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  1.  
  2. // Encapsulation : binding varibles and method into single class . 
  3. class Company{
  4.   private String name; 
  5.   private int id;
  6.  
  7.   public Company(String EmpName, int Empid){
  8.       name=EmpName;
  9.       id=Empid;
  10.   }
  11.  
  12.   public String getName(){
  13.       return name;
  14.   }
  15.  
  16.    public int getID(){
  17.       return id;
  18.   }
  19.  
  20.      void setID(int Empid){
  21.         id=Empid;
  22.   }
  23. };
  24.  
  25.  
  26. //inheritdance : inheriting the behaviour of base class 
  27.  
  28. class Animal{
  29.  
  30.      void food(){
  31.         System.out.println("Anu food");
  32.     }
  33. };
  34. class Cat extends Animal{
  35.         void catFood(){
  36.         System.out.println("cat food");
  37.     }
  38.  
  39. };
  40.  
  41.  
  42. //Compile time polymorphism 
  43. class compiletime{
  44.      void sum(int a , int b){
  45.         System.out.println( a+b);
  46.     }
  47.       void  sum(double a , double b){
  48.         System.out.println (a+b);
  49.     }
  50.  
  51. }
  52.  
  53. // run time polymorphism
  54.  
  55. class math{
  56.      void sum(int a , int b){
  57.         System.out.println( a+b);
  58.     }
  59. }
  60.  
  61. class cal extends math{
  62.     @Override
  63.      void sum(int a , int b){
  64.         System.out.println(a*b);
  65.     }
  66. }
  67.  
  68. // Abstraction : hiding complex implementation details and exposing only the essential features 
  69.  
  70. // Abstraction is achieved using:Abstract classes:
  71.  
  72. abstract class Animalpark{
  73.     abstract void food();
  74. }
  75.  
  76. class dog extends Animalpark{
  77.     void food(){
  78.         System.out.println("Dog food");
  79.     }
  80. }
  81.  
  82. class cat extends Animalpark{
  83.     void food(){
  84.         System.out.println("cat food");
  85.     }
  86. }
  87.  
  88. public class Main
  89. {
  90. 	public static void main(String[] args) {
  91.         // 1.
  92.         // Company  com = new Company("Aman",1);
  93.         // com.setID(123);
  94.         // System.out.println(com.getName()+" "+com.getID());
  95.         // 2. 
  96.         // Cat ani= new Cat();
  97.         // ani.catFood();
  98.         // ani.food();
  99.  
  100.         // 3.
  101.         // compiletime ct= new compiletime();
  102.         // ct.sum(1,2);
  103.         // ct.sum(1.2,2.3);
  104.  
  105.         // 4. 
  106.         // cal s=new cal();
  107.         // s.sum(1,2);
  108.  
  109.         // 5.
  110.         // cat a1=new cat();
  111.         // a1.food();
  112.  
  113.         // dog b1=new dog();
  114.         // b1.food();
  115. 	}
  116. }
  117.  
Success #stdin #stdout 0.08s 54624KB
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https://ideone.com/QxTS6T
language:
Java (HotSpot 12)
created:
14 days ago
visibility:
public

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