContainer(T t){ 15 | obj = t; 16 | } 17 | /** 18 | * @return the obj 19 | */ 20 | public T getObj() { 21 | return obj; 22 | } 23 | 24 | /** 25 | * @param obj the obj to set 26 | */ 27 | public void setObj(T t) { 28 | obj = t; 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/GenericNumberContainer.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public class GenericNumberContainer { 9 | private T obj; 10 | 11 | public GenericNumberContainer(){ 12 | } 13 | 14 | public GenericNumberContainer(T t){ 15 | obj = t; 16 | } 17 | /** 18 | * @return the obj 19 | */ 20 | public T getObj() { 21 | return obj; 22 | } 23 | 24 | /** 25 | * @param obj the obj to set 26 | */ 27 | public void setObj(T t) { 28 | obj = t; 29 | } 30 | } 31 | 32 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/GenericNumberContainerExamples.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples; 4 | 5 | /** 6 | * 7 | * @author Juneau 8 | */ 9 | public class GenericNumberContainerExamples { 10 | public static void main(String[] args){ 11 | GenericNumberContainer gn = new GenericNumberContainer(); 12 | gn.setObj(3); 13 | // Type argument String is not within the upper bounds of type-variable T 14 | //GenericNumberContainer gn2 = new GenericNumberContainer(); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/LambdaExample.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples; 4 | 5 | import java.util.ArrayList; 6 | import java.util.List; 7 | import java.util.function.Predicate; 8 | 9 | /** 10 | * 11 | * @author Juneau 12 | */ 13 | public class LambdaExample { 14 | 15 | public static void main(String[] args){ 16 | List bookList = new ArrayList<>(); 17 | bookList.add("Java 8 Recipes"); 18 | bookList.add("Java EE 7 Recipes"); 19 | bookList.add("Introducing Java EE 7"); 20 | bookList.add("JavaFX 8: Introduction By Example"); 21 | compareStrings(bookList, (n)->n.contains("Java EE")); 22 | } 23 | 24 | public static void compareStrings(List list, Predicate predicate) { 25 | list.stream().filter((n) -> (predicate.test(n))).forEach((n) -> { 26 | System.out.println(n + " "); 27 | }); 28 | } 29 | 30 | } 31 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/MultiGenericContainer.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples; 4 | 5 | /** 6 | * A Generic Container Implementation 7 | * @author Juneau 8 | */ 9 | public class MultiGenericContainer { 10 | private T firstPosition; 11 | private S secondPosition; 12 | 13 | public MultiGenericContainer(T firstPosition, S secondPosition){ 14 | this.firstPosition = firstPosition; 15 | this.secondPosition = secondPosition; 16 | } 17 | 18 | public T getFirstPosition(){ 19 | return firstPosition; 20 | } 21 | 22 | public void setFirstPosition(T firstPosition){ 23 | this.firstPosition = firstPosition; 24 | } 25 | 26 | public S getSecondPosition(){ 27 | return secondPosition; 28 | } 29 | 30 | public void setSecondPosition(S secondPosition){ 31 | this.secondPosition = secondPosition; 32 | } 33 | 34 | } 35 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/MultiGenericContainerExample.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples; 3 | 4 | /** 5 | * Using a generic map implementation 6 | * @author Juneau 7 | */ 8 | public class MultiGenericContainerExample { 9 | public static void main(String[] args){ 10 | MultiGenericContainer mondayWeather = 11 | new MultiGenericContainer("Monday", "Sunny"); 12 | MultiGenericContainer dayOfWeekDegrees = 13 | new MultiGenericContainer<>(1, 78.0); 14 | 15 | String mondayForecast = mondayWeather.getFirstPosition(); 16 | 17 | // The following would result in an incompatible types error 18 | // int mondayOutlook = mondayWeather.getSecondPosition(); 19 | double sundayDegrees = dayOfWeekDegrees.getSecondPosition(); 20 | 21 | // Change the Monday outlook to cloudy 22 | mondayWeather.setSecondPosition("Cloudy"); 23 | // Attempt to accidentally pass the temperature to the mondayWeather instance 24 | // as the secondPosition will result in a compiler error 25 | // mondayWeather.setSecondPosition(80.0); 26 | 27 | 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/ObjectContainer.