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neelam
Run time polymorphism
1 Answer(s)      3 years and 10 months ago
Posted in : Java Interview Questions


What is run time polymorphism or dynamic method dispatch?

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October 19, 2010 at 3:22 PM


Hi,

Here is the answer.

In Java, runtime polymorphism or dynamic method dispatch is a process in which a call to an overridden method is resolved at runtime rather than at compile-time.

In this process, an overridden method is called through the reference variable of a superclass. The determination of the method to be called is based on the object being referred to by the reference variable.

Example-

class Test {
    void show() {
        System.out.println("A Beautiful flower.");
    }
}

class Rose extends Test {
    void show() {
        System.out.println("pink");
    }
}

class Lotus extends Test {
    void show() {
        System.out.println("rose.");
    }
}

public class RunTime {
    public static void main(String[] args) {
        Test ref1 = new Test();
        Test ref2 = new Rose();
        Test ref3 = new Lotus();
        ref1.show();
        ref2.show();
        ref3.show();

    }
}

Output-

A Beautiful flower.
pink
rose.

Thanks.



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