JMenuBar menuBar = new JMenuBar(); JMenu menuFile = new JMenu("File"); JMenu menuOperate = new JMenu("Operate"); JMenuItem loginMenuItem = new JMenuItem("Login",'L'); JMenuItem exitMenuItem = new JMenuItem("Exit",'E');
public MFrame() { //设置菜单 menuBar.add(menuFile); menuFile.add(loginMenuItem); menuFile.addSeparator(); menuFile.add(exitMenuItem); menuBar.add(menuOperate); this.setJMenuBar(menuBar);
public void addContral() { benter = new JButton("确定"); bcancel = new JButton("取消"); lname = new Label("请输入你的昵称"); lpassword = new Label("请输入你的密码"); tname = new JTextField(); tpassword = new JPasswordField(10); p = new JPanel(new GridLayout(3, 2)); c = this.getContentPane(); c.setLayout(new FlowLayout()); p.add(lname); p.add(tname); p.add(lpassword); p.add(tpassword); p.add(benter); p.add(bcancel); c.add(p); }
class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent event) { if(event.getSource()==benter) { JOptionPane.showMessageDialog(null,"登录成功!"); } else if(event.getSource()==bcancel) { System.exit(0); } } } }public class MainFrame { public static void main(String[] args) { MFrame mf = new MFrame(); mf.show(); } }
JMenuBar menuBar = new JMenuBar(); JMenu menuFile = new JMenu("File"); JMenu menuOperate = new JMenu("Operate"); JMenuItem loginMenuItem = new JMenuItem("Login",'L'); JMenuItem exitMenuItem = new JMenuItem("Exit",'E');
public MFrame() { //设置菜单 menuBar.add(menuFile); menuFile.add(loginMenuItem); menuFile.addSeparator(); menuFile.add(exitMenuItem); menuBar.add(menuOperate); this.setJMenuBar(menuBar);
public void addContral() { benter = new JButton("确定"); bcancel = new JButton("取消"); lname = new Label("请输入你的昵称"); lpassword = new Label("请输入你的密码"); tname = new JTextField(); tpassword = new JPasswordField(10); p = new JPanel(new GridLayout(3, 2)); c = this.getContentPane(); c.setLayout(new FlowLayout()); p.add(lname); p.add(tname); p.add(lpassword); p.add(tpassword); p.add(benter); p.add(bcancel); c.add(p); }
class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent event) { if(event.getSource()==benter) { JOptionPane.showMessageDialog(null,"登录成功!"); } else if(event.getSource()==bcancel) { System.exit(0); } } } }public class MainFrame { public static void main(String[] args) { MFrame mf = new MFrame(); mf.show(); } }
import javax.swing.tree.*;
import java.awt.event.*;
import java.awt.*;class MFrame extends JFrame
{
private LoginFrame lf;
private JScrollPane p;
private Container c;
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu("File");
JMenu menuOperate = new JMenu("Operate");
JMenuItem loginMenuItem = new JMenuItem("Login",'L');
JMenuItem exitMenuItem = new JMenuItem("Exit",'E');
public MFrame()
{
//设置菜单
menuBar.add(menuFile);
menuFile.add(loginMenuItem);
menuFile.addSeparator();
menuFile.add(exitMenuItem);
menuBar.add(menuOperate);
this.setJMenuBar(menuBar);
//设置事件监听
loginMenuItem.addActionListener(new MyActionListener());
exitMenuItem.addActionListener(new MyActionListener());
setTitle("购物管理系统");
setSize(600,400);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
private class MyActionListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==loginMenuItem)
{
LoginFrame lf = new LoginFrame();
lf.show();
}
else if(e.getSource()==exitMenuItem)
{
System.exit(0);
}
else
System.exit(0);
}
}
}
class LoginFrame extends JFrame
{ private JButton benter;
private JButton bcancel;
private Label lname;
private Label lpassword;
private JTextField tname;
private JPasswordField tpassword;
private JPanel p;
private Container c;
public LoginFrame()
{
setTitle("登录");
setSize(300,200);
