Java编写俄罗斯方块代码是什么

以下是一个简单的 Java 俄罗斯方块游戏的代码示例，仅供参考：

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

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

public class Tetris extends JPanel {

    private static final long serialVersionUID = -8715353373678321308L;

    enum Tile {
        NoShape(new int[][] { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } }),
        ZShape(new int[][] { { 0, -1 }, { 0, 0 }, { -1, 0 }, { -1, 1 } }),
        SShape(new int[][] { { 0, -1 }, { 0, 0 }, { 1, 0 }, { 1, 1 } }),
        LineShape(new int[][] { { 0, -1 }, { 0, 0 }, { 0, 1 }, { 0, 2 } }),
        TShape(new int[][] { { -1, 0 }, { 0, 0 }, { 1, 0 }, { 0, 1 } }),
        SquareShape(new int[][] { { 0, 0 }, { 0, 1 }, { 1, 0 }, { 1, 1 } }),
        LShape(new int[][] { { -1, -1 }, { 0, -1 }, { 0, 0 }, { 0, 1 } }),
        MirroredLShape(new int[][] { { 1, -1 }, { 0, -1 }, { 0, 0 }, { 0, 1 } });

        private int[][] coords;

        private Tile(int[][] coords) {
            this.coords = coords;
        }
    }

    private ArrayList<Point> tiles = new ArrayList<Point>();

    private Tile currentTile;
    private int[][][] coordsTable;

    private Random rand = new Random();

    private int deltaX = 0;
    private int score = 0;

    private long time;

    private boolean gameOver = false;
    private final int squareWidth = 30;

    public Tetris() {
        setPreferredSize(new Dimension(200, 400));
        initCoordsTable();
        newTile();
        time = System.currentTimeMillis();
        Timer timer = new Timer(50, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                update();
                repaint();
            }
        });
        timer.start();
    }

    void initCoordsTable() {
        coordsTable = new int[Tile.values().length][4][2];
        for (int i = 0; i < Tile.values().length; ++i) {
            for (int j = 0; j < 4; ++j) {
                coordsTable[i][j][0] = Tile.values()[i].coords[j][0];
                coordsTable[i][j][1] = Tile.values()[i].coords[j][1];
            }
        }
    }

    public void newTile() {
        int i = rand.nextInt(7) + 1;
        currentTile = Tile.values()[i];
        tiles.clear();
        for (int[] arr : currentTile.coords) {
            tiles.add(new Point(arr[0] + 5, arr[1]));
        }
        deltaX = 0;
    }

    public void update() {
        long newTime = System.currentTimeMillis();
        if (move(0, 1)) {
            if (newTime - time > 500) {
                newTile();
            }
        } else {
            for (Point p : tiles) {
                if (p.y < 2) {
                    gameOver = true;
                    return;
                }
            }
            checkLine();
            newTile();
        }
        time = newTime;
    }

    public boolean move(int dx, int dy) {
        for (Point p : tiles) {
            int newX = p.x + dx + deltaX;
            int newY = p.y + dy;
            if (newX < 1 || newX > 10 || newY < 1 || newY > 20) {
                return false;
            }
            if (tiles.contains(new Point(newX, newY))) {
                return false;
            }
        }
        for (Point p : tiles) {
            p.x += dx + deltaX;
            p.y += dy;
        }
        repaint();
        return true;
    }

    public void rotate() {
        if (currentTile == Tile.SquareShape) {
            return;
        }
        ArrayList<Point> newTiles = new ArrayList<Point>();
        for (Point p : tiles) {
            newTiles.add(new Point(-p.y, p.x));
        }
        for (Point p : newTiles) {
            int newX = p.x + currentTile.coords[0][0] + deltaX;
            int newY = p.y + currentTile.coords[0][1];
            if (newX < 1 || newX > 10 || newY < 1 || newY > 20) {
                return;
            }
        }
        tiles = newTiles;
        repaint();
    }

    public void checkLine() {
        ArrayList<Integer> fullLines = new ArrayList<Integer>();
        for (int i = 1; i <= 20; ++i) {
            int count = 0;
            for (Point p : tiles) {
                if (p.y == i) {
                    count++;
                }
            }
            if (count == 10) {
                fullLines.add(i);
            }
        }
        score += fullLines.size() * 10;
        for (int i : fullLines) {
            for (int j = 0; j < tiles.size(); ++j) {
                if (tiles.get(j).y == i) {
                    tiles.remove(j);
                }
            }
            for (int j = 0; j < tiles.size(); ++j) {
                if (tiles.get(j).y < i) {
                    tiles.get(j).y += 1;
                }
            }
        }
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawRect(0, 0, 100, 200);
        for (Point p : tiles) {
            g.setColor(Color.RED);
            g.fillRect(p.x * squareWidth, (p.y - 2) * squareWidth, squareWidth, squareWidth);
        }
        for (int i = 0; i < 11; ++i) {
            g.drawLine(i * squareWidth, 0, i * squareWidth, 400);
        }
        for (int i = 0; i < 21; ++i) {
            g.drawLine(0, i * squareWidth, 200, i * squareWidth);
        }
        g.drawString("Score: " + score, 10, 220);
        if (gameOver) {
            g.drawString("Game Over!", 50, 100);
        }
    }

    public static void main(String[] args) {
        JFrame f = new JFrame("Tetris");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(200, 400);
        f.add(new Tetris());
        f.setVisible(true);
    }
}