Widening VS Auto Boxing during Overloading

Hi,

In this post we will see the usage of Over loading ,Boxing and widening concepts with an example.

Lets see how the above concepts are related with an example :

Example :-

public class WideningBoxing {

//Overloading example with boxing and widening

public void method(Integer x, Integer y)

{

System.out.println(" in Integer ");

}

public void method(float x, float y)

{

System.out.println("in float");

}

public static void main(String[] args) {

WideningBoxing wb=new WideningBoxing();

wb.method(1, 2);

}

}

Explanation :- Here we have two methods with same names,different parameter types.

We are calling this method from main .

Now the question is which method will be invoked when we call wb.method(1, 2);

The method with Integer or method with float parameters?

JVM will prefer to take widening than boxing here.

So the output will be

in float

The main reason behind this is widening was being implemented before auto boxing, so the API writers thought that the existing functionality should work same ,it should not be changed by adding new auto boxing feature.

This is the common Java interview Question

Note :- Widening is preferred than Boxing 

This is the key take away point from this post.

                     Happy Learning

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