Java来实现编写一个图形界面程序实现自动投掷筛子100次的统计，在窗体中显示投掷过程，显 示投掷的值，每隔1秒投掷1次，点击投掷按钮开始投掷。 利用多线程实现自动投掷。最后，通过对话框显示投掷结果。 可增加一个按钮控制投掷过程的中止。中止时显示目前投掷的次数，各个值统计占比 情况

以下是Java实现自动投掷筛子100次的统计的代码：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class DiceRoller extends JFrame {

    private static final long serialVersionUID = 1L;
    private JButton btnRoll;
    private JButton btnStop;
    private JPanel panel;
    private JTextField tfResult;
    private JLabel[] lblValues;
    private JLabel[] lblPercentage;
    private int[] values;
    private int totalRolls;
    private boolean rolling;
    private Thread thread;

    public DiceRoller() {
        setTitle("Dice Roller");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        panel = new JPanel();
        btnRoll = new JButton("Roll Dice");
        btnRoll.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                rollDice();
            }
        });
        btnStop = new JButton("Stop Rolling");
        btnStop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stopRolling();
            }
        });
        tfResult = new JTextField(20);
        panel.add(btnRoll);
        panel.add(btnStop);
        panel.add(tfResult);
        add(panel, BorderLayout.NORTH);

        JPanel panelValues = new JPanel();
        panelValues.setLayout(new BorderLayout());
        panelValues.add(new JLabel("Value"), BorderLayout.WEST);
        panelValues.add(new JLabel("Percentage"), BorderLayout.EAST);
        panelValues.add(new JLabel(" "), BorderLayout.CENTER);
        lblValues = new JLabel[6];
        lblPercentage = new JLabel[6];
        values = new int[6];
        for (int i = 0; i < 6; i++) {
            values[i] = 0;
            lblValues[i] = new JLabel(String.valueOf(i + 1));
            lblPercentage[i] = new JLabel("0%");
            JPanel panelValue = new JPanel();
            panelValue.setLayout(new BorderLayout());
            panelValue.add(lblValues[i], BorderLayout.WEST);
            panelValue.add(lblPercentage[i], BorderLayout.EAST);
            panelValues.add(panelValue, BorderLayout.SOUTH);
        }
        add(panelValues, BorderLayout.CENTER);

        setVisible(true);
        rolling = false;
    }

    private void rollDice() {
        rolling = true;
        totalRolls = 0;
        for (int i = 0; i < 6; i++) {
            values[i] = 0;
        }
        thread = new Thread() {
            public void run() {
                Random rand = new Random();
                while (rolling) {
                    int value = rand.nextInt(6) + 1;
                    values[value - 1]++;
                    totalRolls++;
                    tfResult.setText(String.valueOf(value));
                    updatePercentage();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        };
        thread.start();
    }

    private void stopRolling() {
        rolling = false;
        thread.interrupt();
        String message = "Total Rolls: " + totalRolls + "\n";
        for (int i = 0; i < 6; i++) {
            double percentage = ((double) values[i] / totalRolls) * 100;
            message += "Value: " + (i + 1) + ", Count: " + values[i] + ", Percentage: " + String.format("%.2f", percentage) + "%\n";
        }
        JOptionPane.showMessageDialog(this, message);
    }

    private void updatePercentage() {
        for (int i = 0; i < 6; i++) {
            double percentage = ((double) values[i] / totalRolls) * 100;
            lblPercentage[i].setText(String.format("%.2f", percentage) + "%");
        }
    }

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

在该程序中，使用了多线程技术实现自动投掷筛子。点击“Roll Dice”按钮后，程序会启动一个新线程，在该线程中不断生成随机数模拟投掷筛子，并更新界面显示和统计结果。点击“Stop Rolling”按钮后，程序会中止投掷过程，并弹出一个对话框显示投掷结果。