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples; 3 | 4 | /** 5 | * Object Container 6 | * @author Juneau 7 | */ 8 | public class ObjectContainer { 9 | private Object obj; 10 | 11 | /** 12 | * @return the obj 13 | */ 14 | public Object getObj() { 15 | return obj; 16 | } 17 | 18 | /** 19 | * @param obj the obj to set 20 | */ 21 | public void setObj(Object obj) { 22 | this.obj = obj; 23 | } 24 | 25 | } 26 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/ObjectExample.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples; 4 | 5 | import java.util.ArrayList; 6 | import java.util.List; 7 | 8 | /** 9 | * 10 | * @author Juneau 11 | */ 12 | public class ObjectExample { 13 | public static void main(String[] args){ 14 | testObject(); 15 | testGenerics(); 16 | collectionsTests(); 17 | } 18 | 19 | public static void testObject(){ 20 | ObjectContainer myObj = new ObjectContainer(); 21 | 22 | // store a string 23 | myObj.setObj("Test"); 24 | System.out.println("Value of myObj:" + myObj.getObj()); 25 | // store an int 26 | myObj.setObj(3); 27 | System.out.println("Value of myObj:" + myObj.getObj()); 28 | 29 | List objectList = new ArrayList(); 30 | objectList.add(myObj); 31 | // We have to cast...and we must be sure to cast the correct type! 32 | // String myStr = (String) ((ObjectContainer)objectList.get(0)).getObj(); // ClassCastException 33 | 34 | } 35 | 36 | /** 37 | * Utilizing a container that uses generics allows us to store any type 38 | * of data within the object in a type-safe manner 39 | */ 40 | public static void testGenerics(){ 41 | GenericContainer stringContainer = new GenericContainer(); 42 | stringContainer.setObj(new String("Test")); 43 | //stringContainer.setObj(3); // will not compile...type error 44 | System.out.println("Value of stringContainer :" + stringContainer.getObj()); 45 | GenericContainer intContainer = new GenericContainer(); 46 | intContainer.setObj(3); 47 | intContainer.setObj(5); 48 | //intContainer.setObj("Int"); // will not compile 49 | System.out.println("Value of intContainer: " + intContainer.getObj()); 50 | } 51 | 52 | public static void collectionsTests(){ 53 | List myObjList = new ArrayList(); 54 | 55 | for(int x=0; x <=10; x++){ 56 | ObjectContainer myObj = new ObjectContainer(); 57 | myObj.setObj("Test" + x); 58 | myObjList.add(myObj); 59 | } 60 | // Get the objects, we need to cast 61 | for(int x=0; x <= myObjList.size()-1; x++){ 62 | ObjectContainer obj = (ObjectContainer) myObjList.get(x); 63 | System.out.println("Object Value: " + obj.getObj()); 64 | } 65 | 66 | List genericList = new ArrayList(); 67 | 68 | for(int x=0; x <=10; x++){ 69 | GenericContainer myGeneric = new GenericContainer(); 70 | myGeneric.setObj(" Generic Test" + x); 71 | genericList.add(myGeneric); 72 | } 73 | // Get the objects, no need to cast 74 | for(int x=0; x <= myObjList.size()-1; x++){ 75 | GenericContainer obj = genericList.get(x); 76 | String objectString = obj.getObj(); 77 | // Do something with the string...here we will print it 78 | System.out.println(objectString); 79 | } 80 | 81 | } 82 | } 83 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/WildcardExample.java: -------------------------------------------------------------------------------- 1 | /* 2 | * To change this license header, choose License Headers in Project Properties. 3 | * To change this template file, choose Tools | Templates 4 | * and open the template in the editor. 