小学算术运算测试程序java_Java实现小学四则运算练习系统（UI）

以下是一个简单的小学四则运算练习系统的Java实现，带有UI界面：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ArithmeticPractice extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JLabel num1Label, num2Label, operatorLabel, resultLabel, feedbackLabel;
    private JTextField resultField;
    private JButton submitButton, nextButton, quitButton;
    private JPanel questionPanel, inputPanel, buttonPanel;

    private Random random = new Random();
    private int num1, num2, result, operator;

    public ArithmeticPractice() {
        super("小学四则运算练习系统");

        // 初始化题目
        generateQuestion();

        // 初始化UI组件
        num1Label = new JLabel(Integer.toString(num1));
        num2Label = new JLabel(Integer.toString(num2));
        operatorLabel = new JLabel(getOperatorSymbol(operator));
        resultLabel = new JLabel("=");
        feedbackLabel = new JLabel(" ");

        num1Label.setFont(new Font("Arial", Font.BOLD, 48));
        num2Label.setFont(new Font("Arial", Font.BOLD, 48));
        operatorLabel.setFont(new Font("Arial", Font.BOLD, 48));
        resultLabel.setFont(new Font("Arial", Font.BOLD, 48));
        feedbackLabel.setFont(new Font("Arial", Font.BOLD, 24));

        resultField = new JTextField(5);
        resultField.setFont(new Font("Arial", Font.BOLD, 48));

        submitButton = new JButton("提交");
        nextButton = new JButton("下一题");
        quitButton = new JButton("退出");

        submitButton.addActionListener(this);
        nextButton.addActionListener(this);
        quitButton.addActionListener(this);

        questionPanel = new JPanel(new FlowLayout());
        questionPanel.add(num1Label);
        questionPanel.add(operatorLabel);
        questionPanel.add(num2Label);
        questionPanel.add(resultLabel);

        inputPanel = new JPanel(new FlowLayout());
        inputPanel.add(resultField);

        buttonPanel = new JPanel(new GridLayout(1, 3));
        buttonPanel.add(submitButton);
        buttonPanel.add(nextButton);
        buttonPanel.add(quitButton);

        JPanel feedbackPanel = new JPanel(new FlowLayout());
        feedbackPanel.add(feedbackLabel);

        JPanel contentPanel = new JPanel(new BorderLayout());
        contentPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
        contentPanel.add(questionPanel, BorderLayout.NORTH);
        contentPanel.add(inputPanel, BorderLayout.CENTER);
        contentPanel.add(buttonPanel, BorderLayout.SOUTH);
        contentPanel.add(feedbackPanel, BorderLayout.PAGE_END);

        setContentPane(contentPanel);
        setSize(600, 300);
        setLocationRelativeTo(null);
    }

    private void generateQuestion() {
        num1 = random.nextInt(100) + 1;
        num2 = random.nextInt(100) + 1;
        operator = random.nextInt(4);
        switch (operator) {
        case 0:
            result = num1 + num2;
            break;
        case 1:
            result = num1 - num2;
            break;
        case 2:
            result = num1 * num2;
            break;
        case 3:
            result = num1 / num2;
            num1 = result * num2; // 保证除法结果是整数
            break;
        }
    }

    private String getOperatorSymbol(int operator) {
        switch (operator) {
        case 0:
            return "+";
        case 1:
            return "-";
        case 2:
            return "×";
        case 3:
            return "÷";
        default:
            return "";
        }
    }

    private void checkAnswer() {
        try {
            int answer = Integer.parseInt(resultField.getText());
            if (answer == result) {
                feedbackLabel.setForeground(Color.GREEN);
                feedbackLabel.setText("回答正确！");
            } else {
                feedbackLabel.setForeground(Color.RED);
                feedbackLabel.setText("回答错误，正确答案是：" + result);
            }
        } catch (NumberFormatException e) {
            feedbackLabel.setForeground(Color.RED);
            feedbackLabel.setText("请输入一个整数！");
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == submitButton) {
            checkAnswer();
        } else if (e.getSource() == nextButton) {
            generateQuestion();
            num1Label.setText(Integer.toString(num1));
            num2Label.setText(Integer.toString(num2));
            operatorLabel.setText(getOperatorSymbol(operator));
            feedbackLabel.setText("");
            resultField.setText("");
            resultField.requestFocus();
        } else if (e.getSource() == quitButton) {
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        ArithmeticPractice app = new ArithmeticPractice();
        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        app.setVisible(true);
    }

}

这个程序使用了Java Swing库实现了一个简单的UI界面。每次打开程序会随机生成一道题目，你需要在文本框中输入你的答案，然后点击“提交”按钮进行检查。如果答案正确，会在下方的反馈栏中显示“回答正确！”，否则会显示正确答案。点击“下一题”按钮会生成新的题目，点击“退出”按钮可以退出程序。