addContral();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
//设置事件监听
benter.addActionListener(new MyActionListener());
bcancel.addActionListener(new MyActionListener());
}
public void addContral()
{
benter = new JButton("确定");
bcancel = new JButton("取消");
lname = new Label("请输入你的昵称");
lpassword = new Label("请输入你的密码");
tname = new JTextField();
tpassword = new JPasswordField(10);
p = new JPanel(new GridLayout(3, 2));
c = this.getContentPane();
c.setLayout(new FlowLayout());
p.add(lname);
p.add(tname);
p.add(lpassword);
p.add(tpassword);
p.add(benter);
p.add(bcancel);
c.add(p);
}
class MyActionListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
if(event.getSource()==benter)
{
JOptionPane.showMessageDialog(null,"登录成功!");
}
else if(event.getSource()==bcancel)
{
System.exit(0);
}
}
}
}public class MainFrame { public static void main(String[] args) {
MFrame mf = new MFrame();
mf.show();
}
}
event.getSource().equals()----------------------------------------------------------------------
private class MyActionListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource().equals(loginMenuItem))
{
LoginFrame lf = new LoginFrame();
lf.show();
}
else if(e.getSource().equals(exitMenuItem))
{
System.exit(0);
}
else
System.exit(0);
}
}
import javax.swing.tree.*;
import java.awt.event.*;
import java.awt.*;class MFrame extends JFrame
{
private LoginFrame lf;
private JScrollPane p;
private Container c;
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu("File");
JMenu menuOperate = new JMenu("Operate");
JMenuItem loginMenuItem = new JMenuItem("Login",'L');
JMenuItem exitMenuItem = new JMenuItem("Exit",'E');
public MFrame()
{
//设置菜单
menuBar.add(menuFile);
menuFile.add(loginMenuItem);
menuFile.addSeparator();
menuFile.add(exitMenuItem);
menuBar.add(menuOperate);
this.setJMenuBar(menuBar);
//设置事件监听
loginMenuItem.addActionListener(new MyActionListener());
exitMenuItem.addActionListener(new MyActionListener());
setTitle("购物管理系统");
setSize(600,400);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
private class MyActionListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==loginMenuItem)
{
LoginFrame lf = new LoginFrame();
lf.show();
}
else if(e.getSource()==exitMenuItem)
{
System.exit(0);
}
else
System.exit(0);
}
}
}
class LoginFrame extends JFrame
{ private JButton benter;
private JButton bcancel;
private Label lname;
private Label lpassword;
private JTextField tname;
private JPasswordField tpassword;
private JPanel p;
private Container c;
public LoginFrame()
{
setTitle("登录");
setSize(300,200);
addContral();
/*this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 楼主主要问题处在这里了,这个方法和下面的那个事件监听,都是用来中止应用程序的。注释掉就没问题了!
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});*/
//设置事件监听
benter.addActionListener(new MyActionListener());
bcancel.addActionListener(new MyActionListener());
}
public void addContral()
{
benter = new JButton("确定");
bcancel = new JButton("取消");
lname = new Label("请输入你的昵称");
lpassword = new Label("请输入你的密码");
tname = new JTextField();
tpassword = new JPasswordField(10);
p = new JPanel(new GridLayout(3, 2));
c = this.getContentPane();
c.setLayout(new FlowLayout());
p.add(lname);
p.add(tname);
p.add(lpassword);
p.add(tpassword);
p.add(benter);
p.add(bcancel);
c.add(p);
}
class MyActionListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
if(event.getSource()==benter)
{
JOptionPane.showMessageDialog(null,"登录成功!");
}
else if(event.getSource()==bcancel)
{
System.exit(0);
}
}
}
}public class MainFrame { public static void main(String[] args) {
MFrame mf = new MFrame();
mf.show();
}
}