源代码：
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/**
*本程序完成的功能是利用汉递规算法实现汉诺塔的动态演示程序
*/
import javax.swing.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.*;
public class Hanio extends JApplet implements ActionListener, Runnable
{
/**
*diskNum是盘子的数量
*/
private int diskNum ;
/**
*各个组件的句柄
*/
private JButton begin, stop;
private JLabel lDiskNum;
private JTextField text;
JPanel pane;
/**
*定义一个线程句柄
*/
private Thread animate;
/**
*定义a,b,c三个柱子上是否有盘子，有哪些盘子
*/
private int adisk[];
private int bdisk[];
private int cdisk[];
public void init()
{
Container content = getContentPane();
content.setLayout(new BorderLayout());
lDiskNum = new JLabel(盘子的数目);
text = new JTextField(8);
begin = new JButton(开始);
begin.addActionListener(this);
stop = new JButton(停止);
stop.addActionListener(this);
pane = new JPanel();
pane.setLayout(new FlowLayout());
pane.add(lDiskNum);
pane.add(text);
pane.add(begin);
pane.add(stop);
content.add(pane, BorderLayout.SOUTH);
}
public void paint(Graphics g)
{
Graphics2D g2D = (Graphics2D)g;
Ellipse2D.Double ellipse;
g2D.setPaint(getBackground());
if(adisk != null)
{
/**
*消除以前画的盘子
*/
for(int j=adisk.length, i=0; --j=0; i++ )
{
ellipse = new Ellipse2D.Double(20+i*5, 180-i*10, 180-i*10, 20);
g2D.fill(ellipse);
ellipse = new Ellipse2D.Double(220+i*5, 180-i*10, 180-i*10, 20);
g2D.fill(ellipse);
ellipse = new Ellipse2D.Double(420+i*5, 180-i*10, 180-i*10, 20);
g2D.fill(ellipse);
}
drawEllipse(g, 20, adisk);//画A组盘子
drawEllipse(g, 220, bdisk);//画B组盘子
drawEllipse(g, 420, cdisk);//画C组盘子
}
pane.repaint();
}
public void update(Graphics g)
{
paint(g);
}
/**画出椭圆代表盘子，g是图形环境，x是最下面的盘子的横坐标，
*arr是柱子数组
*/
public void drawEllipse(Graphics g,int x,int arr[])
{
Graphics2D g2D = (Graphics2D)g;
Ellipse2D.Double ellipse;
g2D.setPaint(Color.gray);
g2D.draw(new Line2D.Double(x+90, 10, x+90, 180));
for(int j=arr.length, i=0; --j=0; i++ )
if(arr[j] != 0)
{
if(i%2 == 0)
g2D.setPaint(Color.blue);
else
g2D.setPaint(Color.red);
ellipse = new Ellipse2D.Double(x+i*5, 180-i*10, 180-i*10, 20);
g2D.fill(ellipse);
}
}
public void actionPerformed(ActionEvent e)
{
String command = e.getActionCommand();
if(command.equals(开始))
{
/**
*进行初始化，开始的时候只有a柱子上有盘子，其他柱子都没有
*/
diskNum = Integer.parseInt(text.getText());
adisk = new int[diskNum];
for(int i=0; iadisk.length; i++)
adisk[i] = 1;
bdisk = new int[diskNum];
for(int k=0; kbdisk.length; k++)
bdisk[k] = 0;
cdisk = new int[diskNum];
for(int i=0; icdisk.length; i++)
cdisk[i] = 0;
repaint();
if(animate == null || !animate.isAlive())//创建一个线程
{
animate = new Thread(this);
animate.start();
}
}
if(command.equals(停止))
{
for(int k=0; kbdisk.length; k++)
bdisk[k] = 0;
for(int i=0; icdisk.length; i++)
cdisk[i] = 0;
repaint();
text.setText();
animate = null;
}
}
/**
*线程方法，在此调用汉诺塔执行移动盘子操作
*/
public void run()
{
hanio(diskNum, 'A', 'B', 'C');
repaint();
}
/**
*汉诺塔递规调用程序，n是盘子的数量，A，B，C分别代表三个柱子
*/
public void hanio(int n, char A, char B, char C)
{
if(n 1)
{
hanio(n-1, A, C, B);
pause();//停顿几秒在执行
switch(A)
{
case 'A':adisk[n-1] = 0;break;
case 'B':bdisk[n-1] = 0;break;
case 'C':cdisk[n-1] = 0;break;
default:break;
}
switch(C)
{
case 'A':adisk[n-1] = 1;break;
case 'B':bdisk[n-1] = 1;break;
case 'C':cdisk[n-1] = 1;break;
default:break;
}
repaint();
hanio(n-1, B, A, C);
}
pause();
switch(A)
{
case 'A':adisk[n-1] = 0;break;
case 'B':bdisk[n-1] = 0;break;
case 'C':cdisk[n-1] = 0;break;
default:break;
}
switch(C)
{
case 'A':adisk[n-1] = 1;break;
case 'B':bdisk[n-1] = 1;break;
