Learn Java for Web Development

APPENDIX A: Introduction to Java 395

Now the code of ClassB looks like that shown in Listing A-20.

Listing A-20. Overriding methodA( )

package apress.appendix_A;

public class ClassB extends ClassA {

public void methodA() {
System.out.println("methodA() in ClassB");
}

}

Now both ClassA and ClassB have the same method, methodA().

The following assignment:

ClassA var1 = new ClassB();

confirms that it is possible to call methodA( ) on var1 because ClassA has methodA( ). So, the following
test will compile:

package apress.appendix_A;

public class Test {
public static void main(String[] args) {

ClassA var1 = new ClassB();
var1.methodA();

}
}

Figure A-3. Overriding a method