simpleframe.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.*;

public class SimpleFrame  extends JFrame{

    public SimpleFrame(int width,int height) {

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

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