系统管理主菜单运行界面02

import java.awt.Dimension; 
import java.awt.GridLayout; 
import java.awt.Toolkit; 
import java.awt.event.*;

import javax.swing.JButton; 
import javax.swing.JFrame;

public class mainframe { 
static final int WIDTH = 400; 
static final int HEIGHT = 200; 
//JFrame buttonframe; 
public mainframe(){ 
JFrame buttonframe = new JFrame(“学校信息管理系统”); 
//buttonframe.setTitle(“学校信息管理系统”); 
buttonframe .setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
buttonframe.setSize(WIDTH, HEIGHT); 
Toolkit kit = Toolkit.getDefaultToolkit(); 
//获取屏幕的大小对象 
Dimension screenSize = kit.getScreenSize(); 
int width = screenSize.width; 
int height = screenSize.height; 
int x = (width-WIDTH)/2; 
int y = (height - HEIGHT)/2; 
buttonframe.setLocation(x, y); 
buttonframe.setVisible(true);

    JButton student = new JButton("学生信息系统模块");
    JButton teacher = new JButton("教师信息系统模块");
    JButton leader  = new JButton("领导信息系统模块");

    buttonframe.add(student);
    buttonframe.add(teacher);
    buttonframe.add(leader);

    buttonframe.setLayout(new GridLayout(3, 1));

    student.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent Event){
            studentmanageframe studentframe = new studentmanageframe();

        }
    });
    teacher.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent Event){
            teachermanageframe teacherframe = new teachermangerframe();

        }
    });

    leader.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent Event){
            leadermanageframe leaderframe = new leadermanageframe();

        }
    });
}
}