如何在JLabel中顯示和計算亂數？-有解無憂

我正在嘗試創建一個程式，我可以在其中計算 2 個隨機生成的數字并將它們顯示在JLabel. 該程式成功地在 a 中顯示亂數，JLabel但它只計算已生成的第一組數字。

我希望它能夠計算隨機生成的所有數字集。

Random dice = new Random();
boolean solution;
JLabel num1,num2,checker;
int calculation;

public void repeatLoop() {
    switch(calculation) {
    case 1:
        int addition1 = Integer.valueOf(num1.getText())   Integer.valueOf(num2.getText());
        break;
    case 2:
        num1.setText("");
        num2.setText("");
        break;
    case 3:
        num1.setText(String.valueOf(1   dice.nextInt(6)));
        num2.setText(String.valueOf(1   dice.nextInt(6)));
        break;
    }
}

public JLabel checkerLabel() {
    JLabel checker = new JLabel("");
    checker.setFont(new Font("Tahoma", Font.BOLD, 13));
    checker.setForeground(Color.GREEN);
    checker.setHorizontalAlignment(SwingConstants.CENTER);
    checker.setBounds(163, 21, 109, 23);
    contentPane.add(checker);
    return checker;
}

public addFrame() {
    JLabel num1 = new JLabel("3");
    num1.setHorizontalAlignment(SwingConstants.CENTER);
    num1.setFont(new Font("Tahoma", Font.PLAIN, 20));
    num1.setBounds(122, 101, 63, 32);
    contentPane.add(num1);

    JLabel num2 = new JLabel("4");
    num2.setHorizontalAlignment(SwingConstants.CENTER);
    num2.setFont(new Font("Tahoma", Font.PLAIN, 20));
    num2.setBounds(268, 101, 63, 32);
    contentPane.add(num2);

    this.num1 = num1;
    this.num2 = num2;
    calculation = 3;
    int addition1 = Integer.valueOf(num1.getText())   Integer.valueOf(num2.getText());
    JLabel addOperation = new JLabel(" ");
    addOperation.setHorizontalAlignment(SwingConstants.CENTER);
    addOperation.setFont(new Font("Tahoma", Font.PLAIN, 20));
    addOperation.setBounds(195, 101, 63, 32);
    contentPane.add(addOperation);

    this.checker = checkerLabel();

    textField1 = new JTextField();
    textField1.setHorizontalAlignment(SwingConstants.CENTER);
    textField1.setBounds(163, 155, 120, 32);
    contentPane.add(textField1);
    textField1.setColumns(10);

    JButton checkBtn1 = new JButton("Check");
    checkBtn1.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent e) {
            final int addition2 = addition1;
            int ansUser = Integer.parseInt(textField1.getText());
            if(addition2 == ansUser) {
                solution = true;
            } else {
                solution = false;
            }
            if(solution == true) {
                checker.setText("CORRECT");
                checker.setForeground(Color.GREEN);
            } else {
                checker.setText("WRONG");
                checker.setForeground(Color.RED);
            }
            textField1.setText("");
            calculation = 1;
            calculation = 2;
            repeatLoop();
        }
    });
}

uj5u.com熱心網友回復：

您的代碼中有一些邏輯錯誤。我相信我已經在下面的代碼中修復了它們。

我建議您運行以下代碼以確保其行為符合您的要求。如果確實如此，則將其與您的代碼進行比較以查看差異。沒有很多。這是一個摘要：

我做addition1了一個班員。
我在方法的陳述句中添加了一條break陳述句。switchrepeatLoop
我改變了最后幾行方法actionPerformed。

