Java俄罗斯方块代码

以下是一个简单的Java俄罗斯方块游戏示例代码：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

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

public class Tetris extends JPanel implements ActionListener {

    private static final long serialVersionUID = 1L;

    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(1, 1), new Point(0, 2), new Point(1, 2), new Point(0, 3) },
                { new Point(0, 0), new Point(1, 0), new Point(1, 1), new Point(2, 1) },
                { new Point(1, 1), new Point(0, 2), new Point(1, 2), new Point(0, 3) }
            }
    };

    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 nextPiece;
    private Point[][] currentRotation;
    private ArrayList<Integer> nextPieces = new ArrayList<Integer>();

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

    // Creates a border around the well and initializes the dropping piece
    private void init() {
        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();
    }

    // Put a new, random piece into the dropping position
    public void newPiece() {
        pieceOrigin = new Point(5, 2);
        if (nextPieces.isEmpty()) {
            Collections.addAll(nextPieces, 0, 1, 2, 3, 4, 5, 6);
            Collections.shuffle(nextPieces);
        }
        currentPiece = nextPieces.get(0);
        nextPieces.remove(0);
        nextPiece = nextPieces.get(0);
        currentRotation = Tetraminos[currentPiece][0];
        // If the game is over, reset the score and well
        if (collision()) {
            score = 0;
            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;
                    }
                }
            }
        }
    }

    // Collision test for the dropping piece
    private boolean collision() {
        for (Point p : currentRotation) {
            if (well[p.x + pieceOrigin.x][p.y + pieceOrigin.y] != Color.BLACK) {
                return true;
            }
        }
        return false;
    }

    // Rotate the piece clockwise or counterclockwise
    public void rotatePiece(int i) {
        int newRotation = (i == 1) ? 0 : 3;
        Point[][] rotated = Tetraminos[currentPiece][newRotation];
        if (collidesAt(rotated, pieceOrigin.x, pieceOrigin.y)) {
            // Do nothing if the piece is rotating into a collision
            return;
        }
        currentRotation = rotated;
    }

    // Move the piece left or right
    public void movePiece(int i) {
        if (!collidesAt(currentRotation, pieceOrigin.x + i, pieceOrigin.y)) {
            pieceOrigin.x += i;    
        }
    }

    // Drops the piece one line or fixes it to the well if it can't drop
    public void dropPiece() {
        if (!collidesAt(currentRotation, pieceOrigin.x, pieceOrigin.y + 1)) {
            pieceOrigin.y += 1;
        } else {
            fixToWell();
        }
    }

    // Make the dropping piece part of the well, so it is available for
    // collision detection.
    public void fixToWell() {
        for (Point p : currentRotation) {
            well[p.x + pieceOrigin.x][p.y + pieceOrigin.y] = tetraminoColors[currentPiece];
        }
        clearRows();
        newPiece();
    }

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

    // Clear completed rows from the field and award score according to
    // the number of simultaneously cleared rows.
    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) {
                removeRow(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;
        }
    }

    // Remove a given row from the field
    public void removeRow(int row) {
        for (int j = row-1; j > 0; j--) {
            for (int i = 1; i < 11; i++) {
                well[i][j+1] = well[i][j];
            }
        }
    }

    @Override 
    public void paintComponent(Graphics g)
    {
        // Paint 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
        for (Point p : currentRotation) {
            g.setColor(tetraminoColors[currentPiece]);
            g.fillRect((p.x + pieceOrigin.x) * 26, 
                       (p.y + pieceOrigin.y) * 26, 
                       25, 25);
        }
    }

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

        final Tetris game = new Tetris();
        game.init();
        f.add(game);

        // Keyboard controls
        f.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent e) {
                switch (e.getKeyCode()) {
                case java.awt.event.KeyEvent.VK_UP:
                    game.rotatePiece(1);
                    break;
                case java.awt.event.KeyEvent.VK_DOWN:
                    game.dropPiece();
                    game.score += 1;
                    break;
                case java.awt.event.KeyEvent.VK_LEFT:
                    game.movePiece(-1);
                    break;
                case java.awt.event.KeyEvent.VK_RIGHT:
                    game.movePiece(+1);
                    break;
                case java.awt.event.KeyEvent.VK_SPACE:
                    game.dropPiece();
                    game.score += 2;
                    break;
                }
            }
        });

        // Make the falling piece drop every second
        new Timer(1000, game).start();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        dropPiece();
    }
}

这个示例代码实现了一个基本的俄罗斯方块游戏，包括旋转、移动、下落、消除、得分等功能。您可以尝试运行它并自行扩展改进。