JAVA编程实例/很不错的jAVA书

package ch09.section09; import example.About; import java.util.Random; import javax.microedition.lcdui.*; import javax.microedition.midlet.MIDlet; public class Board extends Canvas implements CommandListener { MIDlet midlet; Display dpy; Options options; //初始化一个长度为15的字符串 String letters = "RATEYOURMINDPAL"; Font font; Piece blankp; Piece[] all; Piece[][] grid; Random rand; //定义坐标 int gridx; int gridy; //定义长宽 int gridw; int gridh; //定义单元格区域 int cellw; int cellh; int cellyoff; int cellxoff; //定义功能按钮 static final int CMD_ABOUT = 0; static final int CMD_EXIT = 1; static final int CMD_OPTIONS = 2; static final int CMD_RESET = 3; static final int CMD_START = 4; static final int CMD_UNLOCK = 5; static final int CMD_ZLAST = 6; Command cmd[]; //声明变量 static final int INITIALIZED = 0; static final int PLAYING = 1; static final int WON = 2; int gameState; boolean cheated; void D(String s) { System.out.println(s); } class Piece { String label; boolean inv; int serial; //单元格初始化坐标 int ix, iy; //单元格当前坐标 int x, y; Piece(String str, int ser, int nx, int ny, boolean v) { label = str; serial = ser; x = ix = nx; y = iy = ny; inv = v; } void setLocation(int nx, int ny) { x = nx; y = ny; } boolean isHome() { return (x == ix) && (y == iy); } void goHome() { setGrid(this, ix, iy); } //设置背景色为白色 void paint(Graphics g) { int px = x * cellw; int py = y * cellh; if (label != null) { if (inv) { //边框为黑色 g.setColor(0); g.setFont(font); g.drawRect(px, py, cellw - 2, cellh - 2); g.drawString(label, px + cellxoff, py + cellyoff, Graphics.TOP | Graphics.LEFT); } else { //空白框 g.setColor(0); g.fillRect(px, py, cellw - 1, cellh - 1); g.setColor(0xFFFFFF); g.setFont(font); g.drawString(label, px + cellxoff, py + cellyoff, Graphics.TOP | Graphics.LEFT); } } } } class BoardCommand extends Command { int tag; BoardCommand(String label, int type, int pri, int tag_) { super(label, type, pri); tag = tag_; } } void setGrid(Piece p, int x, int y) { grid[x][y] = p; p.setLocation(x, y); } //移动单元格 void moveBlank(int swapx, int swapy) { setGrid(grid[swapx][swapy], blankp.x, blankp.y); setGrid(blankp, swapx, swapy); } void swap(int x1, int y1, int x2, int y2) { Piece t = grid[x1][y1]; setGrid(grid[x2][y2], x1, y1); setGrid(t, x2, y2); } boolean isSolved() { for (int i = 0; i < gridh; i++) { for (int j = 0; j < gridw; j++) { if (!grid[j][i].isHome()) { return false; } } } return true; } //获取一个取值范围在[0..n]之间的一个整数 int randRange(int n) { int r = rand.nextInt() % n; if (r < 0) { r += n; } return r; } void randomize_by_moving() { int dx, dy, v; for (int i = 0; i < 100; i++) { dx = dy = 0; v = (rand.nextInt() & 2) - 1; // 1 or -1 if ( (rand.nextInt() & 1) == 0) { dx = v; } else { dy = v; } if (blankp.x + dx < 0) { dx = 1; } if (blankp.x + dx == gridw) { dx = -1; } if (blankp.y + dy < 0) { dy = 1; } if (blankp.y + dy == gridh) { dy = -1; } moveBlank(blankp.x + dx, blankp.y + dy); } //移动至右下角 while (blankp.x != gridw - 1) { moveBlank(blankp.x + 1, blankp.y); } while (blankp.y != gridh - 1) { moveBlank(blankp.x, blankp.y + 1); } } void shuffle() { int limit = gridw * gridh - 1; Piece ta[] = new Piece[limit]; Piece temp; System.arraycopy(all, 0, ta, 0, limit); for (int i = 0; i < limit; i++) { int j = randRange(limit); temp = ta[j]; ta[j] = ta[i]; ta[i] = temp; } for (int i = 0; i < limit; i++) { setGrid(ta[i], i / gridw, i % gridw); } setGrid(blankp, gridw - 1, gridh - 1); } void randomize(boolean hard) { shuffle(); int ra, rb; int x, y; if (hard) { ra = 7; rb = 0; } else { ra = 0; rb = 7; } x = rand.nextInt() & 1; y = rand.nextInt() & 1; if (x == 1 && y == 1) { x = 2; y = 0; } swap(x, y, all[ra].x, all[ra].y); swap( (rand.nextInt() & 1) + 1, 3, all[rb].x, all[rb].y); if ( (displacement() & 1) == 1) { swap(1, 3, 2, 3); } } //计算匹配数，空白格必须在右下角 int displacement() { boolean temp[] = new boolean[gridw * gridh - 1]; int n = 0; for (int i = 0; i < gridh; i++) { for (int j = 0; j < gridw; j++) { Piece p = grid[j][i]; if (p == blankp) { continue; } temp[p.serial] = true; for (int k = 0; k < p.serial; k++) { if (!temp[k]) { n++; } } } } return n; } void resetGrid() { Piece temp[] = new Piece[gridw * gridh]; int k = 0; for (int i = 0; i < gridw; i++) { for (int j = 0; j < gridh; j++) { temp[k++] = grid[i][j]; } } for (k = 0; k < temp.length; k++) { temp[k].goHome(); } } void rearrangeFunnily(boolean hard) { resetGrid(); if (hard) { //难级别 swap(0, 0, 3, 1); swap(2, 2, 3, 2); swap(3, 2, 0, 3); swap(0, 3, 2, 3); } else { //易级别 swap(2, 2, 3, 2); swap(3, 2, 0, 3); } } void setState(int ns) { gameState = ns; switch (gameState) { case INITIALIZED: addCommand(cmd[CMD_ABOUT]); removeCommand(cmd[CMD_RESET]); addCommand(cmd[CMD_START]); addCommand(cmd[CMD_UNLOCK]); addCommand(cmd[CMD_EXIT]); addCommand(cmd[CMD_OPTIONS]); break; case PLAYING: addCommand(cmd[CMD_ABOUT]); addCommand(cmd[CMD_RESET]); removeCommand(cmd[CMD_START]); removeCommand(cmd[CMD_UNLOCK]); addCommand(cmd[CMD_EXIT]); addCommand(cmd[CMD_OPTIONS]); break; case WON: addCommand(cmd[CMD_ABOUT]); removeCommand(cmd[CMD_RESET]); addCommand(cmd[CMD_START]); addCommand(cmd[CMD_UNLOCK]); addCommand(cmd[CMD_EXIT]); addCommand(cmd[CMD_OPTIONS]); break; } } public Board(MIDlet midlet_) { int i; midlet = midlet_; dpy = Display.getDisplay(midlet); gridw = 4; gridh = 4; font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM); cellw = font.charWidth('M') + 7; cellh = font.getHeight() + 1; cellxoff = 3; cellyoff = 0; gridx = (getWidth() - (gridw * cellw) + 1) / 2; gridy = 10; cheated = false; rand = new Random(); //创建单元格数组 grid = new Piece[gridw][]; for (i = 0; i < gridw; i++) { grid[i] = new Piece[gridh]; } all = new Piece[gridw * gridh]; for (i = 0; i < (gridw * gridh) - 1; i++) { int x = i % gridw; int y = i / gridw; String s = letters.substring(i, i + 1); grid[x][y] = all[i] = new Piece(s, i, x, y, i < (gridw * gridh / 2)); } //生成空白格 blankp = new Piece(null, gridw * gridh - 1, gridw - 1, gridh - 1, false); grid[gridw - 1][gridh - 1] = blankp; all[gridw * gridh - 1] = blankp;