import javax.swing.;
import java.awt.;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
class ArithmeticProblem {
private int[] operands;
char[] operators;
private int result;
public ArithmeticProblem(int numOperands) {
operands = new int[numOperands];
operators = new char[numOperands - 1];
generateProblem();
}
private void generateProblem() {
Random random = new Random();
for (int i = 0; i < operands.length; i++) {
operands[i] = random.nextInt(100);
}
for (int i = 0; i < operators.length; i++) {
int op = random.nextInt(4);
switch (op) {
case 0:
operators[i] = '+';
break;
case 1:
operators[i] = '-';
break;
case 2:
operators[i] = '*';
break;
case 3:
operators[i] = '/';
break;
}
}
result = calculateResult();
}
private int calculateResult() {
int tempResult = operands[0];
for (int i = 0; i < operators.length; i++) {
switch (operators[i]) {
case '+':
tempResult += operands[i + 1];
break;
case '-':
tempResult -= operands[i + 1];
break;
case '*':
tempResult *= operands[i + 1];
break;
case '/':
tempResult /= operands[i + 1];
break;
}
}
return tempResult;
}
public String getProblemString() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < operands.length; i++) {
sb.append(operands[i]);
if (i < operators.length) {
sb.append(" ").append(operators[i]).append(" ");
}
}
return sb.toString();
}
public int getResult() {
return result;
}
}
class GradeTwoProblem extends ArithmeticProblem {
public GradeTwoProblem(int numOperands) {
super(numOperands);
}
}
class GradeThreeProblem extends GradeTwoProblem {
public GradeThreeProblem(int numOperands) {
super(numOperands);
}
}
class GradeFourProblem extends GradeThreeProblem {
public GradeFourProblem() {
super(5);
addParentheses();
}
private void addParentheses() {
Random random = new Random();
if (random.nextBoolean()) {
int[] operands = new int[0];
int start = random.nextInt(operands.length - 1);
int end = start + random.nextInt(operands.length - start);
StringBuilder sb = new StringBuilder();
sb.append("(");
for (int i = start; i < end; i++) {
sb.append(operands[i]).append(" ").append(operators[i]).append(" ");
}
sb.deleteCharAt(sb.length() - 1);
sb.append(")");
for (int i = end; i < operands.length; i++) {
sb.append(operands[i]).append(" ").append(operators[i]).append(" ");
}
sb.deleteCharAt(sb.length() - 1);
String problemString = sb.toString();
operands = new int[problemString.length()];
operators = new char[problemString.length()];
int operandIndex = 0;
int operatorIndex = 0;
StringBuilder tempOperand = new StringBuilder();
for (int i = 0; i < problemString.length(); i++) {
char c = problemString.charAt(i);
if (Character.isDigit(c)) {
tempOperand.append(c);
} else if (c == '+' || c == '-' || c == '*' || c == '/') {
operands[operandIndex++] = Integer.parseInt(tempOperand.toString());
tempOperand = new StringBuilder();
operators[operatorIndex++] = c;
} else if (c == '(' || c == ')') {
// Ignore parentheses for now
}
}
operands[operandIndex] = Integer.parseInt(tempOperand.toString());
}
}
}
class ArithmeticTester {
private JFrame frame;
private JPanel panel;
private JTextField numProblemsField;
private JCheckBox hasMultiplicationCheckBox;
private JCheckBox hasDivisionCheckBox;
private JCheckBox hasParenthesesCheckBox;
private JButton generateButton;
private JButton submitButton;
private JComboBox
private JTextField numOperandsField;
private List
private List
private List
private int currentProblemIndex;
public ArithmeticTester() {
frame = new JFrame("四则运算测试器");
panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
numProblemsField = new JTextField(5);
hasMultiplicationCheckBox = new JCheckBox("有乘法");
hasDivisionCheckBox = new JCheckBox("有除法");
hasParenthesesCheckBox = new JCheckBox("有括号");
generateButton = new JButton("生成题目");
submitButton = new JButton("提交答案");
gradeComboBox = new JComboBox<>(new String[]{"二年级", "三年级", "四年级"});
numOperandsField = new JTextField(3);
