extraguidemo3.java

JAVA程序设计课程中各章节的程序实例。

/**???
*Another menu demonstration program
*You need the following steps to create a menu:
*1.Create an instance of the MenuBar() class
*---MenuBar mb = new MenuBar();
*2.Attach it to the Frame using the setMenuBar();
*---frame.setMenuBar(mb);
*3.To create a popup,create an instance of Menu class;
*---Menu m = new Menu("background");
*4.Add the popup to the MenuBar using add();
*---mb.add(m);
*5.Create and add menu items to the popup using add() and MenuItem();
*---m.add(new MenuItem("default"));
*6.To have seperators,use addSeperator();
*7.To disable or enable any menu item,use disable() or enable();
*2005.1.11. xhcprince
*/

import java.awt.*;

class estraGUIDemo3 extends Frame
{
	MenuBar mb = new MenuBar();
	Menu m1 = new Menu("Main");
	Menu m2 = new Menu("Quit");
	MenuItem mi1 = new MenuItem("Step1");
	MenuItem mi2 = new MenuItem("Step2");
	MenuItem mi3 = new MenuItem("Step3");
	
	public static void main(String args[])
	{
		extraGUIDemo3 obj = new extraGUIDemo3();
		
		obj.lays();
	}

	public void lays()
	{
		super("A java menu class");
		setMenuBar(mb);
		
		mb.add(m1);
		mb.add(m2);
		
		m1.addSeperator();
		m1.add(mi1);
		m1.add(mi2);
		m1.add(mi3);
		m1.setSeperator();
		
		setSize(320,240);
		setVisible(true);		
	}	
}