用Java写一个切水果小游戏

好的，那我来给您提供一个简单的切水果小游戏的Java代码实现。

首先，我们需要导入Java的图形化界面库`javax.swing`以及其他必要的库：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

然后，我们需要定义一些全局变量，包括游戏窗口的大小、水果的数量和速度、得分等信息：

public class FruitNinja extends JFrame implements ActionListener {
    private final int WINDOW_WIDTH = 600;
    private final int WINDOW_HEIGHT = 600;
    private final int FRUIT_COUNT = 6;
    private final int FRUIT_SPEED = 10;
    private int score = 0;
    private JLabel scoreLabel;
    private Timer timer;
    private Random random;
    private final String[] FRUIT_NAMES = {"apple", "banana", "grape", "kiwi", "orange", "pear"};
    private JLabel[] fruitLabels = new JLabel[FRUIT_COUNT];
}

接下来，我们需要在`FruitNinja`类的构造函数中初始化游戏窗口、设置游戏得分标签等信息：

public FruitNinja() {
    setTitle("Fruit Ninja");
    setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(null);
    setBackground(Color.BLACK);

    scoreLabel = new JLabel("Score: " + score);
    scoreLabel.setForeground(Color.WHITE);
    scoreLabel.setBounds(10, 10, 100, 20);
    add(scoreLabel);

    random = new Random();
    timer = new Timer(1000 / FRUIT_SPEED, this);
    timer.start();

    setVisible(true);
}

然后，我们需要实现`actionPerformed`方法，用于处理游戏逻辑：

public void actionPerformed(ActionEvent e) {
    for (int i = 0; i < FRUIT_COUNT; i++) {
        if (fruitLabels[i] == null) {
            int x = random.nextInt(WINDOW_WIDTH - 50);
            int y = WINDOW_HEIGHT;
            int index = random.nextInt(FRUIT_NAMES.length);
            fruitLabels[i] = new JLabel(new ImageIcon(FRUIT_NAMES[index] + ".png"));
            fruitLabels[i].setBounds(x, y, 50, 50);
            add(fruitLabels[i]);
        } else {
            fruitLabels[i].setLocation(fruitLabels[i].getX(), fruitLabels[i].getY() - 10);
            if (fruitLabels[i].getY() < -50) {
                remove(fruitLabels[i]);
                fruitLabels[i] = null;
            }
        }
    }
    scoreLabel.setText("Score: " + score);
}

最后，我们需要在`main`方法中创建一个`FruitNinja`对象，即可启动游戏：

public static void main(String[] args) {
    new FruitNinja();
}

完整的代码实现如下所示：