用Java写一个俄罗斯方块

好的，以下是Java实现俄罗斯方块的代码示例：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.util.ArrayList;
import java.util.Random;

import javax.swing.JPanel;

public class Tetris extends JPanel implements Runnable {

    private static final long serialVersionUID = -8715353373678321308L;

    private final Point[][][] Tetraminos = {
            // I-Piece
            {
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(3, 1) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(1, 3) },
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(3, 1) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(1, 3) }
            },
            // J-Piece
            {
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(2, 0) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(2, 2) },
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(0, 2) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(0, 0) }
            },
            // L-Piece
            {
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(2, 2) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(0, 2) },
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(0, 0) },
                { new Point(1, 0), new Point(1, 1), new Point(1, 2), new Point(2, 0) }
            },
            // O-Piece
            {
                { new Point(0, 0), new Point(0, 1), new Point(1, 0), new Point(1, 1) },
                { new Point(0, 0), new Point(0, 1), new Point(1, 0), new Point(1, 1) },
                { new Point(0, 0), new Point(0, 1), new Point(1, 0), new Point(1, 1) },
                { new Point(0, 0), new Point(0, 1), new Point(1, 0), new Point(1, 1) }
            },
            // S-Piece
            {
                { new Point(1, 0), new Point(2, 0), new Point(0, 1), new Point(1, 1) },
                { new Point(0, 0), new Point(0, 1), new Point(1, 1), new Point(1, 2) },
                { new Point(1, 0), new Point(2, 0), new Point(0, 1), new Point(1, 1) },
                { new Point(0, 0), new Point(0, 1), new Point(1, 1), new Point(1, 2) }
            },
            // T-Piece
            {
                { new Point(1, 0), new Point(0, 1), new Point(1, 1), new Point(2, 1) },
                { new Point(1, 0), new Point(0, 1), new Point(1, 1), new Point(1, 2) },
                { new Point(0, 1), new Point(1, 1), new Point(2, 1), new Point(1, 2) },
                { new Point(1, 0), new Point(1, 1), new Point(2, 1), new Point(1, 2) }
            },
            // Z-Piece
            {
                { new Point(0, 0), new Point(1, 0), new Point(1, 1), new Point(2, 1) },
                { new Point(2, 0), new Point(1, 1), new Point(2, 1), new Point(1, 2) },
                { new Point(0, 0), new Point(1, 0), new Point(1, 1), new Point(2, 1) },
                { new Point(2, 0), new Point(1, 1), new Point(2, 1), new Point(1, 2) }
            }
        };

    private final Color[] tetraminoColors = {
        Color.cyan, Color.blue, Color.orange, Color.yellow, Color.green, Color.pink, Color.red
    };

    private Point pieceOrigin;
    private int currentPiece;
    private int rotation;
    private ArrayList<Integer> nextPieces = new ArrayList<Integer>();

    private long score;
    private Color[][] well;

    private boolean gameOver = false;
    private Thread gameThread;
    private final Object pauseLock = new Object();
    private boolean isPaused = false;

    public Tetris() {
        setPreferredSize(new Dimension(200, 400));
        setBackground(Color.BLACK);

        well = new Color[12][24];
        for (int i = 0; i < 12; i++) {
            for (int j = 0; j < 23; j++) {
                if (i == 0 || i == 11 || j == 22) {
                    well[i][j] = Color.GRAY;
                } else {
                    well[i][j] = Color.BLACK;
                }
            }
        }

        newPiece();
    }

    public void newPiece() {
        pieceOrigin = new Point(5, 2);
        rotation = 0;
        if (nextPieces.isEmpty()) {
            Collections.addAll(nextPieces, 0, 1, 2, 3, 4, 5, 6);
            Collections.shuffle(nextPieces);
        }
        currentPiece = nextPieces.get(0);
        nextPieces.remove(0);
    }

    private boolean collidesAt(int x, int y, int rotation) {
        for (Point p : Tetraminos[currentPiece][rotation]) {
            if (well[p.x + x][p.y + y] != Color.BLACK) {
                return true;
            }
        }
        return false;
    }

