├── .gitignore
├── .idea
    ├── .gitignore
    ├── misc.xml
    └── modules.xml
├── application.properties
├── belajar-java-standard-classes.iml
├── name.properties
└── src
    └── programmer
        └── zaman
            └── now
                └── classes
                    ├── ArraysApp.java
                    ├── Base64App.java
                    ├── BigNumberApp.java
                    ├── DateApp.java
                    ├── MathApp.java
                    ├── NumberApp.java
                    ├── ObjectsApp.java
                    ├── PropertiesApp.java
                    ├── RandomApp.java
                    ├── RegexApp.java
                    ├── RuntimeApp.java
                    ├── ScannerApp.java
                    ├── StringApp.java
                    ├── StringBuilderApp.java
                    ├── StringJoinerApp.java
                    ├── StringTokenizerApp.java
                    ├── SystemApp.java
                    └── UUIDApp.java


/.gitignore:
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1 | out


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/.idea/.gitignore:
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1 | # Default ignored files
2 | /shelf/
3 | /workspace.xml
4 | # Datasource local storage ignored files
5 | /dataSources/
6 | /dataSources.local.xml
7 | # Editor-based HTTP Client requests
8 | /httpRequests/
9 | 


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/.idea/misc.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="ProjectRootManager" version="2" languageLevel="JDK_15" default="true" project-jdk-name="15" project-jdk-type="JavaSDK">
4 |     <output url="file://$PROJECT_DIR$/out" />
5 |   </component>
6 | </project>


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/.idea/modules.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="ProjectModuleManager">
4 |     <modules>
5 |       <module fileurl="file://$PROJECT_DIR$/belajar-java-standard-classes.iml" filepath="$PROJECT_DIR$/belajar-java-standard-classes.iml" />
6 |     </modules>
7 |   </component>
8 | </project>


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/application.properties:
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1 | database.host=localhost
2 | database.port=9999
3 | database.username=rahasia
4 | database.password=rahasia


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/belajar-java-standard-classes.iml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <module type="JAVA_MODULE" version="4">
 3 |   <component name="NewModuleRootManager" inherit-compiler-output="true">
 4 |     <exclude-output />
 5 |     <content url="file://$MODULE_DIR$">
 6 |       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
 7 |     </content>
 8 |     <orderEntry type="inheritedJdk" />
 9 |     <orderEntry type="sourceFolder" forTests="false" />
10 |   </component>
11 | </module>


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/name.properties:
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1 | #Konfigurasi Nama
2 | #Sat Oct 17 14:28:15 WIB 2020
3 | name.middle=Kurniawan
4 | name.first=Eko
5 | name.last=Khannedy
6 | 


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/src/programmer/zaman/now/classes/ArraysApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Arrays;
 4 | 
 5 | public class ArraysApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     int[] numbers = {
 9 |         1, 4, 234, 5, 6, 19, 5, 67, 4, 5, 67, 4, 6, 7
10 |     };
11 | 
12 |     Arrays.sort(numbers);
13 | 
14 |     System.out.println(Arrays.toString(numbers));
15 | 
16 |     System.out.println(Arrays.binarySearch(numbers, 7));
17 |     System.out.println(Arrays.binarySearch(numbers, 234));
18 |     System.out.println(Arrays.binarySearch(numbers, 100));
19 | 
20 |     int[] result = Arrays.copyOf(numbers, 5);
21 |     System.out.println(Arrays.toString(result));
22 | 
23 |     int[] result2 = Arrays.copyOfRange(numbers, 5, 10);
24 |     System.out.println(Arrays.toString(result2));
25 | 
26 |   }
27 | }
28 | 


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/src/programmer/zaman/now/classes/Base64App.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Base64;
 4 | 
 5 | public class Base64App {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     String original = "Eko Kurniawan Khannedy";
 9 | 
10 |     String encoded = Base64.getEncoder().encodeToString(original.getBytes());
11 |     System.out.println(encoded);
12 | 
13 |     byte[] bytes = Base64.getDecoder().decode(encoded);
14 |     String result = new String(bytes);
15 | 
16 |     System.out.println(result);
17 | 
18 |   }
19 | }
20 | 


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/src/programmer/zaman/now/classes/BigNumberApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.math.BigDecimal;
 4 | import java.math.BigInteger;
 5 | 
 6 | public class BigNumberApp {
 7 |   public static void main(String[] args) {
 8 | 
 9 |     BigInteger a = new BigInteger("10000000000000000000");
10 |     BigInteger b = new BigInteger("10000000000000000000");
11 | 
12 |     BigInteger c = a.add(b);
13 | 
14 |     System.out.println(c);
15 | 
16 |   }
17 | }
18 | 


