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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.text.MessageFormat;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static class A {
  12. 		public final int a;
  13.  
  14. 		public A() {
  15. 			this.a = 0;
  16. 			System.out.println(
  17. 					MessageFormat.format("new A() constructor is called to create an instance of {0}.",
  18. 					getClass().getName()));
  19. 		}
  20.  
  21. 		public A(int a) {
  22. 			this.a = a;
  23. 			System.out.println(
  24. 					MessageFormat.format("new A(int) constructor is called to create an instance of {0}.", 
  25. 			        getClass().getName()));
  26. 		}
  27. 	}
  28.  
  29. 	public static class B extends A implements Serializable {
  30. 		public final int b;
  31.  
  32. 		public B(int a, int b) {
  33. 			super(a);
  34. 			this.b = b;
  35. 			System.out.println(
  36. 					MessageFormat.format("new B(int, int) constructor is called to create an instance of {0}.",
  37. 					getClass().getName()));
  38. 		}
  39.  
  40. 		@Override
  41. 		public String toString() {
  42. 			return "B [a=" + a + ", b=" + b + "]";
  43. 		}
  44.  
  45.  
  46. 	}
  47.  
  48. 	public static void main (String[] args) throws java.lang.Exception
  49. 	{
  50. 		B b1 = new B(10,20);
  51.  
  52.         System.out.println(b1);
  53.  
  54.         ByteArrayOutputStream bos = new ByteArrayOutputStream();
  55.         try(ObjectOutputStream oos = new ObjectOutputStream(bos)) {
  56.             oos.writeObject(b1);
  57.         }
  58.  
  59.         ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
  60.         try (ObjectInputStream ois = new ObjectInputStream(bis)) {
  61.             B b2 = (B)ois.readObject();
  62.             System.out.println(b2);
  63.         }
  64. 	}
  65. }
Success #stdin #stdout 0.22s 34528KB
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Standard input is empty
stdout
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new A(int) constructor is called to create an instance of Ideone$B.
new B(int, int) constructor is called to create an instance of Ideone$B.
B [a=10, b=20]
new A() constructor is called to create an instance of Ideone$B.
B [a=0, b=20]
https://ideone.com/KGJp7P
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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