5 | */ 6 | 7 | package org.javase.genericsexamples; 8 | 9 | import java.util.ArrayList; 10 | import java.util.List; 11 | 12 | /** 13 | * 14 | * @author Juneau 15 | */ 16 | public class WildcardExample { 17 | public static void main(String[] args){ 18 | List intList = new ArrayList(); 19 | intList.add(2); 20 | intList.add(4); 21 | intList.add(6); 22 | 23 | List strList = new ArrayList(); 24 | strList.add("two"); 25 | strList.add("four"); 26 | strList.add("six"); 27 | 28 | List objList = new ArrayList(); 29 | objList.add("two"); 30 | objList.add("four"); 31 | objList.add(strList); 32 | 33 | printList(intList); 34 | printList(strList); 35 | printList(objList); 36 | checkList(intList, 3); 37 | checkList(objList, strList); 38 | checkList(strList, objList); 39 | 40 | checkNumber(intList, 3); 41 | // The following will not work since strList is not a List of Number types 42 | //checkNumber(strList, "three"); 43 | } 44 | 45 | /** 46 | * This method will print a List of unknown type 47 | * @param myList 48 | */ 49 | public static void printList(List myList){ 50 | for(Object e:myList){ 51 | System.out.println(e); 52 | } 53 | } 54 | 55 | public static void checkList(List myList, T obj){ 56 | if(myList.contains(obj)){ 57 | System.out.println("The list " + myList + " contains the element: " + obj); 58 | } else { 59 | System.out.println("The list " + myList + " does not contain the element: " + obj); 60 | } 61 | } 62 | 63 | public static void checkNumber(List myList, T obj){ 64 | if(myList.contains(obj)){ 65 | System.out.println("The list " + myList + " contains the element: " + obj); 66 | } else { 67 | System.out.println("The list " + myList + " does not contain the element: " + obj); 68 | } 69 | } 70 | } 71 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/Bag.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public interface Bag extends CoffeeSaleType { 9 | double getWeight(); 10 | } 11 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/CoffeeBag.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public class CoffeeBag implements Bag { 9 | 10 | private double ounces; 11 | private CoffeeType type; 12 | 13 | public CoffeeBag(CoffeeType type, double ounces){ 14 | this.type = type; 15 | this.ounces = ounces; 16 | } 17 | 18 | @Override 19 | public double getWeight() { 20 | return this.ounces; 21 | } 22 | 23 | /** 24 | * @param size the size to set 25 | */ 26 | public void setWeight(double ounces) { 27 | this.ounces = ounces; 28 | } 29 | 30 | /** 31 | * @return the type 32 | */ 33 | public CoffeeType getType() { 34 | return this.type; 35 | } 36 | 37 | /** 38 | * @param type the type to set 39 | */ 40 | public void setType(CoffeeType type) { 41 | this.type = type; 42 | } 43 | 44 | } 45 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/CoffeeCup.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public class CoffeeCup implements Cup { 9 | private double cupSize; 10 | private CoffeeType type; 11 | 12 | public CoffeeCup(CoffeeType type, 13 | double cupSize){ 14 | this.type = type; 15 | this.cupSize = cupSize; 16 | } 17 | 18 | /** 19 | * @return the cupSize 20 | */ 21 | public double getCupSize() { 22 | return cupSize; 23 | } 24 | 25 | /** 26 | * @param cupSize the cupSize to set 27 | */ 28 | public void setCupSize(double cupSize) { 29 | this.cupSize = cupSize; 30 | } 31 | 32 | /** 33 | * @return the type 34 | */ 35 | public CoffeeType getType() { 36 | return type; 37 | } 38 | 39 | /** 40 | * @param type the type to set 41 | */ 42 | public void setType(CoffeeType type) { 43 | this.type = type; 44 | } 45 | 46 | 47 | } 48 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/CoffeeSaleType.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public interface CoffeeSaleType { 9 | public CoffeeType getType(); 10 | } 11 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/CoffeeType.