javaswing随机数

生成随机数可以使用Java中的Random类。以下是使用Java Swing生成随机数的示例代码：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class RandomNumberGenerator extends JFrame implements ActionListener {
    private JButton generateButton;
    private JLabel randomNumberLabel;

    public RandomNumberGenerator() {
        setTitle("Random Number Generator");
        setSize(300, 100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        generateButton = new JButton("Generate");
        generateButton.addActionListener(this);
        panel.add(generateButton);

        randomNumberLabel = new JLabel();
        panel.add(randomNumberLabel);

        add(panel);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == generateButton) {
            int randomNumber = (int) (Math.random() * 100);
            randomNumberLabel.setText("Random Number: " + randomNumber);
        }
    }

    public static void main(String[] args) {
        RandomNumberGenerator rng = new RandomNumberGenerator();
        rng.setVisible(true);
    }
}

在这个示例中，当用户点击“生成”按钮时，将会生成一个0-99之间的随机数，并将其显示在标签上。