why setXXX() method is not overrinding?

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You are creating two independent objects.

First you create an object and name it santhosh. This object is referenced by the obj variable.

pojo obj = new pojo();
obj.setName("santhosh");

Then you create a second object, which is referenced by the exObj variable.

ExtendPojo exObj = new ExtendPojo();

It doesn’t have a name yet, since it’s a new object and you haven’t assigned the name. You then give it a name.

exObj.setName("mahesh");//It is not overriding

Now you print the name of the first object, which hasn’t changed.

System.out.println(obj.getName());//it prints santhosh.

The code is doing exactly what you asked it to do.

If you intended the two variables to reference the same object, you’d do this:

ExtendPojo exObj = new ExtendPojo();

pojo obj = exObj ;//Same object, new variable, different type
obj.setName("santhosh");

exObj.setName("mahesh");//It is working now

System.out.println(obj.getName());//it prints mahesh.

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