simpleframe2.java

设着窗体的例子。将框架显示在屏幕正中。定义菜单

import javax.swing.*;
import java.awt.*;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;

public class SimpleFrame2  extends JFrame{

    public SimpleFrame2(int width,int height) {
		    JMenuBar menubar;
    		JMenu menu;
    		JMenuItem  item1,item2; 

        setSize(width,height);//设置框架大小
        setTitle("Frame主窗体");//设置框架标题

        //将框架显示在屏幕正中
        Toolkit kit= Toolkit.getDefaultToolkit();
        Dimension screenSize=kit.getScreenSize();
        int x=(screenSize.width-width)/2;
        int y=(screenSize.height-height)/2;
        setLocation(x,y);//设置框架位置
        
        //定义菜单
	      menubar=new JMenuBar(); 
	      menu=new JMenu("文件");   
	      item1=new JMenuItem("打开",new ImageIcon("open.gif"));
	      item2=new JMenuItem("保存");
	      //设置快捷键
	      item1.setAccelerator(KeyStroke.getKeyStroke('O'));  
	      item2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
	      menu.add(item1);
	      menu.addSeparator();
	      menu.add(item2);
	      menubar.add(menu);
	      setJMenuBar(menubar);

        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }

    public static void main(String args[]) {
        SimpleFrame2 frame=new SimpleFrame2(400,300);
    }
}