//讲原件添加到当前窗口当中

this.add(btnlong);

this.add(btnreset);

this.add(usertext);

this.add(passtext);

this.add(username);

this.add(password);

this.setVisible(true);

btnlong.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

checklogin();

}

});

btnreset.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

textclearn();

}

});

public void checklogin(){

String usern = username.getText();

String passw = password.getText();

if(usern.equals(“”) && passw.equals(“”) ){

JOptionPane.showMessageDialog(this, “用户名密码不正确”);

}

//设置当前窗口为不显示

this.setVisible(false);

//打开另外一个窗口

MainFrame mainFrame = new MainFrame();

}

public void textclearn(){

//清空对应文本框的内容

username.setText(“”);

password.setText(“”);

}

package com.itzheng.test;

import javax.swing.JFrame;

public class MainFrame extends JFrame {

public MainFrame(){

this.setSize(500, 700);

this.setVisible(true);

}

}