Is there another way to extends two classes?

Question

hi
I was wondering if anyone knows how to have one class to inherit two other classes methods?
I know that extending the main class with the two other classes are an invalid, just wondering is there another alternative to solve this problem?
Thank
J

Answer 1

I don't know the MHP class, but you could do the following:
if MHP.Button inherits feom awt.Button you may not have anything to do except change the constructor. You will be able to assign an MHP Button to an awt reference.
If MHP button is a truly seperate class, create an Interface with all the button methods you use. Then create a subclass of the MHP button which implements the interface and an awt subclass. Both these subclasses will be assignable to your interface reference.
I have done this with a button and JButton below. Of course this was not strictly necessary in this case because JButton extends from the awt Button class.
package package4;
import javax.swing.*;
import java.awt.*;
interface MyButton {
    // add ALL the rest of the methods you use!
    void setText(String txt);
    void show();
class myJButton extends JButton implements MyButton {
class myAWTButton extends Button implements MyButton {
    // AWTButton and JButton not quite compatible - call different function
    public void setText(String str) {
      setLabel(str);
public class Class2 extends Object {
   JFrame myframe ;
   MyButton button;
   JPanel jp;
  public Class2() {
    myframe = new JFrame() ;
    jp = new JPanel();
    myframe.setSize(500,500);
    myframe.setVisible(true);
    myframe.getContentPane().add(jp);
  void addJButton() {
    button = new myJButton();
    button.setText("DEFAULT");
    jp.add( (Component) button);
  void addAWTButton() {
    button = new myAWTButton();
    button.setText("DEFAULT");
     jp.add( (Component) button);
  void setButtonText(String str)
      button.setText(str);
  public static void main(String[] args) {
    Class2 awt = new Class2();
    awt.addAWTButton();
    awt.myframe.show();
    Class2 swing = new Class2();
    swing.addJButton();
    swing.myframe.setLocation(500,0);
    swing.myframe.show();
      // now we can use the same method on both
      swing.setButtonText("SWING!!!");
      awt.setButtonText("AWT!!!");
}In practice you would probably have a factory mettod to produce each type of button.