    public void rotate(int i) {
        int newRotation = (rotation + i) % 4;
        if (newRotation < 0) {
            newRotation = 3;
        }
        if (!collidesAt(pieceOrigin.x, pieceOrigin.y, newRotation)) {
            rotation = newRotation;
        }
        repaint();
    }

    public void move(int i) {
        if (!collidesAt(pieceOrigin.x + i, pieceOrigin.y, rotation)) {
            pieceOrigin.x += i;	
        }
        repaint();
    }

    public void dropDown() {
        if (!collidesAt(pieceOrigin.x, pieceOrigin.y + 1, rotation)) {
            pieceOrigin.y += 1;
        } else {
            fixToWell();
        }		
        repaint();
    }

    public void fixToWell() {
        for (Point p : Tetraminos[currentPiece][rotation]) {
            well[pieceOrigin.x + p.x][pieceOrigin.y + p.y] = tetraminoColors[currentPiece];
        }
        clearRows();
        newPiece();
        if (collidesAt(pieceOrigin.x, pieceOrigin.y, rotation)) {
            gameOver = true;
            pause();
        }
    }

    public void deleteRow(int row) {
        for (int j = row-1; j > 0; j--) {
            for (int i = 1; i < 11; i++) {
                well[i][j+1] = well[i][j];
            }
        }
    }

    public void clearRows() {
        boolean gap;
        int numClears = 0;

        for (int j = 21; j > 0; j--) {
            gap = false;
            for (int i = 1; i < 11; i++) {
                if (well[i][j] == Color.BLACK) {
                    gap = true;
                    break;
                }
            }
            if (!gap) {
                deleteRow(j);
                j += 1;
                numClears += 1;
            }
        }

        switch (numClears) {
        case 1:
            score += 100;
            break;
        case 2:
            score += 300;
            break;
        case 3:
            score += 500;
            break;
        case 4:
            score += 800;
            break;
        }
    }

    public void drawPiece(Graphics g) {
        g.setColor(tetraminoColors[currentPiece]);
        for (Point p : Tetraminos[currentPiece][rotation]) {
            g.fillRect((p.x + pieceOrigin.x) * 26, 
                       (p.y + pieceOrigin.y) * 26, 
                       25, 25);
        }
    }

    @Override 
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        // Draw the well
        g.fillRect(0, 0, 26*12, 26*23);
        for (int i = 0; i < 12; i++) {
            for (int j = 0; j < 23; j++) {
                g.setColor(well[i][j]);
                g.fillRect(26*i, 26*j, 25, 25);
            }
        }

        // Display the score
        g.setColor(Color.WHITE);
        g.drawString("" + score, 19*12, 25);

        // Draw the currently falling piece
        drawPiece(g);
    }

    public void pause() {
        isPaused = true;
    }

    public void resume() {
        synchronized (pauseLock) {
            isPaused = false;
            pauseLock.notifyAll();
        }
    }

    public void run() {
        while (!gameOver) {
            synchronized (pauseLock) {
                while (isPaused) {
                    try {
                        pauseLock.wait();
                    } catch (InterruptedException e) {
                    }
                }
            }
            dropDown();
            try {
                Thread.sleep(400);
            } catch ( InterruptedException e ) {}
        }
    }

    public static void main(String[] args) {
        Tetris game = new Tetris();
        JFrame f = new JFrame("Tetris");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(12*26+10, 26*23+25);
        f.add(game);
        f.setVisible(true);

        game.start();
    }

    public void start() {
        gameOver = false;
        score = 0;
        newPiece();
        gameThread = new Thread(this);
        gameThread.start();
    }
}

这个示例中，我们使用了Java的Swing来实现游戏界面，使用了多线程来控制游戏的运行。具体实现中，我们定义了方块的类型和颜色，以及游戏区域。游戏区域由一个二维数组表示，每一种方块都是由自己所在位置和相对位置组成的一个数组，通过不停地调整方块的位置和旋转来达到消除行的目的。