What is the output of following program?

What is the output of following program?

1. package com.instanceofjava;
2.  
3. public class A{
4. 
   
5.  
6.  int GetValue()
7.  {
8.         return (true ? null : 0);
9.  }
10.  
11.  public static void main(String[] args)  {
12.  
13.    A obj= new A();
14. 
    
15.       obj.GetValue();
16.  
17.     }
18.  
19. }

 

1. Exception in thread "main" java.lang.NullPointerException

What is the output of following program?

What is the output of following program?

1. package com.instanceofjava;
2.  
3. public class A{
4. 
   
5.   
6.  public static void main(String[] args)  {
7.  
8.    Integer i1 = 128;
9.  
10.    Integer i2 = 128;
11.  
12.      System.out.println(i1 == i2);
13.  
14.    Integer i3 = 127;
15.    Integer i4 = 127;
16.  
17.       System.out.println(i3 == i4);
18.  
19.     }
20.  
21. }

 

1. false
2. true

What is the output of following program?

. What is the output of following program?

1. package com.instanceofjava;
2. class A
3. {
4.     
5. void method(int i)
6. {
7.  
8.  }
9.  
10.     }
11.  
12.  class B extends A
13.  {
14.  
15. @Override
16. void method(Integer i)
17.  {
18.  
19.  }
20.           
21. 
    
22. 
    
23. }

 

1. Compile time Error:The method method(Integer) of type B must override or implement a supertype method

Which line will throw compile time error? 8 or 9?

 Which line will throw compile time error? 8 or 9?

1. package com.instanceofjava;
2. class A
3. {
4.     
5. public static void main(String [] args)
6. {
7.  
8.   Integer i = new Integer(null);
9.   String s = new String(null);
10.  
11.  }
12.  
13. }

 

1. Compile time Error at line number 9:The constructor String(String) is ambiguous

System.out.println(null)

Program #1: what will happen when we print System.out.println(null)

Program #2: what will happen when we print System.out.println(null) by type casting
   

1. package com.systemoutprintn;
2. public class Test {
3.  
4.     /**
5.      * @Website: www.instanceofjava.com
6.      * @category: System.out.println(null)
7.      */
8.  
9. public static void main(String[] args) {
10.  
11.          System.out.println((String)null);//null
12.          System.out.println((Object)null);//null
13.          System.out.println((char[])null);
14.             
15.  
16. }
17.  
18. }

 Output:
  

1. null
2. null
3. Exception in thread "main" java.lang.NullPointerException
4.     at java.io.Writer.write(Unknown Source)
5.     at java.io.PrintStream.write(Unknown Source)
6.     at java.io.PrintStream.print(Unknown Source)
7.     at java.io.PrintStream.println(Unknown Source)
8.     at com.systemoutprintn.Test.main(Test.java:13)

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