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples.coffeehouse; 4 | 5 | import java.util.List; 6 | 7 | /** 8 | * 9 | * @author Juneau 10 | */ 11 | public abstract class CoffeeType { 12 | static final String ROBUST = "ROBUST"; 13 | static final String BOLD = "BOLD"; 14 | static final String AROMATIC = "AROMATIC"; 15 | static final String SWEET = "SWEET"; 16 | static final String TOASTY = "TOASTY"; 17 | static final String WINEY_UNDERTONES = "WINEY"; 18 | static final String MEDIUM = "MEDIUM"; 19 | static final String GROUND = "GROUND"; 20 | static final String WHOLE_BEAN = "WHOLE_BEAN"; 21 | 22 | public Class getType(){ 23 | return this.getClass(); 24 | }; 25 | 26 | public abstract List getDescription(); 27 | } 28 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/Cup.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public interface Cup extends CoffeeSaleType { 9 | double getCupSize(); 10 | } 11 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/Dark.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | /** 5 | * 6 | * @author Juneau 7 | */ 8 | public interface Dark { 9 | 10 | } 11 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/DoughnutRoast.java: -------------------------------------------------------------------------------- 1 | 2 | package org.javase.genericsexamples.coffeehouse; 3 | 4 | import java.util.ArrayList; 5 | import java.util.List; 6 | 7 | /** 8 | * 9 | * @author Juneau 10 | */ 11 | public class DoughnutRoast extends CoffeeType implements Medium { 12 | List description; 13 | 14 | public DoughnutRoast(){ 15 | description = new ArrayList(); 16 | description.add(AROMATIC); 17 | description.add(SWEET); 18 | description.add(GROUND); 19 | } 20 | 21 | @Override 22 | public List getDescription(){ 23 | return description; 24 | } 25 | 26 | 27 | } 28 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/FrenchRoast.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples.coffeehouse; 4 | 5 | import java.util.ArrayList; 6 | import java.util.List; 7 | 8 | /** 9 | * 10 | * @author Juneau 11 | */ 12 | public class FrenchRoast extends CoffeeType implements Dark { 13 | List description; 14 | 15 | public FrenchRoast(){ 16 | description = new ArrayList(); 17 | description.add(AROMATIC); 18 | description.add(BOLD); 19 | description.add(WHOLE_BEAN); 20 | } 21 | 22 | @Override 23 | public List getDescription(){ 24 | return description; 25 | } 26 | 27 | 28 | } 29 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/HouseBlend.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples.coffeehouse; 4 | 5 | import java.util.ArrayList; 6 | import java.util.List; 7 | 8 | 9 | /** 10 | * 11 | * @author Juneau 12 | */ 13 | public class HouseBlend extends CoffeeType implements Light { 14 | List description; 15 | 16 | public HouseBlend(){ 17 | description = new ArrayList(); 18 | description.add(TOASTY); 19 | description.add(GROUND); 20 | } 21 | 22 | @Override 23 | public List getDescription(){ 24 | return description; 25 | } 26 | 27 | 28 | } 29 | 30 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/ItalianRoast.java: -------------------------------------------------------------------------------- 1 | /* 2 | * To change this license header, choose License Headers in Project Properties. 3 | * To change this template file, choose Tools | Templates 4 | * and open the template in the editor. 5 | */ 6 | 7 | package org.javase.genericsexamples.coffeehouse; 8 | 9 | import java.util.ArrayList; 10 | import java.util.List; 11 | 12 | /** 13 | * 14 | * @author Juneau 15 | */ 16 | public class ItalianRoast extends CoffeeType implements Dark { 17 | List description; 18 | 19 | public ItalianRoast(){ 20 | description = new ArrayList(); 21 | description.add(BOLD); 22 | description.add(ROBUST); 23 | description.add(WINEY_UNDERTONES); 24 | description.add(WHOLE_BEAN); 25 | } 26 | 27 | @Override 28 | public List getDescription() { 29 | return description; 30 | } 31 | 32 | } 33 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/JavaHouse.java: -------------------------------------------------------------------------------- 1 | package org.javase.genericsexamples.coffeehouse; 2 | 3 | import java.util.ArrayList; 4 | import java.util.List; 5 | 6 | /** 7 | * Java