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/src/programmer/zaman/now/classes/DateApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Calendar;
 4 | import java.util.Date;
 5 | 
 6 | public class DateApp {
 7 | 
 8 |   public static void main(String[] args) {
 9 | 
10 | 
11 |     Date tanggal = new Date(23587200000L);
12 | 
13 |     System.out.println(tanggal);
14 | 
15 |     Calendar calendar = Calendar.getInstance();
16 |     calendar.set(Calendar.YEAR, 2000);
17 |     calendar.set(Calendar.MONTH, Calendar.JANUARY);
18 |     calendar.set(Calendar.HOUR_OF_DAY, 10);
19 | 
20 |     Date result = calendar.getTime();
21 |     System.out.println(result);
22 | 
23 |   }
24 | 
25 | }
26 | 


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/src/programmer/zaman/now/classes/MathApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class MathApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 |     var min = Math.min(1000, 2000);
 7 |     System.out.println(min);
 8 | 
 9 |     var max = Math.max(1000, 2000);
10 |     System.out.println(max);
11 | 
12 |     System.out.println(Math.PI);
13 | 
14 |   }
15 | }
16 | 


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/src/programmer/zaman/now/classes/NumberApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class NumberApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 | 
 7 |     Integer intValue = 10;
 8 | 
 9 |     Long longValue = intValue.longValue();
10 |     Double doubleValue = longValue.doubleValue();
11 |     Short shortValue = doubleValue.shortValue();
12 | 
13 |     String contoh = "100.10";
14 | 
15 |     Double contohInt = Double.valueOf(contoh);
16 |     System.out.println(contohInt);
17 | 
18 |   }
19 | }
20 | 


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/src/programmer/zaman/now/classes/ObjectsApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Objects;
 4 | 
 5 | public class ObjectsApp {
 6 | 
 7 |   public static class Data {
 8 | 
 9 |     private String data;
10 | 
11 |     public Data(String data) {
12 |       this.data = data;
13 |     }
14 | 
15 |     public String getData() {
16 |       return data;
17 |     }
18 | 
19 |     public void setData(String data) {
20 |       this.data = data;
21 |     }
22 | 
23 |     @Override
24 |     public boolean equals(Object o) {
25 |       if (this == o) return true;
26 |       if (o == null || getClass() != o.getClass()) return false;
27 | 
28 |       Data data1 = (Data) o;
29 | 
30 |       return data != null ? data.equals(data1.data) : data1.data == null;
31 |     }
32 | 
33 |     @Override
34 |     public int hashCode() {
35 |       return data != null ? data.hashCode() : 0;
36 |     }
37 | 
38 |     @Override
39 |     public String toString() {
40 |       return "Data{" +
41 |           "data='" + data + '\'' +
42 |           '}';
43 |     }
44 |   }
45 | 
46 |   public static void main(String[] args) {
47 | 
48 |     execute(null);
49 | 
50 |   }
51 | 
52 |   public static void execute(Data data){
53 | 
54 | 
55 |       System.out.println(Objects.toString(data));
56 |       System.out.println(Objects.hashCode(data));
57 | 
58 |   }
59 | }
60 | 


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/src/programmer/zaman/now/classes/PropertiesApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.io.*;
 4 | import java.util.Properties;
 5 | 
 6 | public class PropertiesApp {
 7 |   public static void main(String[] args) {
 8 | 
 9 |     try {
10 |       Properties properties = new Properties();
11 |       properties.load(new FileInputStream("application.properties"));
12 | 
13 |       String host = properties.getProperty("database.host");
14 |       String port = properties.getProperty("database.port");
15 |       String username = properties.getProperty("database.username");
16 |       String password = properties.getProperty("database.password");
17 | 
18 |       System.out.println(host);
19 |       System.out.println(port);
20 |       System.out.println(username);
21 |       System.out.println(password);
22 | 
23 |     } catch (FileNotFoundException exception) {
24 |       System.out.println("File tidak ketemu");
25 |     } catch (IOException exception) {
26 |       System.out.println("Gagal load data dari file");
27 |     }
28 | 
29 | 
30 |     try {
31 |       Properties properties = new Properties();
32 |       properties.put("name.first", "Eko");
33 |       properties.put("name.middle", "Kurniawan");
34 |       properties.put("name.last", "Khannedy");
35 | 
36 |       properties.store(new FileOutputStream("name.properties"), "Konfigurasi Nama");
37 |     } catch (FileNotFoundException exception) {
38 |       System.out.println("Error membuat file properties");
39 |     } catch (IOException exception) {
40 |       System.out.println("Error menyimpan properties");
41 |     }
42 | 
43 |   }
44 | }
45 | 


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/src/programmer/zaman/now/classes/RandomApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Random;
 4 | 
 5 | public class RandomApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     Random random = new Random();
 9 | 
10 |     for (int i = 0; i < 1000; i++) {
11 |       int value = random.nextInt(1000);
12 |       System.out.println(value);
13 |     }
14 | 
15 |   }
16 | }
17 | 