最后，我建議你用除錯器運行你的原始代碼，看看你的代碼為什么會出現邏輯問題。

這是代碼。

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.Color;
import java.util.Random;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class addFrame extends JFrame {

    private JPanel contentPane;
    private JTextField textField1;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    addFrame frame = new addFrame();
                    frame.setVisible(true);
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    Random dice = new Random();
    boolean solution;
    JLabel num1, num2, checker;
    int calculation;
    int addition1;

    public void repeatLoop() {
        switch (calculation) {
            case 1:
                addition1 = Integer.valueOf(num1.getText())   Integer.valueOf(num2.getText());
                break;
            case 2:
                num1.setText("");
                num2.setText("");
            case 3:
                num1.setText(String.valueOf(1   dice.nextInt(6)));
                num2.setText(String.valueOf(1   dice.nextInt(6)));
        }
    }

    public JLabel checkerLabel() {
        JLabel checker = new JLabel("");
        checker.setFont(new Font("Tahoma", Font.BOLD, 13));
        checker.setForeground(Color.GREEN);
        checker.setHorizontalAlignment(SwingConstants.CENTER);
        checker.setBounds(163, 21, 109, 23);
        contentPane.add(checker);
        return checker;
    }

    public addFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel title3 = new JLabel("ADDITION");
        title3.setForeground(Color.RED);
        title3.setFont(new Font("Verdana", Font.PLAIN, 30));
        title3.setHorizontalAlignment(SwingConstants.CENTER);
        title3.setBounds(108, 47, 224, 32);
        contentPane.add(title3);

        JLabel num1 = new JLabel("3");
        num1.setHorizontalAlignment(SwingConstants.CENTER);
        num1.setFont(new Font("Tahoma", Font.PLAIN, 20));
        num1.setBounds(122, 101, 63, 32);
        contentPane.add(num1);

        JLabel num2 = new JLabel("4");
        num2.setHorizontalAlignment(SwingConstants.CENTER);
        num2.setFont(new Font("Tahoma", Font.PLAIN, 20));
        num2.setBounds(268, 101, 63, 32);
        contentPane.add(num2);

        this.num1 = num1;
        this.num2 = num2;
        calculation = 3;
        addition1 = Integer.valueOf(num1.getText())   Integer.valueOf(num2.getText());
        JLabel addOperation = new JLabel(" ");
        addOperation.setHorizontalAlignment(SwingConstants.CENTER);
        addOperation.setFont(new Font("Tahoma", Font.PLAIN, 20));
        addOperation.setBounds(195, 101, 63, 32);
        contentPane.add(addOperation);

        this.checker = checkerLabel();

        textField1 = new JTextField();
        textField1.setHorizontalAlignment(SwingConstants.CENTER);
        textField1.setBounds(163, 155, 120, 32);
        contentPane.add(textField1);
        textField1.setColumns(10);

        JButton checkBtn1 = new JButton("Check");
        checkBtn1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                final int addition2 = addition1;
                int ansUser = Integer.parseInt(textField1.getText());
                if (addition2 == ansUser) {
                    solution = true;
                }
                else {
                    solution = false;
                }
                if (solution == true) {
                    checker.setText("CORRECT");
                    checker.setForeground(Color.GREEN);
                }
                else {
                    checker.setText("WRONG");
                    checker.setForeground(Color.RED);
                }
                textField1.setText("");
                calculation = 2;
                repeatLoop();
                calculation = 1;
                repeatLoop();
            }
        });
        checkBtn1.setBounds(183, 211, 89, 23);
        contentPane.add(checkBtn1);
        setLocationRelativeTo(null);
    }
}

uj5u.com熱心網友回復：

也許您應該break在結構中的每個案例之后添加switch(calculation) 。

嘗試將 switch 陳述句修改為：

switch(calculation) {
   case 1:
        int addition1 = Integer.valueOf(num1.getText())   Integer.valueOf(num2.getText());
        break;
   case 2:
        num1.setText("");
        num2.setText("");
        break;
   case 3:
        num1.setText(String.valueOf(1   dice.nextInt(6)));
        num2.setText(String.valueOf(1   dice.nextInt(6)));
        break;
}

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