Tuesday, May 18, 2010

SCJP Exam Watch 7 - Object Orientation (3)

Don't be fooled by a method that's overloaded but not overridden by a subclass. It's perfectly legal to do the following:

public class Foo {
    void doStuff() {}

class Bar extends Foo {
    void doStuff(String s) {}

The Bar class has two doStuff() methods: the no-arg version it inherits from Foo (and does not override), and the overloaded doStuff(String s) defined in the Bar class. Code with a refrence to a Foo can invoke only the no-arg version. but code with a reference to a Bar can invoke either of the overloaded versions.

Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)

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