package stringhandle;import java.awt.*;import java.awt.event.*;import javax.swing.*;import com.borland.jbcl.layout.*;/** * <p>Title:  string Handle Demo</p> * <p>Description: This is a string Handle Demo</p> * <p>Copyright: Copyright (c) 2002</p> * <p>Company: D6-125</p> * @author liujun * @version 1.0 */public class stringHandleFrame extends JFrame {  JPanel contentPane;  JTextField jTextField1 = new JTextField();  XYLayout xYLayout1 = new XYLayout();  JButton jButton1 = new JButton();  JLabel jLabel1 = new JLabel();  JLabel jLabel2 = new JLabel();  JLabel jLabel3 = new JLabel();  boolean changebutton=true;  //Construct the frame  public stringHandleFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(stringHandleFrame.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    contentPane.setLayout(xYLayout1);    this.setResizable(false);    this.setSize(new Dimension(394, 245));    this.setTitle("string Handle Frame Demo");    jButton1.setText("添加字符串");    jButton1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton1_actionPerformed(e);      }    });    contentPane.add(jTextField1,     new XYConstraints(22, 10, 245, 30));    contentPane.add(jButton1,    new XYConstraints(279, 10, 108, 31));    contentPane.add(jLabel1,   new XYConstraints(16, 65, 361, 43));    contentPane.add(jLabel2,  new XYConstraints(16, 128, 361, 43));    contentPane.add(jLabel3, new XYConstraints(16, 187, 361, 43));  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void jButton1_actionPerformed(ActionEvent e) {    String name;  //用于按鈕的名字比較    int a; //用于判斷兩個字符串的比較結果    name=jButton1.getText();    //得到按鈕的文本標簽    if(name.equals("比較")){    //若是“比較”，則執行字符串比較功能          a=jLabel1.getText().compareTo(jLabel2.getText());//得到比較結果            if(a<0){  //字符串1小于字符串2，設置標簽三               jLabel3.setText("字符串1小于字符串2");               }else if(a>0){  //字符串1大于字符串2，設置標簽三               jLabel3.setText("字符串1大于字符串2");                }else{  //字符串1和字符串2相等，設置標簽三               jLabel3.setText("字符串1和字符串2相等");               }         changebutton=true;         jButton1.setText("添加字符串1");//比較完成，將按鈕標簽重置        }else if(changebutton){//添加第一個字符串          jLabel1.setText(jTextField1.getText()); //添加字串到標簽1中          changebutton=!changebutton; //更改changebutton變量值          jTextField1.setText("");  //清空輸入文本框          jButton1.setText("添加字符串2");//更改按鈕標簽          jLabel2.setText("");  //清空標簽2          jLabel3.setText("");  //清空標簽3          }else{  //添加第二個字符串          jLabel2.setText(jTextField1.getText()); //添加字串到標簽2中          changebutton=!changebutton;//更改changebutton變量值          jTextField1.setText(""); //清空輸入文本框          jButton1.setText("比較"); //更改按鈕標簽          }  }}