package Com.SwingTest;

 import java.awt.BorderLayout;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import javax.swing.JButton;

 import javax.swing.JFrame;

 import javax.swing.JLabel;

 import javax.swing.JPanel;

 public class SwingText_12 extends JFrame {

     //定义动作事件的属性

     private JLabel label;   //用来提示信息

     public SwingText_12() {

         // TODO Auto-generated constructor stub

         //对窗体进行设置

         super();

         setTitle("动作事件示例");

         setBounds(100,100,500,375);

         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    //设置关闭窗体时退出程序

         //对标签进行设置

         label=new JLabel();

         label.setText("欢迎登录！");

         label.setHorizontalAlignment(JLabel.CENTER);

         //对控制面板进行设置

         JPanel panel=new JPanel();

         getContentPane().add(label);

         //对按钮进行设置

         final JButton submitButton=new JButton();

         submitButton.setText("登录");

         submitButton.addActionListener(new buttonListener());

         getContentPane().add(submitButton,BorderLayout.SOUTH);

     }

     public static void main(String[] args) {

         // TODO Auto-generated method stub

         SwingText_12 frame=new SwingText_12();

           frame.setVisible(true);

     }

     class  buttonListener implements ActionListener{

         @Override

         public void actionPerformed(ActionEvent e) {

             // TODO Auto-generated method stub

             JButton button=(JButton) e.getSource();  //获得处罚此次事件的按钮对象

             String buttonName=e.getActionCommand();   //h获得触发此次事件的按钮的标签文本

             if(buttonName.equals("登录")){

                   label.setText("您已经成功登录");

                   button.setText("退出");

             }else{

                   label.setText("您已经安全退出");

                   button.setText("登录");

             }

         }

     }

 }