用java写一个俄罗斯方块小游戏

要用Java写一个俄罗斯方块小游戏，可以按照以下步骤进行：

1. 创建一个Java项目，并添加必要的库文件。
2. 创建一个游戏窗口，可以使用Java Swing或JavaFX等GUI库。
3. 实现俄罗斯方块的基本逻辑，包括方块的生成、下落、旋转、移动等操作。
4. 实现游戏的计分、等级、速度等功能。
5. 添加游戏音效和背景音乐。
6. 测试游戏并进行调试。

以下是一个简单的示例代码，可以作为参考：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Tetris extends JPanel implements ActionListener, KeyListener {
    private static final long serialVersionUID = 1L;

    private static final int WIDTH = 300;
    private static final int HEIGHT = 600;
    private static final int BLOCK_SIZE = 30;

    private int[][] board = new int[20][10];
    private int[][][] shapes = {
            {{1, 1, 1, 1}}, // I
            {{1, 1, 0}, {0, 1, 1}}, // Z
            {{0, 1, 1}, {1, 1, 0}}, // S
            {{1, 1, 1}, {0, 1, 0}}, // T
            {{1, 1, 1}, {1, 0, 0}}, // L
            {{1, 1, 1}, {0, 0, 1}}, // J
            {{1, 1}, {1, 1}} // O
    };
    private Color[] colors = {
            Color.CYAN, Color.RED, Color.GREEN, Color.MAGENTA, Color.ORANGE, Color.BLUE, Color.YELLOW
    };
    private int currentShape;
    private int currentX;
    private int currentY;
    private Timer timer;
    private boolean isGameOver;

    public Tetris() {
        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        setBackground(Color.WHITE);
        addKeyListener(this);
        timer = new Timer(500, this);
        timer.start();
        newShape();
    }

    private void newShape() {
        currentShape = new Random().nextInt(shapes.length);
        currentX = 4;
        currentY = 0;
        if (!isValidMove(currentShape, currentX, currentY)) {
            isGameOver = true;
            timer.stop();
        }
    }

    private boolean isValidMove(int shape, int x, int y) {
        int[][] current = shapes[shape];
        for (int i = 0; i < current.length; i++) {
            for (int j = 0; j < current[i].length; j++) {
                if (current[i][j] != 0 && (y + i >= board.length || x + j < 0 || x + j >= board[0].length || board[y + i][x + j] != 0)) {
                    return false;
                }
            }
        }
        return true;
    }

    private void move(int dx, int dy) {
        if (!isValidMove(currentShape, currentX + dx, currentY + dy)) {
            return;
        }
        currentX += dx;
        currentY += dy;
        repaint();
    }

    private void rotate() {
        int[][] current = shapes[currentShape];
        int[][] rotated = new int[current[0].length][current.length];
        for (int i = 0; i < current.length; i++) {
            for (int j = 0; j < current[i].length; j++) {
                rotated[j][current.length - 1 - i] = current[i][j];
            }
        }
        if (isValidMove(currentShape, currentX, currentY, rotated)) {
            shapes[currentShape] = rotated;
            repaint();
        }
    }

    private boolean isValidMove(int shape, int x, int y, int[][] rotated) {
        for (int i = 0; i < rotated.length; i++) {
            for (int j = 0; j < rotated[i].length; j++) {
                if (rotated[i][j] != 0 && (y + i >= board.length || x + j < 0 || x + j >= board[0].length || board[y + i][x + j] != 0)) {
                    return false;
                }
            }
        }
        return true;
    }

    private void drop() {
        while (isValidMove(currentShape, currentX, currentY + 1)) {
            currentY++;
        }
        place();
    }

    private void place() {
        int[][] current = shapes[currentShape];
        for (int i = 0; i < current.length; i++) {
            for (int j = 0; j < current[i].length; j++) {
                if (current[i][j] != 0) {
                    board[currentY + i][currentX + j] = currentShape + 1;
                }
            }
        }
        checkLines();
        newShape();
    }

    private void checkLines() {
        int lines = 0;
        for (int i = board.length - 1; i >= 0; i--) {
            boolean isLine = true;
            for (int j = 0; j < board[i].length; j++) {
                if (board[i][j] == 0) {
                    isLine = false;
                    break;
                }
            }
            if (isLine) {
                lines++;
                for (int k = i; k > 0; k--) {
                    System.arraycopy(board[k - 1], 0, board[k], 0, board[k].length);
                }
                for (int j = 0; j < board[0].length; j++) {
                    board[0][j] = 0;
                }
            }
        }
        if (lines > 0) {
            // update score, level, speed, etc.
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (isGameOver) {
            return;
        }
        if (isValidMove(currentShape, currentX, currentY + 1)) {
            currentY++;
        } else {
            place();
        }
        repaint();
    }

    @Override
    public void keyPressed(KeyEvent e) {
        switch (e.getKeyCode()) {
            case KeyEvent.VK_LEFT:
                move(-1, 0);
                break;
            case KeyEvent.VK_RIGHT:
                move(1, 0);
                break;
            case KeyEvent.VK_DOWN:
                move(0, 1);
                break;
            case KeyEvent.VK_UP:
                rotate();
                break;
            case KeyEvent.VK_SPACE:
                drop();
                break;
        }
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                if (board[i][j] != 0) {
                    g.setColor(colors[board[i][j] - 1]);
                    g.fillRect(j * BLOCK_SIZE, i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE);
                    g.setColor(Color.BLACK);
                    g.drawRect(j * BLOCK_SIZE, i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE);
                }
            }
        }
        int[][] current = shapes[currentShape];
        for (int i = 0; i < current.length; i++) {
            for (int j = 0; j < current[i].length; j++) {
                if (current[i][j] != 0) {
                    g.setColor(colors[currentShape]);
                    g.fillRect((currentX + j) * BLOCK_SIZE, (currentY + i) * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE);
                    g.setColor(Color.BLACK);
                    g.drawRect((currentX + j) * BLOCK_SIZE, (currentY + i) * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE);
                }
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Tetris");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.add(new Tetris());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}