Answer to Interview Question

[Mike Gershman]

To whoever posted the interview question:

You wanted to call Test.meth() without using another reference and without changing the signatures.

One response was to use reflection.

Here is another.

I wonder if there is a third answer ...

class Test
{
    void meth()
    {
        System.out.println( "You r in Test" );
    }
}
 
class Test1 extends Test
{
    void meth()
    {
        System.out.println(" Now u r in Test1" );
    }
}
 
class DTest
{
    public static void main( String str[] )
    {
        Test1 t1 = new Test1();
        t1.meth(); //here definatly Test1's method is call
 
        // now how should here i call Test's Method?
        // Please give me solution. 
        new Test().meth();  //<<<<<<<<<<< solution
 
    }
} 

[Vincent Wong]

Why donot you use polymorphism here??just like this:
Test t=new Test();
t.meth(); //call the method in super class
t=new Test1();
t.meth(); //call the method in sub-class

just my own opinion

[Marilyn de Queiroz]

The original question stated that you could not create a reference to the Test class.

[Mike Gershman]

The original question said:

Here how should i call Test's method without using referance
& also the function of both should be same means (return type & parameters both should same)

I took "without using reference" literally and I didn't use t1, the only reference provided.

Of course, any method invocation involves some sort of reference, but my solution did not create a reference variable.

If you take "without using reference" to mean without creating a new reference and you take "the function of both should be same means (return type & parameters both should same)" to mean that you can't change classes Test and Test1, then I think the problem is unsolvable.

We could further discuss what the interviewer quoted by the the interviewee really meant, but that's not a Java discussion.