Sanziqi.rar_sanziqi_三子棋

import java.awt.*; import java.awt.event.*; import java.applet.Applet; public class Sanziqi extends Applet { int white; int black; final static int moves[] = {4, 0, 2, 6, 8, 1, 3, 5, 7}; static boolean won[] = new boolean[512]; //将整数1左移9位变为(1000000000)2=2^9=512 static final int DONE = 511; //DONE=511 static final int OK = 0; static final int WIN = 1; static final int LOSE = 2; static final int STALEMATE = 3; static void isWon(int pos) { for (int i = 0 ; i < DONE ; i++) if (i==pos) //i与pos进行位与操作 won[i] = true; } static //这是什么语法? { isWon(7); // 00000111=7 isWon(56); // 00111000=2^5+2^4+2^3=56 isWon(448); // 111000000=256+128+64=448 isWon(73); // 01001001=64+8+1=73 isWon(146); // 10010010=128+16+2=146 isWon(292); // 100100100=256+32+4=292 isWon(273); // 100010001=256+16+1=273 isWon(84); // 01010100=64+16+4=84 } int bestMove(int white, int black) { int bestmove = -1; loop: for (int i = 0 ; i < 9 ; i++) { int mw = moves[i]; // moves[] = {4, 0, 2, 6, 8, 1, 3, 5, 7}; if (((white & (1 << mw)) == 0) && ((black & (1 << mw)) == 0)) //作啥用啊? { int pw = white | (1 << mw); //作啥用啊? if (won[pw]) return mw; for (int mb = 0 ; mb < 9 ; mb++) //作啥用啊? if (((pw & (1 << mb)) == 0) && ((black & (1 << mb)) == 0)) { int pb = black | (1 << mb); if (won[pb]) continue loop; //带标号的continue语句 } if (bestmove == -1) bestmove = mw; } } if (bestmove != -1) return bestmove; for (int i = 0 ; i < 9 ; i++) { int mw = moves[i]; if (((white & (1 << mw)) == 0) && ((black & (1 << mw)) == 0)) //作啥用啊? return mw; } return -1; } boolean yourMove(int m) { if ((m < 0) || (m > 8)) return false; if (((black | white) & (1 << m)) != 0) return false; black |= 1 << m; //作啥用啊? return true; } boolean myMove() { if ((black | white) == DONE) return false; int best = bestMove(white, black); white |= 1 << best; return true; } int status() { if (won[white]) return WIN; if (won[black]) return LOSE; if ((black | white) == DONE) return STALEMATE; return OK; } boolean first = true; Image notImage; Image crossImage; public void init() { notImage = getImage(getCodeBase(), "images/not.gif"); //载入图片 crossImage = getImage(getCodeBase(), "images/cross.gif"); //载入图片 addMouseListener(new MouseReleasedHander()); } public void paint(Graphics g) { Dimension d = getSize(); //获得当前绘图区大小 g.setColor(Color.GREEN); //设置绘图颜色 int xoff = d.width / 3; int yoff = d.height / 3; g.drawLine(xoff, 0, xoff, d.height); //绘制棋盘网格 g.drawLine(2*xoff, 0, 2*xoff, d.height); g.drawLine(0, yoff, d.width, yoff); g.drawLine(0, 2*yoff, d.width, 2*yoff); int i = 0; for (int r = 0 ; r < 3 ; r++) for (int c = 0 ; c < 3 ; c++, i++) if ((white & (1 << i)) != 0) g.drawImage(notImage, c*xoff + 1, r*yoff + 1, this); //在指定坐标绘制棋子 else if ((black & (1 << i)) != 0) g.drawImage(crossImage, c*xoff + 1, r*yoff + 1, this); } private class MouseReleasedHander extends MouseAdapter //扩展MouseAdapter,只需重写必要的函数mouseReleased { public void mouseReleased(MouseEvent e) { int x = e.getX(); int y = e.getY(); switch (status()) { case WIN: case LOSE: case STALEMATE: white = black = 0; if (first) white |= 1 << (int)(Math.random() * 9); first = !first; repaint(); return; } Dimension d = getSize(); int c = (x * 3) / d.width; int r = (y * 3) / d.height; if (yourMove(c + r * 3)) { repaint(); switch (status()) { case WIN: case LOSE: case STALEMATE: break; default: if (myMove()) repaint(); } } } } //inner class end } //end of public class