case 'C':cdisk[n-1] = 1;break;
default:break;
}
repaint();
}
/**
*每隔半妙钟移动一个盘子
*/
public void pause()
{
try{
Thread.sleep(500);//可以修改此值加快盘子移动的速度
}catch(InterruptedException e){}
}
}
import java.security.*;
import javax.crypto.*;
/**
* 本例解释如何利用DES私钥加密算法加解密
*
* @author Devon
* @version 1.0 04/03/10
*/
public class SingleKeyExample {
public static void main(String[] args) {
try {
String algorithm = "DES"; //定义加密算法,可用 DES,DESede,Blowfish
String message = "Hello World. 这是待加密的信息";
// 生成个DES密钥
KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm);
keyGenerator.init(56); //选择DES算法,密钥长度必须为56位
Key key = keyGenerator.generateKey(); //生成密钥
// 生成Cipher对象
Cipher cipher = Cipher.getInstance("DES");
//用密钥加密明文(message),生成密文(cipherText)
cipher.init(Cipher.ENCRYPT_MODE, key); //操作模式为加密(Cipher.ENCRYPT_MODE),key为密钥
byte[] cipherText = cipher.doFinal(message.getBytes()); //得到加密后的字节数组
System.out.println("加密后的信息: " + new String(cipherText));
//用密钥加密明文(plainText),生成密文(cipherByte)
cipher.init(Cipher.DECRYPT_MODE, key); //操作模式为解密,key为密钥
byte[] sourceText = cipher.doFinal(cipherText); //获得解密后字节数组
System.out.println("解密后的信息: " + new String(sourceText));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
/**
* @author Devon
*/
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
public class PairKeyExample {
public static void main(String argv[]) {
try {
String algorithm = "RSA"; //定义加密算法,可用 DES,DESede,Blowfish
String message = "张三，你好，我是李四";
//产生张三的密钥对(keyPairZhang)
KeyPairGenerator keyGeneratorZhang =
KeyPairGenerator.getInstance(algorithm); //指定采用的算法
keyGeneratorZhang.initialize(1024); //指定密钥长度为1024位
KeyPair keyPairZhang = keyGeneratorZhang.generateKeyPair(); //产生密钥对
System.out.println("生成张三的公钥对");
// 张三生成公钥(publicKeyZhang)并发送给李四,这里发送的是公钥的数组字节
byte[] publicKeyZhangEncode = keyPairZhang.getPublic().getEncoded();
//通过网络或磁盘等方式,把公钥编码传送给李四
//李四接收到张三编码后的公钥,将其解码
KeyFactory keyFacoryLi = KeyFactory.getInstance(algorithm); //得到KeyFactory对象
X509EncodedKeySpec x509KeySpec =
new X509EncodedKeySpec(publicKeyZhangEncode); //公钥采用X.509编码
PublicKey publicKeyZhang = keyFacoryLi.generatePublic(x509KeySpec); //将公钥的KeySpec对象转换为公钥
System.out.println("李四成功解码,得到张三的公钥");
//李四用张三的公钥加密信息，并发送给李四
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); //得到Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, publicKeyZhang); //用张三的公钥初始化Cipher对象
byte[] cipherMessage = cipher.doFinal(message.getBytes()); //得到加密信息
System.out.println("加密后信息：" + new String(cipherMessage));
System.out.println("加密完成，发送给李四...");
//张三用自己的私钥解密从李四处收到的信息
cipher.init(Cipher.DECRYPT_MODE, keyPairZhang.getPrivate()); //张三用其私钥初始化Cipher对象
byte[] originalMessage = cipher.doFinal(cipherMessage); //得到解密后信息
System.out.println("张三收到信息，解密后为：" + new String(originalMessage));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
package com.test01;
import java.util.Scanner;
public class oop5 { public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
// int x = 9;
// int y = 1;
int x = sc.nextInt();
int y = sc.nextInt();
int z;
z = add(x, y);
System.out.println("x的值为：" + x);
System.out.println("y的值为：" + y);
System.out.println("二者之和为：" + z);
}
/** 四种小算法 */
// 加法运算
public static int add(int a, int b) {
int c;
c = a + b;
return c;
}
// 减法运算
public static int jian(int d, int v) {
int m;
m = d - v;
return m;
}
// 乘积运算
public static int addAdd(int q, int w) {
int e;
e = q * w;
return e;
}
// 除法运算
public static int chu(int p, int k) {
int f;
f = p / k;
return f;
}
}