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法律研究用Java构建计算表达式游戏
任务是构建一个应用程序，该应用程序显示一个表达式并提示用户输入答案。一旦您输入解决方案，就会显示一个新的表达式，并且这些表达式会不断变化。在一定时间后，对各个应用程序给出的解决方案进行评估，并显示准确答案的总数。
游戏中的方法（用户定义）
本节将引导您了解实现中包含的方法（和构造函数）及其在“计算表达式游戏”中的作用。
CalculateExpressionGame()
这是 CalculateExpressionGame 类的构造函数。它通过创建和配置 Swing 组件（例如 JLabel、JTextField、JButton 和 JLabel）来设置游戏窗口，以显示表达式和结果。它还为提交按钮设置了动作监听器。
public CalculateExpressionGame() {
super("Calculate Expression Game");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
// Create and configure the Swing components
expressionLabel = new JLabel();
expressionLabel.setFont(new Font("Arial", Font.BOLD, 18));
add(expressionLabel);
answerTextField = new JTextField(10);
add(answerTextField);
submitButton = new JButton("Submit");
add(submitButton);
resultLabel = new JLabel();
resultLabel.setFont(new Font("Arial", Font.BOLD, 18));
add(resultLabel);
// Add an ActionListener to the Submit button
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
checkAnswer();
}
});
pack();
setLocationRelativeTo(null);
setVisible(true);
}
startGame(int timeLimit) 此方法通过初始化游戏变量（如 totalTime、numQuestions 和 numCorrect）来启动游戏。它调用 generateQuestion() 方法来显示第一个算术表达式。它还创建并启动一个计时器来跟踪剩余时间。如果时间用完，则调用 endGame() 方法。
public void startGame(int timeLimit) {
totalTime = timeLimit;
numQuestions = 0;
numCorrect = 0;
generateQuestion();
// Create and start a Timer to track the remaining time
timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
totalTime--;
if (totalTime >= 0) {
setTitle("Calculate Expression Game - Time: " + totalTime);
} else {
endGame();
}
}
});
timer.start();
}
generateQuestion()此方法通过生成随机数和运算符来生成随机算术表达式。它更新 expressionLabel 以显示生成的表达式，并清除 answerTextField 以供用户输入。它还会递增 numQuestions 计数器。
private void generateQuestion() {
// Generate random numbers and operator for the expression
int num1 = (int) (Math.random() * 10) + 1;
int num2 = (int) (Math.random() * 10) + 1;
int operatorIndex = (int) (Math.random() * 3);
String operator = "";
int result = 0;
// Determine the operator based on the randomly generated index
switch (operatorIndex) {
case 0:
operator = "+";
result = num1 + num2;
break;
case 1:
operator = "-";
result = num1 - num2;
break;
case 2:
operator = "*";
result = num1 * num2;
break;
}
checkAnswer()当用户单击提交按钮时，会调用此方法。它通过从 answerTextField 解析整数值来检查用户的答案。然后，它通过调用 evaluateExpression() 方法来评估 expressionLabel 中显示的表达式。如果用户的答案与计算结果匹配，则递增 numCorrect 计数器。之后，它调用 generateQuestion() 以生成一个新问题。
private void checkAnswer() {
try {
// Parse the user's answer from the text field
int userAnswer = Integer.parseInt(answerTextField.getText());
int result = evaluateExpression(expressionLabel.getText());
// Check if the user's answer is correct and update the count
if (userAnswer == result) {
numCorrect++;
}
} catch (NumberFormatException e) {
// Invalid answer format
}
// Generate a new question
generateQuestion();
}
evaluateExpression(String expression)此方法以字符串参数的形式接收算术表达式并对其进行评估以获得结果。它使用空格作为分隔符将表达式拆分为其组件（num1、operator、num2）。它将 num1 和 num2 转换为整数，并应用运算符执行算术运算。返回结果值。
private int evaluateExpression(String expression) {
// Split the expression into parts: num1, operator, num2
String[] parts = expression.split(" ");
int num1 = Integer.parseInt(parts[0]);
String operator = parts[1];
int num2 = Integer.parseInt(parts[2]);
int result = 0;
// Evaluate the expression based on the operator
switch (operator) {
case "+":
result = num1 + num2;
break;
case "-":
result = num1 - num2;
break;
case "*":
result = num1 * num2;
break;
}
return result;
}
endGame()当达到时间限制时，会调用此方法。它停止计时器并禁用提交按钮。它通过将 numCorrect 除以 numQuestions 并乘以 100 来计算准确率。最终结果将显示在 resultLabel 中，其中包含有关问题总数、正确答案数和准确率百分比的信息。
private void endGame() {
// Stop the timer and disable the submit button
timer.stop();
setTitle("Calculate Expression Game - Time's up!");
submitButton.setEnabled(false);
// Calculate the accuracy and display the final results
double accuracy = (double) numCorrect / numQuestions * 100;
resultLabel.setText("Game Over! Total Questions: " + numQuestions + " | Correct Answers: " + numCorrect + " | Accuracy: " + accuracy + "%");
}