Coffee House Utility Class 8 | * 9 | * @author Juneau 10 | */ 11 | public class JavaHouse { 12 | 13 | List purchase = new ArrayList<>(); 14 | List cupsPurchased = new ArrayList<>(); 15 | List bagsPurchased = new ArrayList<>(); 16 | List darkTypes = new ArrayList<>(); 17 | List mediumTypes = new ArrayList<>(); 18 | List lightTypes = new ArrayList<>(); 19 | 20 | public JavaHouse() { 21 | 22 | } 23 | 24 | /** 25 | * Return the total purchase list 26 | * 27 | * @return 28 | */ 29 | public List getCurrentPurchase() { 30 | return purchase; 31 | } 32 | 33 | /** 34 | * Add a cup of coffee to the purchase 35 | * 36 | * @param coffeeType 37 | * @param size 38 | */ 39 | public void addCup(CoffeeType coffeeType, double size) { 40 | Cup cup = new CoffeeCup(coffeeType, size); 41 | cupsPurchased.add(cup); 42 | } 43 | 44 | /** 45 | * Add a list of CoffeeCup purchases to the total purchase 46 | * 47 | * @param cups 48 | */ 49 | public void addCups(List cups) { 50 | for (CoffeeCup c : cups) { 51 | cupsPurchased.add(c); 52 | } 53 | } 54 | 55 | /** 56 | * Add a bag of coffee to the purchase 57 | * 58 | * @param coffeeType 59 | * @param weight 60 | */ 61 | public void addBag(CoffeeType coffeeType, double weight) { 62 | Bag bag = new CoffeeBag(coffeeType, weight); 63 | bagsPurchased.add(bag); 64 | } 65 | 66 | /** 67 | * Add a list of CoffeeBag to purchase 68 | * 69 | * @param bags 70 | */ 71 | public void addBags(List bags) { 72 | for (CoffeeBag bag : bags) { 73 | bagsPurchased.add(bag); 74 | } 75 | } 76 | 77 | /** 78 | * Add a list of CoffeeSaleType objects to the purchase This List can 79 | * consist of either bags or cups 80 | * 81 | * @param 82 | * @param saleList 83 | */ 84 | public void addToPurchase(List saleList) { 85 | for (CoffeeSaleType sale : saleList) { 86 | purchase.add(sale); 87 | } 88 | } 89 | 90 | /** 91 | * A utility function to add all cups and bags purchased to the purchase 92 | * list, and print out some useful labels. 93 | */ 94 | public void checkout() { 95 | System.out.println("Cups Purchased"); 96 | printPurchase(cupsPurchased); 97 | addToPurchase(cupsPurchased); 98 | System.out.println("Bags Purchased"); 99 | printPurchase(bagsPurchased); 100 | addToPurchase(bagsPurchased); 101 | // Print out coffee strength summary 102 | sortByCoffeeStrength(purchase); 103 | } 104 | 105 | /** 106 | * Prints the purchase out. Accepts Lists of CoffeeSaleType objects (bags or 107 | * cups). 108 | * 109 | * @param input 110 | */ 111 | private void printPurchase(List input) { 112 | for (CoffeeSaleType element : input) { 113 | System.out.println(element.getType()); 114 | } 115 | } 116 | 117 | /** 118 | * Returns the number of purchase of type T. This method uses a stream on 119 | * the purchase list, then filters upon the specified CoffeeType, and finally 120 | * returns a count 121 | * 122 | * @param 123 | * @param coffeeType 124 | * @return 125 | */ 126 | public long countTypes(T coffeeType) { 127 | long count = purchase.stream().filter( 128 | (sale) -> (sale.getType().getType().equals(coffeeType))) 129 | .count(); 130 | return count; 131 | } 132 | 133 | /** 134 | * This method accepts a purchase list (List of CoffeeSaleTypes), and extracts 135 | * the individual CoffeeType from each element within the purchase list. It 136 | * then determines if the CoffeeType is an instance of Dark, Medium, or Light, 137 | * and places it into the appropriate container. 138 | * @param coffeeSale 139 | */ 140 | public void sortByCoffeeStrength(List coffeeSale) { 141 | for (CoffeeSaleType saleType : coffeeSale) { 142 | CoffeeType coffeeType = saleType.getType(); 143 | if (coffeeType instanceof Dark) { 144 | // Note that a cast is required, since darkTypes only accepts 145 | // Dark type objects 146 | darkTypes.add((Dark) coffeeType); 147 | } else if (coffeeType instanceof Medium) { 148 | // Note that no cast is required, since mediumTypes accepts 149 | // any CoffeeType object 150 | mediumTypes.add(coffeeType); 151 | } else if (coffeeType instanceof Light) { 152 | lightTypes.add((Light) coffeeType); 153 | } 154 | } 155 | 156 | System.out.println("Number of Dark Types: " + darkTypes.size()); 157 | System.out.println("Number of Medium Types: " + mediumTypes.size()); 158 | System.out.println("Number of Light Types: " + lightTypes.size()); 159 | 160 | } 161 | } 162 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/JavaHouseVisit.