├── 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:
--------------------------------------------------------------------------------
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11 | Builds, tests, and runs the project GenericsExamples.
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--------------------------------------------------------------------------------
/manifest.mf:
--------------------------------------------------------------------------------
1 | Manifest-Version: 1.0
2 | X-COMMENT: Main-Class will be added automatically by build
3 |
4 |
--------------------------------------------------------------------------------
/nbproject/build-impl.xml:
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994 | To run this application from the command line without Ant, try:
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--------------------------------------------------------------------------------
/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 |
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/src/org/javase/genericsexamples/CalculatorExample.java:
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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 |
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/src/org/javase/genericsexamples/GenericContainer.java:
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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 |
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/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 |
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/src/org/javase/genericsexamples/GenericNumberContainerExamples.java:
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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 |
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/src/org/javase/genericsexamples/LambdaExample.java:
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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 |
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/src/org/javase/genericsexamples/MultiGenericContainer.java:
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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 |
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/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 |
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/src/org/javase/genericsexamples/ObjectContainer.java:
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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 |
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/src/org/javase/genericsexamples/ObjectExample.java:
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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 |
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/src/org/javase/genericsexamples/WildcardExample.java:
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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