Question

public void testFunc(Object o) {
     System.out.println("testFunc-Object");
}

public void testFunc(String s) {
     System.out.println("testFunc-String");
}

Both of these methods are in test class. If I invoke the following method from main method of test class, which method will be invoked?

Test t = new Test();
t.testFunc(null);

In this particular scenario, testFunc(String) is called, but why?
I would appreciate your help.

Answer 1

testFunc(String s) gets invoked because the runtime will choose the variant of testFunc with the most specific argument. testFunc(String s) is more specific than testFunc(Object o) because String is a subtype of Object.

Peruse section 15.12.2.5 of the JLS for explicit details.