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package org.javase.genericsexamples.coffeehouse; 4 | 5 | import java.util.ArrayList; 6 | import java.util.List; 7 | import java.util.function.Predicate; 8 | 9 | /** 10 | * 11 | * @author Juneau 12 | */ 13 | public class JavaHouseVisit { 14 | public static void main(String[] args){ 15 | JavaHouse javaHouse = new JavaHouse(); 16 | javaHouse.addCup(new ItalianRoast(), 12); 17 | javaHouse.addCup(new FrenchRoast(), 16); 18 | javaHouse.addBag(new ItalianRoast(), 12); 19 | javaHouse.addBag(new DoughnutRoast(), 6); 20 | //javaHouse.addCup(new Integer(3), 3); Not a CoffeeType, so does not compile 21 | javaHouse.checkout(); 22 | 23 | // Retrieve the current purchase list 24 | List purchaseList = javaHouse.getCurrentPurchase(); 25 | System.out.println("Number of items in purchase: " + purchaseList.size()); 26 | 27 | // Print some further details on the purchased types to learn what our 28 | // customer enjoys 29 | purchaseList.stream().forEach((coffeeSale) -> { 30 | System.out.println(coffeeSale.getType().getType() + " Description - " + 31 | coffeeSale.getType().getDescription()); 32 | }); 33 | 34 | // How many of the ItalianRoast are contained in this purchase 35 | System.out.println("Number of Italian Roasts: " + 36 | javaHouse.countTypes(ItalianRoast.class)); 37 | 38 | List coffeeList = new ArrayList(); 39 | coffeeList.add(new DoughnutRoast()); 40 | coffeeList.add(new FrenchRoast()); 41 | coffeeList.add(new HouseBlend()); 42 | coffeeList.add(new ItalianRoast()); 43 | 44 | // Print the coffees that match the criteria 45 | System.out.println("Whole Bean"); 46 | compareCoffee(coffeeList, (n)->n.getDescription().contains(CoffeeType.WHOLE_BEAN)); 47 | System.out.println("Aromatic"); 48 | compareCoffee(coffeeList, (n)->n.getDescription().contains(CoffeeType.AROMATIC)); 49 | System.out.println("Ground"); 50 | compareCoffee(coffeeList, (n)->n.getDescription().contains(CoffeeType.GROUND)); 51 | 52 | } 53 | 54 | /** 55 | * Compare two types of coffee 56 | * @param list 57 | * @param predicate 58 | */ 59 | public static void compareCoffee(List list, Predicate predicate) { 60 | list.stream().filter((n) -> (predicate.test(n))).forEach((n) -> { 61 | System.out.println(n + " "); 62 | }); 63 | } 64 | } 65 | 66 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/Light.java: -------------------------------------------------------------------------------- 1 | /* 2 | * To change this license header, choose License Headers in Project Properties. 3 | * To change this template file, choose Tools | Templates 4 | * and open the template in the editor. 5 | */ 6 | 7 | package org.javase.genericsexamples.coffeehouse; 8 | 9 | /** 10 | * 11 | * @author Juneau 12 | */ 13 | public interface Light { 14 | 15 | } 16 | -------------------------------------------------------------------------------- /src/org/javase/genericsexamples/coffeehouse/Medium.java: -------------------------------------------------------------------------------- 1 | /* 2 | * To change this license header, choose License Headers in Project Properties. 3 | * To change this template file, choose Tools | Templates 4 | * and open the template in the editor. 5 | */ 6 | 7 | package org.javase.genericsexamples.coffeehouse; 8 | 9 | /** 10 | * 11 | * @author Juneau 12 | */ 13 | public interface Medium { 14 | 15 | } 16 | --------------------------------------------------------------------------------