Comparing Class Types in Java

Question

I want to compare the class type in Java.

I thought I could do this:

class MyObject_1 {}
class MyObject_2 extends MyObject_1 {}

public boolean funct         


        

Answer 1

If you had two Strings and compared them using == by calling the getClass() method on them, it would return true. What you get is a reference on the same object.

This is because they are both references on the same class object. This is true for all classes in a java application. Java only loads the class once, so you have only one instance of a given class at a given time.

String hello  = "Hello";
String world = "world";

if (hello.getClass() == world.getClass()) {
    System.out.println("true");
} // prints true