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/src/programmer/zaman/now/classes/RegexApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.regex.Matcher;
 4 | import java.util.regex.Pattern;
 5 | 
 6 | public class RegexApp {
 7 |   public static void main(String[] args) {
 8 | 
 9 |     String name = "Eko Kurniawan Khannedy Programmer Zaman Now";
10 | 
11 |     Pattern pattern = Pattern.compile("[a-zA-Z]*[a][a-zA-Z]*");
12 |     Matcher matcher = pattern.matcher(name);
13 | 
14 |     while (matcher.find()){
15 |       String result = matcher.group();
16 |       System.out.println(result);
17 |     }
18 | 
19 |   }
20 | }
21 | 


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/src/programmer/zaman/now/classes/RuntimeApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class RuntimeApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 |     Runtime runtime = Runtime.getRuntime();
 7 | 
 8 |     System.out.println(runtime.availableProcessors());
 9 |     System.out.println(runtime.freeMemory());
10 |     System.out.println(runtime.totalMemory());
11 |     System.out.println(runtime.maxMemory());
12 | 
13 | 
14 |   }
15 | }
16 | 


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/src/programmer/zaman/now/classes/ScannerApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.Scanner;
 4 | 
 5 | public class ScannerApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     Scanner scanner = new Scanner(System.in);
 9 | 
10 |     System.out.print("Nama : ");
11 |     String name = scanner.nextLine();
12 | 
13 |     System.out.print("Umur : ");
14 |     Integer age = scanner.nextInt();
15 | 
16 |     System.out.println("Hello " + name + " umur anda adalah " + age);
17 |   }
18 | }
19 | 


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/src/programmer/zaman/now/classes/StringApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class StringApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 |     String name = "Eko Kurniawan Khannedy";
 7 |     String nameLowercase = name.toLowerCase();
 8 |     String nameUppercase = name.toUpperCase();
 9 | 
10 | 
11 |     System.out.println(name);
12 |     System.out.println(nameLowercase);
13 |     System.out.println(nameUppercase);
14 |     System.out.println(name.length());
15 |     System.out.println(name.startsWith("Eko"));
16 |     System.out.println(name.endsWith("Khannedy"));
17 | 
18 |     String[] names = name.split(" ");
19 |     for(var value : names){
20 |       System.out.println(value);
21 |     }
22 | 
23 |     System.out.println(" ".isBlank());
24 |     System.out.println(" ".isEmpty());
25 |     System.out.println("".isEmpty());
26 |     System.out.println(name.charAt(0));
27 | 
28 |     char[] chars = name.toCharArray();
29 | 
30 |   }
31 | }
32 | 


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/src/programmer/zaman/now/classes/StringBuilderApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class StringBuilderApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 |     StringBuilder builder = new StringBuilder();
 7 |     builder.append("Eko");
 8 |     builder.append(" ");
 9 |     builder.append("Kurniawan");
10 |     builder.append(" ");
11 |     builder.append("Khannedy");
12 | 
13 |     String name = builder.toString();
14 |     System.out.println(name);
15 | 
16 |   }
17 | }
18 | 


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/src/programmer/zaman/now/classes/StringJoinerApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.StringJoiner;
 4 | 
 5 | public class StringJoinerApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     StringJoiner joiner = new StringJoiner(", ", "{", "}");
 9 | 
10 |     joiner.add("Eko");
11 |     joiner.add("Kurniawan");
12 |     joiner.add("Khannedy");
13 | 
14 |     String value = joiner.toString();
15 |     System.out.println(value);
16 | 
17 |   }
18 | }
19 | 


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/src/programmer/zaman/now/classes/StringTokenizerApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.StringTokenizer;
 4 | 
 5 | public class StringTokenizerApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     String value = "Eko Kurniawan Khannedy";
 9 | 
10 |     StringTokenizer tokenizer = new StringTokenizer(value, " ");
11 | 
12 |     while(tokenizer.hasMoreTokens()){
13 |       String result = tokenizer.nextToken();
14 |       System.out.println(result);
15 |     }
16 | 
17 |   }
18 | }
19 | 


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/src/programmer/zaman/now/classes/SystemApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | public class SystemApp {
 4 |   public static void main(String[] args) {
 5 | 
 6 |     System.out.println(System.currentTimeMillis());
 7 |     System.out.println(System.nanoTime());
 8 | 
 9 |     System.out.println(System.getenv("HOME"));
10 |     System.out.println(System.getenv("APP"));
11 | 
12 |     System.gc();
13 | 
14 |     System.exit(1);
15 | 
16 |     System.out.println("Hi");
17 | 
18 |   }
19 | }
20 | 


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/src/programmer/zaman/now/classes/UUIDApp.java:
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 1 | package programmer.zaman.now.classes;
 2 | 
 3 | import java.util.UUID;
 4 | 
 5 | public class UUIDApp {
 6 |   public static void main(String[] args) {
 7 | 
 8 |     for(var i = 0; i < 100; i++){
 9 | 
10 |       UUID uuid = UUID.randomUUID();
11 |       String key = uuid.toString();
12 | 
13 |       System.out.println(key);
14 | 
15 |     }
16 | 
17 |   }
18 | }
19 | 


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