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Discussion :: Language Fundamentals

  1. What will be the output of the program?

     public class TestDogs  
 {   
    public static void main(String [] args)        
    {
       Dog [][] theDogs = new Dog[3][];         
       System.out.println(theDogs[2][0].toString());    
    } 
}
 class Dog { }

    2. A.

    null
    B.

    theDogs
    C.

    Compilation fails
    D.

    An exception is thrown at runtime

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    Answer : Option D

    Explanation :

    The second dimension of the array referenced by theDogs has not been initialized. Attempting to access an uninitialized object element (System.out.println(theDogs[2][0].toString());) raises a NullPointerException.

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