main(String[] args)这是程序的入口点。它创建 CalculateExpressionGame 类的实例，设置游戏的时间限制（以秒为单位），并通过调用 startGame() 启动游戏。游戏在事件分派线程 (EDT) 上执行，以确保正确的 Swing UI 处理。
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
CalculateExpressionGame game = new CalculateExpressionGame();
game.startGame(60); // 60 seconds time limit
}
});
}
完整示例
以下是此游戏的完整实现：
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class CalculateExpressionGame extends JFrame {
private JLabel expressionLabel;
private JTextField answerTextField;
private JButton submitButton;
private JLabel resultLabel;
private Timer timer;
private int totalTime;
private int numQuestions;
private int numCorrect;
public CalculateExpressionGame() {
super("Calculate Expression Game");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
// Create and configure the Swing components
expressionLabel = new JLabel();
expressionLabel.setFont(new Font("Arial", Font.BOLD, 18));
add(expressionLabel);
answerTextField = new JTextField(10);
add(answerTextField);
submitButton = new JButton("Submit");
add(submitButton);
resultLabel = new JLabel();
resultLabel.setFont(new Font("Arial", Font.BOLD, 18));
add(resultLabel);
// Add an ActionListener to the Submit button
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
checkAnswer();
}
});
pack();
setLocationRelativeTo(null);
setVisible(true);
}
public void startGame(int timeLimit) {
totalTime = timeLimit;
numQuestions = 0;
numCorrect = 0;
generateQuestion();
// Create and start a Timer to track the remaining time
timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
totalTime--;
if (totalTime >= 0) {
setTitle("Calculate Expression Game - Time: " + totalTime);
} else {
endGame();
}
}
});
timer.start();
}
private void generateQuestion() {
// Generate random numbers and operator for the expression
int num1 = (int) (Math.random() * 10) + 1;
int num2 = (int) (Math.random() * 10) + 1;
int operatorIndex = (int) (Math.random() * 3);
String operator = "";
int result = 0;
// Determine the operator based on the randomly generated index
switch (operatorIndex) {
case 0:
operator = "+";
result = num1 + num2;
break;
case 1:
operator = "-";
result = num1 - num2;
break;
case 2:
operator = "*";
result = num1 * num2;
break;
}
// Update the expression label and clear the answer text field
expressionLabel.setText(num1 + " " + operator + " " + num2 + " = ");
answerTextField.setText("");
answerTextField.requestFocus();
numQuestions++;
}
private void checkAnswer() {
try {
// Parse the user's answer from the text field
int userAnswer = Integer.parseInt(answerTextField.getText());
int result = evaluateExpression(expressionLabel.getText());
// Check if the user's answer is correct and update the count
if (userAnswer == result) {
numCorrect++;
}
} catch (NumberFormatException e) {
// Invalid answer format
}
// Generate a new question
generateQuestion();
}
private int evaluateExpression(String expression) {
// Split the expression into parts: num1, operator, num2
String[] parts = expression.split(" ");
int num1 = Integer.parseInt(parts[0]);
String operator = parts[1];
int num2 = Integer.parseInt(parts[2]);
int result = 0;
// Evaluate the expression based on the operator
switch (operator) {
case "+":
result = num1 + num2;
break;
case "-":
result = num1 - num2;
break;
case "*":
result = num1 * num2;
break;
}
return result;
}
private void endGame() {
// Stop the timer and disable the submit button
timer.stop();
setTitle("Calculate Expression Game - Time's up!");
submitButton.setEnabled(false);
// Calculate the accuracy and display the final results
double accuracy = (double) numCorrect / numQuestions * 100;
resultLabel.setText("Game Over! Total Questions: " + numQuestions + " | Correct Answers: " + numCorrect
+ " | Accuracy: " + accuracy + "%");
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
CalculateExpressionGame game = new CalculateExpressionGame();
game.startGame(60); // 60 seconds time limit
}
});
}
}
输出
此程序使用 Java Swing 元素构建了一个简单的游戏窗口。它创建任意数学公式（+、- 和 *），并提示用户在设定的时间内（在本例中为 60 秒）提供正确答案。
用户可以提交他们的答案，游戏将记录算术问题的数量、正确答案的数量和准确率。在分配的时间结束后，游戏将显示结果。
要测试此代码的功能，请在 Eclipse 或 IntelliJ IDEA 等 Java 开发环境中运行它。
更新于： 2023年7月12日
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