java inheritance

1Inheritance in Java is a mechanism in which one object acquires 
2all the properties and behaviors of a parent object.
3It is an important part of OOPs (Object Oriented programming system).

1// super class
2class Animal
3{
4   void eat()
5   {
6      System.out.println("Animal is eating.");
7   }
8}
9// subclass
10class Lion extends Animal
11{
12   public static void main(String[] args)
13   {
14      Lion obj = new Lion();
15      obj.eat();
16   }
17}

1// Multiple inheritance in java
2interface M
3{
4   public void helloWorld();
5}
6interface N
7{
8   public void helloWorld();
9}
10// implementing interfaces
11public class MultipleInheritanceExample implements M, N
12{
13   public void helloWorld()
14   {
15      System.out.println("helloWorld() method");
16   }
17   public static void main(String[] args) 
18   {
19      MultipleInheritanceExample obj = new MultipleInheritanceExample();
20      obj.helloWorld();
21   }
22}

1public class Bicycle {
2        
3    // the Bicycle class has three fields
4    public int cadence;
5    public int gear;
6    public int speed;
7        
8    // the Bicycle class has one constructor
9    public Bicycle(int startCadence, int startSpeed, int startGear) {
10        gear = startGear;
11        cadence = startCadence;
12        speed = startSpeed;
13    }
14        
15    // the Bicycle class has four methods
16    public void setCadence(int newValue) {
17        cadence = newValue;
18    }
19        
20    public void setGear(int newValue) {
21        gear = newValue;
22    }
23        
24    public void applyBrake(int decrement) {
25        speed -= decrement;
26    }
27        
28    public void speedUp(int increment) {
29        speed += increment;
30    }
31        
32}
33

1// single inheritance example
2import java.util.*;
3class Animal
4{
5   void eat()
6   {
7      System.out.println("Animal is eating.");
8   }
9}
10class Lion extends Animal
11{
12   void roar()
13   {
14      System.out.println("lion is roaring.");
15   }
16   public static void main(String[] args)
17   {
18      Lion obj = new Lion();
19      obj.eat();
20      obj.roar();
21   }
22}

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