加密与解密原理的一个例子
package lockunlock;
import Java.awt.*;
import java.awt.event.*;
import java.Applet.*;
import javax.Swing.*;
import java.util.*;
public class LockUnlock extends JApplet {
private boolean isStandalone = false;
//Get a parameter value
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
//Construct the applet
public LockUnlock() {
}
//Initialize the applet
public void init() {
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
//Component initialization
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
jLabel1.setText("String");
jLabel1.setBounds(new Rectangle(35, 36, 57, 21));
contentPane.setLayout(null);
this.setSize(new Dimension(400, 300));
jLabel2.setText("String length");
jLabel2.setBounds(new Rectangle(29, 73, 69, 22));
jTextField1.setText("");
jTextField1.setBounds(new Rectangle(108, 40, 166, 17));
jTextField2.setText("");
jTextField2.setBounds(new Rectangle(107, 72, 56, 21));
jButton1.setBounds(new Rectangle(30, 236, 137, 27));
jButton1.setText("Exercise 3");
jButton1.addActionListener(new LockUnlock_jButton1_actionAdapter(this));
jButton2.setBounds(new Rectangle(218, 237, 131, 27));
jButton2.setText("Exercise 4");
jButton2.addActionListener(new LockUnlock_jButton2_actionAdapter(this));
jTextField3.setText("");
jTextField3.setBounds(new Rectangle(106, 105, 58, 21));
jLabel3.setText("MoShu");
jLabel3.setBounds(new Rectangle(36, 106, 86, 18));
contentPane.add(jLabel1, null);
contentPane.add(jButton2, null);
contentPane.add(jButton1, null);
contentPane.add(jLabel3, null);
contentPane.add(jTextField2, null);
contentPane.add(jLabel2, null);
contentPane.add(jTextField3, null);
contentPane.add(jTextField1, null);
}
//Get Applet information
public String getAppletInfo() {
return "Applet Information";
