表1. CheckerDrag.java
// CheckerDrag.javaimport java.awt.*;import java.awt.event.*;public class CheckerDrag extends java.applet.Applet{ // Dimension of checkerboard square. // 棋盘上每个小方格的尺寸 final static int SQUAREDIM = 40; // Dimension of checkerboard -- includes black outline. // 棋盘的尺寸 – 包括黑色的轮廓线 final static int BOARDDIM = 8 * SQUAREDIM + 2; // Dimension of checker -- 3/4 the dimension of a square. // 棋子的尺寸 – 方格尺寸的3/4 final static int CHECKERDIM = 3 * SQUAREDIM / 4; // Square colors are dark green or white. // 方格的颜色为深绿色或者白色 final static Color darkGreen = new Color (0, 128, 0); // Dragging flag -- set to true when user presses mouse button over checker // and cleared to false when user releases mouse button. // 拖动标记 --当用户在棋子上按下鼠标按键时设为true， // 释放鼠标按键时设为false boolean inDrag = false; // Left coordinate of checkerboard's upper-left corner. // 棋盘左上角的左方向坐标 int boardx; // Top coordinate of checkerboard's upper-left corner. //棋盘左上角的上方向坐标 int boardy; // Left coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原点(左上角)的左方向坐标 int ox; // Top coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原点(左上角)的上方向坐标 int oy; // Left displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按键时的鼠标坐标与棋子矩形原点之间的左方向位移 int relx; // Top displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按键时的鼠标坐标与棋子矩形原点之间的上方向位移 int rely; // Width of applet drawing area. // applet绘图区域的宽度 int width; // Height of applet drawing area. // applet绘图区域的高度 int height; // Image buffer. // 图像缓冲 Image imBuffer; // Graphics context associated with image buffer. // 图像缓冲相关联的图形背景 Graphics imG; public void init () { // Obtain the size of the applet's drawing area. // 获取applet绘图区域的尺寸 width = getSize ().width; height = getSize ().height; // Create image buffer. // 创建图像缓冲 imBuffer = createImage (width, height); // Retrieve graphics context associated with image buffer. // 取出图像缓冲相关联的图形背景 imG = imBuffer.getGraphics (); // Initialize checkerboard's origin, so that board is centered. // 初始化棋盘的原点，使棋盘在屏幕上居中 boardx = (width - BOARDDIM) / 2 + 1; boardy = (height - BOARDDIM) / 2 + 1; // Initialize checker's rectangle's starting origin so that checker is // centered in the square located in the top row and second column from // the left. // 初始化棋子矩形的起始原点，使得棋子在第一行左数第二列的方格里居中 ox = boardx + SQUAREDIM + (SQUAREDIM - CHECKERDIM) / 2 + 1; oy = boardy + (SQUAREDIM - CHECKERDIM) / 2 + 1; // Attach a mouse listener to the applet. That listener listens for // mouse-button press and mouse-button release events. // 向applet添加一个用来监听鼠标按键的按下和释放事件的鼠标监听器 addMouseListener (new MouseAdapter () { public void mousePressed (MouseEvent e) { // Obtain mouse coordinates at time of press. // 获取按键时的鼠标坐标 int x = e.getX (); int y = e.getY (); // If mouse is over draggable checker at time // of press (i.e., contains (x, y) returns // true), save distance between current mouse // coordinates and draggable checker origin // (which will always be positive) and set drag // flag to true (to indicate drag in progress). // 在按键时如果鼠标位于可拖动的棋子上方 // （也就是contains (x, y)返回true），则保存当前 // 鼠标坐标与棋子的原点之间的距离（始终为正值）并且 // 将拖动标志设为true（用来表明正处在拖动过程中） if (contains (x, y)) { relx = x - ox; rely = y - oy; inDrag = true; } } boolean contains (int x, int y) { // Calculate center of draggable checker. // 计算棋子的中心位置 int cox = ox + CHECKERDIM / 2; int coy = oy + CHECKERDIM / 2; // Return true if (x, y) locates with bounds // of draggable checker. CHECKERDIM / 2 is the // radius. // 如果(x, y)仍处于棋子范围内则返回true // CHECKERDIM / 2为半径 return (cox - x) * (cox - x) + (coy - y) * (coy - y) < CHECKERDIM / 2 * CHECKERDIM / 2; } public void mouseReleased (MouseEvent e) { // When mouse is released, clear inDrag (to // indicate no drag in progress) if inDrag is // already set. // 当鼠标按键被释放时，如果inDrag已经为true， // 则将其置为false（用来表明不在拖动过程中） if (inDrag) inDrag = false; } }); // Attach a mouse motion listener to the applet. That listener listens // for mouse drag events. //向applet添加一个用来监听鼠标拖动事件的鼠标运动监听器 addMouseMotionListener (new MouseMotionAdapter () { public void mouseDragged (MouseEvent e) { if (inDrag) { // Calculate draggable checker's new // origin (the upper-left corner of // the checker rectangle). // 计算棋子新的原点（棋子矩形的左上角） int tmpox = e.getX () - relx; int tmpoy = e.getY () - rely; // If the checker is not being moved // (at least partly) off board, // assign the previously calculated // origin (tmpox, tmpoy) as the // permanent origin (ox, oy), and // redraw the display area (with the // draggable checker at the new // coordinates). // 如果棋子（至少是棋子的一部分）没有被 // 移出棋盘，则将之前计算的原点 // (tmpox, tmpoy)赋值给永久性的原点(ox, oy)， // 并且刷新显示区域（此时的棋子已经位于新坐标上） if (tmpox > boardx && tmpoy > boardy && tmpox + CHECKERDIM < boardx + BOARDDIM && tmpoy + CHECKERDIM < boardy + BOARDDIM) { ox = tmpox; oy = tmpoy; repaint (); } } } }); } public void paint (Graphics g) { // Paint the checkerboard over which the checker will be dragged. // 在棋子将要被拖动的位置上绘制棋盘 paintCheckerBoard (imG, boardx, boardy); // Paint the checker that will be dragged. // 绘制即将被拖动的棋子 paintChecker (imG, ox, oy); // Draw contents of image buffer. // 绘制图像缓冲的内容 g.drawImage (imBuffer, 0, 0, this); } void paintChecker (Graphics g, int x, int y) { // Set checker shadow color. // 设置棋子阴影的颜色 g.setColor (Color.black); // Paint checker shadow. // 绘制棋子的阴影 g.fillOval (x, y, CHECKERDIM, CHECKERDIM); // Set checker color. // 设置棋子颜色 g.setColor (Color.red); // Paint checker. // 绘制棋子 g.fillOval (x, y, CHECKERDIM - CHECKERDIM / 13, CHECKERDIM - CHECKERDIM / 13); } void paintCheckerBoard (Graphics g, int x, int y) { // Paint checkerboard outline. // 绘制棋盘轮廓线 g.setColor (Color.black); g.drawRect (x, y, 8 * SQUAREDIM + 1, 8 * SQUAREDIM + 1); // Paint checkerboard. // 绘制棋盘 for (int row = 0; row < 8; row++) { g.setColor (((row & 1) != 0) ? darkGreen : Color.white); for (int col = 0; col < 8; col++) { g.fillRect (x + 1 + col * SQUAREDIM, y + 1 + row * SQUAREDIM, SQUAREDIM, SQUAREDIM); g.setColor ((g.getColor () == darkGreen) ? Color.white : darkGreen); } } } // The AWT invokes the update() method in response to the repaint() method // calls that are made as a checker is dragged. The default implementation // of this method, which is inherited from the Container class, clears the // applet's drawing area to the background color prior to calling paint(). // This clearing followed by drawing causes flicker. CheckerDrag overrides // update() to prevent the background from being cleared, which eliminates // the flicker. // AWT调用了update()方法来响应拖动棋子时所调用的repaint()方法。该方法从 // Container类继承的默认实现会在调用paint()之前，将applet的绘图区域清除 // 为背景色，这种绘制之后的清除就导致了闪烁。CheckerDrag重写了update()来 // 防止背景被清除，从而消除了闪烁。 public void update (Graphics g) { paint (g); }}
