java AWT 五子棋

Frame来绘图更新时会有闪烁，JFrame做为窗口，JPanel实现画图区可以避闪烁。

package javaAWT;import java.awt.CheckboxMenuItem;import java.awt.Dimension;import java.awt.Graphics;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionListener;import java.awt.image.BufferedImage;import java.io.File;import javax.imageio.ImageIO;import javax.swing.JFrame;import javax.swing.JPanel;public class Gobang {    // 定义代表棋盘，黑子，白子   位图    BufferedImage table;    BufferedImage black;    BufferedImage white;    //当鼠标移动时的选择框    BufferedImage selected;    // 棋盘大小,每行列棋子个数    private static int BOARD_SIZE = 15;    private final int TABLE_WIDTH = 535;    private final int TABLE_HEIGHT = 536;    // 定义棋盘坐标的像素值和棋盘数组之间的比率    private final int RATE = TABLE_WIDTH / BOARD_SIZE;    // 定义棋盘坐标的像素值和棋盘数组之间的偏移距离    private final int X_OFFSET = 5;    private final int Y_OFFSET = 6;    // 定义一个二维数组来充当棋盘    private String[][] board = new String[BOARD_SIZE][BOARD_SIZE];    // 游戏窗口    JFrame frame = new JFrame("Gobang");    // 棋盘对应的Canvase组件    ChessBoard chessBoard = new ChessBoard();    //当前选中点的坐标    private int selectedX = -1;    private int selectedY = -1;    public void init() throws Exception{        table = ImageIO.read(new File("image/board.jpg"));        black = ImageIO.read(new File("image/black.gif"));        white = ImageIO.read(new File("image/white.gif"));        selected = ImageIO.read(new File("image/selected.gif"));        // 把每个元素赋值为“+”，代表没有棋子        for(int i = 0; i < BOARD_SIZE; i++) {            for (int j = 0; j < BOARD_SIZE; j++) {                board[i][j] = "+";            }        }        chessBoard.setPreferredSize(new Dimension(TABLE_WIDTH, TABLE_HEIGHT));        chessBoard.addMouseListener(new MouseAdapter() {            @Override            public void mouseClicked(MouseEvent e) {                // TODO Auto-generated method stub                super.mouseClicked(e);                // 将用户鼠标事件的坐标转换成棋子数组的坐标                int xPos = (int)((e.getX() - X_OFFSET) / RATE);                int yPos = (int)((e.getY() - Y_OFFSET) / RATE);                board[xPos][yPos] = "o";                /*                 * 电脑随机生成两个整数，作为电脑下棋的坐标，                 * 1.如果下棋的点已经有棋子，不能重复下棋                 * 2.每次下棋后，需要扫描谁赢了                 * */                chessBoard.repaint();            }            // 当鼠标退出棋盘区后，复位选中点的坐标                          @Override            public void mouseExited(MouseEvent e) {                // TODO Auto-generated method stub                super.mouseExited(e);                selectedX = -1;                selectedY = -1;            }        });        chessBoard.addMouseMotionListener(new MouseMotionListener() {            @Override            public void mouseMoved(MouseEvent e) {                // TODO Auto-generated method stub                // 当鼠标移动时，改变选中点的坐标                selectedX = (e.getX() - X_OFFSET) / RATE;                selectedY = (e.getY() - Y_OFFSET) / RATE;                chessBoard.repaint();            }            @Override            public void mouseDragged(MouseEvent e) {                // TODO Auto-generated method stub            }        });        frame.add(chessBoard);        frame.pack();        frame.setVisible(true);    }    class ChessBoard extends JPanel {        //重写JPanel的paint方法，实现绘图        @Override        public void paint(Graphics g) {            // TODO Auto-generated method stub            super.paint(g);            // 绘制棋盘            g.drawImage(table, 0, 0, null);            // 绘制选中点的红框             if (selectedX >= 0 && selectedY >= 0) {                g.drawImage(selected, selectedX * RATE + X_OFFSET,                        selectedY * RATE + Y_OFFSET, null);            }            // 遍历数组，绘制棋子            for (int i = 0; i < BOARD_SIZE; i++) {                for(int j = 0; j < BOARD_SIZE; j++) {                    // 绘制黑棋                    if (board[i][j].equals("o")) {                        g.drawImage(black, i * RATE + X_OFFSET,                                 j * RATE + Y_OFFSET, null);                    }                    // 绘制白棋                    if (board[i][j].equals("O")) {                        g.drawImage(white, i * RATE + X_OFFSET,                                     j * RATE + Y_OFFSET, null);                    }                }            }        }    }    public static void main(String[] args) throws Exception {        Gobang gobang = new Gobang();        gobang.init();    }}