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Objects and Collections - Programming

Q1:

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()); 
}

A 42

B Runtime Exception

C Compile Error at line 2

D Compile Error at line 5

ANS:A - 42

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()