用JAVA编写一个小游戏
首先写个类命名people
public class people
{
//定义人有的属性
int blood;//血
int force;//攻击力
//定义构造方法对人进行初始化
public people(int blood,int force)
{
this.blood=blood;
this.force=force;
}
//定义人的方法，比如攻击
public void attrack(people x)
{
x.blood-=this.force;
}
}
主体中代码：
people a=new people(100,20);
people b=new people(100,30);
//建一个线程a攻击b
xiancheng one=new xiancheng(a,b);
thread t1= new Thread(one);
t1.start();
//800毫秒后建一个线程b攻击a;
thread.sleep(800);
xiancheng two=new xiancheng(b,a);
thread t2= new Thread(two);
t2.start();
class xiancheng implements runnable //继承runnable接口
{
people x;
people y;
public xiancheng(people x,people y )
{
this.x=x;
this.y=y;
}
pulbic vid run()
{
while(y.blood>0)
{
x.attrack(y);
thread.sleep(800);
}
}
}
//很久没用java了线程有点忘了，，汗
前天写的猜数字游戏，yong?i控制猜测次数，有详细解析，用黑窗口可以直接运行，
我试验过了，没问题
import javax.swing.Icon;import javax.swing.JOptionPane;
public class CaiShuZi4JOptionPane {
public static void main(String[] args) {
Icon icon = null;
boolean bl = false;
int put = 0;
int c = (int) (((Math.random())*100)+1); //获取一个1-100的随机数
System.out.println("你获取的随机数是："+c); //打印你的随机数字
String str1 = (String) JOptionPane.showInputDialog(null,"请输入你的猜测数字(1-100)：n","猜数字游戏",JOptionPane.PLAIN_MESSAGE,icon,null,"在这输入"); //第一次输入你的猜测数字
if(str1==null){
JOptionPane.showMessageDialog(null, "你已经取消了本次游戏"); //如果你点取消那么本次游戏结束
}else{
bl = num(str1); //判断是输入的是不是数字或者是整数
if(true==bl){ //如果是数字的话进入与随机数比较的程序
System.out.println("你输入的数字是："+str1); //打印你输入的数字
put = Integer.valueOf(str1);
for(int i = 4;i > 0;i--){ //i是你可以猜测的次数
if(put==c){
JOptionPane.showMessageDialog(null, "恭喜你猜对了，正确答案是:"+c+"。"); //如果你猜对了就直接结束循环
break;
}else if(put>c){ //如果输大了就让你再次从新输入
str1 = (String) JOptionPane.showInputDialog(null,"你的输入过大。你还有"+i+"次机会，请重新输入：n","猜数字游戏",JOptionPane.PLAIN_MESSAGE,icon,null,"在这输入");
if(str1==null){
JOptionPane.showMessageDialog(null, "你已经取消了本次输入");
break;
}else{
bl =num(str1);
if(true==bl){
put = Integer.valueOf(str1);
}else{
JOptionPane.showMessageDialog(null, "你的输入不正确，请重新输入");
}
}
}else if(put<c){ //如果你输小了也让你从新输入
str1 = (String) JOptionPane.showInputDialog(null,"你的输入过小。你还有"+i+"次机会，请重新输入：n","猜数字游戏",JOptionPane.PLAIN_MESSAGE,icon,null,"在这输入");
if(str1==null){
JOptionPane.showMessageDialog(null, "你已经取消了本次输入");
break;
}else{
bl =num(str1);
if(true==bl){
put = Integer.valueOf(str1);
}else{
JOptionPane.showMessageDialog(null, "你的输入不正确，请重新输入");
}
}
}
}
}else if(bl==false){ //这个 是你第一次如果填写的不是数字的话也会结束本次游戏
JOptionPane.showMessageDialog(null, "请您下次按要求填写。本次游戏结束");
}
if(true==bl && c!=put){ //如果你i次都没猜对，那么就直接告诉你这个数十什么
JOptionPane.showMessageDialog(null, "很遗憾你没能猜对，这个数字是："+c+".");
}
}
}
public static boolean num(String value){ //一个静态方法，判断你输入的是不是数字
try {
Integer.parseInt(value);
return true;
} catch (Exception e) {
return false;
}
}
}
