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Discussion :: Objects and Collections

  1. What will be the output of the program?

     public static void main(String[] args) 
 {   
   Object obj = new Object()   
   {      
     public int hashCode()   
       {           
         return 42;      
       }    
   };     
    System.out.println(obj.hashCode()); 
 }

    2. A.

    42
    B.

    Runtime Exception
    C.

    Compile Error at line 2
    D.

    Compile Error at line 5

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    Answer : Option A

    Explanation :

    This code is an example of an anonymous inner class. They can be declared to extend another class or implement a single interface. Since they have no name you can not use the "new" keyword on them.

    In this case the annoynous class is extending the Object class. Within the {} you place the methods you want for that class. After this class has been declared its methods can be used by that object in the usual way e.g. objectname.annoymousClassMethod()

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