java class

1public class Lightsaber {
2  // properties
3  private boolean isOn;
4  private Color color;
5  
6  // constructor
7  public Lightsaber(Color color) {
8    this.isOn = false;
9    this.color = color;
10  }
11  
12  // getters
13  public Color getColor() {
14    return color;
15  }
16  public boolean getOnStatus() {
17    return isOn;
18  }
19  
20  // setters
21  public void turnOn() {
22    isOn = true;
23  }
24  public void turnOff() {
25    isOn = false;
26  }
27}
28
29
30
31// Implementation in main method:
32public class test {
33  public static void main(String[] args) {
34    Lightsaber yoda = new Lightsaber(green);
35    yoda.turnOn();
36  }
37}
38    

1// this might help you understand how classes work
2public class MathTest {
3
4    public static void main(String[] args) {
5
6        class MathAdd {
7
8            int num1;
9            int num2;
10
11            public int addNumbers() {
12
13                int addThemUp = num1 + num2;
14                return addThemUp;
15            }
16        }
17
18        MathAdd addition = new MathAdd(); // create a new instance of the class
19
20        // you can access variables from the class 
21        addition.num1 = 10; 
22        addition.num2 = 20;
23
24        // and use the method from the class to add them up
25        System.out.println(addition.addNumbers());
26
27    }
28}

1
2public class HelloWorld {
3  public static void main(String[] args) {
4    
5    // how to use class in java
6    class User{
7    	
8    	int score;
9    }
10    
11    User dave = new User();
12    
13    dave.score = 20;
14    
15    System.out.println(dave.score);
16    
17 
18  }
19}
20

1Class is a blueprint or template which
2you can create as many objects as you 
3like. Object is a member or instance
4of a class.
5Class is declared using class keyword,
6Object is created through
7new keyword mainly. A class is a template
8  for objects. A class defines 
9object properties including a valid range
10    of values, and a default value. 
11A class also describes object behavior.

1//	Example : TestClass (Can be predefined or user-defined)
2public class TestClass {
3  // properties
4  private int id = 111;
5  
6  // constructor
7  public TestClass(){
8    super();
9  }
10  
11  // method
12  public void test(){
13    // some code here
14  }
15}

1abstract class Pesan {
2   public void success() {
3     System.out.println("Mobil Berhasil Dibeli");
4   }
5   
6   public void error() {
7     System.out.println("Uang Anda Tidak Cukup");
8   }
9}
10 
11class Car extends Pesan {
12    protected String nama = "toyota supra";
13    protected String warna = "merah";
14    protected int harga = 2000000000;
15    protected String brand = "toyota";
16}
17 
18class ShowRoom extends Car {
19  protected String namaShowroom = "Catur Sentosa Raya";
20  protected String alamatShowroom = "Jl.siliwangin kec pancoranmas kota depok 16436";
21}
22 
23class Pembeli extends ShowRoom {
24    protected String namaPembeli = "anto jayabaya";
25    protected String alamatPembeli = "jl.swadaya rt.01/rw.04 no.112 kec pancoranmas kota depok";
26    protected int saldoPembeli = 50000000;
27}
28 
29class BeliMobil extends Pembeli {
30 
31 public BeliMobil(String nama, String warna, int harga, String brand, String nsr, String asr, String np, String ap, int sdp) {
32    super();
33    
34    super.nama = nama;
35    super.warna = warna;
36    super.harga = harga;
37    super.brand = brand;
38    super.namaShowroom = nsr;
39    super.alamatShowroom = asr;
40    super.namaPembeli = np;
41    super.alamatPembeli = ap;
42    super.saldoPembeli = sdp;
43 }
44    
45void getResult(String nama, String warna, int harga, String brand, String np, String ap) {
46    
47     if(super.harga > super.saldoPembeli) {
48       System.out.println("=======================");
49       super.error();
50       System.out.println("=======================");
51     } else {
52       System.out.println("=======================");
53       super.success();
54       System.out.println("=======================");
55       System.out.println("");
56       System.out.println("=======================");
57       System.out.println("Jenis Mobil");
58       System.out.println("=======================");
59       System.out.println("");
60       System.out.println("Nama Mobil:" + nama);
61       System.out.println("Warna Mobil:" + warna);
62       System.out.println("Harga Mobil:" + harga);
63       System.out.println("Brand Mobil:" + brand);
64       System.out.println("");
65       System.out.println("=======================");
66       System.out.println("Nama Pembeli Mobil");
67       System.out.println("=======================");
68       System.out.println("Nama Pembeli:" + np);
69       System.out.println("Nama Pembeli:" + ap);
70     }
71  }
72    
73 public static void main(String[] args) {
74   BeliMobil beli = new BeliMobil("avanza", "hitam", 128000000, "toyota", "Jaya Mobil", "Jakarta", "Anton", "Depok", 228000000);
75   beli.getResult(beli.nama, beli.warna, beli.harga, beli.brand, beli.namaPembeli, beli.alamatPembeli);
76  }
77}
78