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Discussion :: Inner Classes

  1. What will be the output of the program?

       public class Foo
   {   
      Foo()   
     {     
        System.out.print("foo");   
     }    
    
 class Bar 
 {    
    Bar()   
   {       
       System.out.print("bar");   
   }  
   public void go() 
   {   
       System.out.print("hi");  
   }
 }  /* class Bar ends */  
  
 public static void main (String [] args)        
 {    
     Foo f = new Foo();         
     f.makeBar();   
 }    
 void makeBar()
 {      
    (new Bar() {}).go();   
 }
}/* class Foo ends */

     

    2. A.

    Compilation fails.
    B.

    An error occurs at runtime.
    C.

    It prints "foobarhi"
    D.

    It prints "barhi"

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    Answer : Option C

    Explanation :

    Option C is correct because first the Foo instance is created, which means the Foo constructor runs and prints "foo". Next, the makeBar() method is invoked which creates a Bar, which means the Bar constructor runs and prints "bar", and finally the go() method is invoked on the new Bar instance, which means the go() method prints "hi".

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