problems = new ArrayList<>();
answerFields = new ArrayList<>();
wrongAnswers = new ArrayList<>();
currentProblemIndex = 0;
JPanel inputPanel = new JPanel();
inputPanel.add(new JLabel("题目数量："));
inputPanel.add(numProblemsField);
inputPanel.add(new JLabel("年级："));
inputPanel.add(gradeComboBox);
inputPanel.add(new JLabel("操作数个数："));
inputPanel.add(numOperandsField);
inputPanel.add(hasMultiplicationCheckBox);
inputPanel.add(hasDivisionCheckBox);
inputPanel.add(hasParenthesesCheckBox);
inputPanel.add(generateButton);
panel.add(inputPanel);
generateButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
generateProblems();
}
});
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
submitAnswers();
}
});
JPanel bottomPanel = new JPanel();
bottomPanel.add(submitButton);
frame.add(panel, BorderLayout.CENTER);
frame.add(bottomPanel, BorderLayout.SOUTH);
frame.setSize(400, 300);
frame.setVisible(true);
}
private void generateProblems() {
int numProblems = Integer.parseInt(numProblemsField.getText());
boolean hasMultiplication = hasMultiplicationCheckBox.isSelected();
boolean hasDivision = hasDivisionCheckBox.isSelected();
boolean hasParentheses = hasParenthesesCheckBox.isSelected();
String selectedGrade = (String) gradeComboBox.getSelectedItem();
int numOperands = Integer.parseInt(numOperandsField.getText());
problems.clear();
answerFields.clear();
for (int i = 0; i < numProblems; i++) {
ArithmeticProblem problem;
if (selectedGrade.equals("四年级") && hasParentheses && i % 3 == 0) {
problem = new GradeFourProblem();
} else if (selectedGrade.equals("三年级") && i % 2 == 0) {
problem = new GradeThreeProblem(numOperands);
} else if (selectedGrade.equals("二年级")) {
problem = new GradeTwoProblem(numOperands);
} else {
problem = new GradeTwoProblem(numOperands);
}
problems.add(problem);
JTextField answerField = new JTextField(5);
JPanel problemPanel = new JPanel();
problemPanel.setLayout(new BoxLayout(problemPanel, BoxLayout.X_AXIS));
problemPanel.add(Box.createHorizontalGlue());
JLabel problemLabel = new JLabel(problem.getProblemString() + " =");
problemPanel.add(problemLabel);
problemPanel.add(answerField);
problemPanel.add(Box.createHorizontalGlue());
panel.add(problemPanel);
answerFields.add(answerField);
}
panel.revalidate();
panel.repaint();
}
private void submitAnswers() {
int wrongCount = 0;
for (int i = 0; i < problems.size(); i++) {
int userAnswer = Integer.parseInt(answerFields.get(i).getText());
int correctAnswer = problems.get(i).getResult();
if (userAnswer!= correctAnswer) {
wrongCount++;
wrongAnswers.add(i);
}
}
JOptionPane.showMessageDialog(frame, "你答对了 " + (problems.size() - wrongCount) + " 道题，答错了 " + wrongCount + " 道题。");
if (wrongCount > 0) {
JButton retryButton = new JButton("重练错题");
JPanel retryPanel = new JPanel();
retryPanel.add(retryButton);
JOptionPane.showMessageDialog(frame, retryPanel, "重练错题", JOptionPane.PLAIN_MESSAGE);
retryButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
retryWrongAnswers();
}
});
} else {
JOptionPane.showMessageDialog(frame, "全部答对！");
}
}
private void retryWrongAnswers() {
problems.clear();
answerFields.clear();
int numProblems = wrongAnswers.size();
boolean hasMultiplication = hasMultiplicationCheckBox.isSelected();
boolean hasDivision = hasDivisionCheckBox.isSelected();
boolean hasParentheses = hasParenthesesCheckBox.isSelected();
String selectedGrade = (String) gradeComboBox.getSelectedItem();
int numOperands = Integer.parseInt(numOperandsField.getText());
JFrame newFrame = new JFrame("错题重练");
JPanel newPanel = new JPanel();
newPanel.setLayout(new BoxLayout(newPanel, BoxLayout.Y_AXIS));
for (int index : wrongAnswers) {
ArithmeticProblem problem;
if (selectedGrade.equals("四年级") && hasParentheses && index % 3 == 0) {
problem = new GradeFourProblem();
} else if (selectedGrade.equals("三年级") && index % 2 == 0) {
problem = new GradeThreeProblem(numOperands);
} else if (selectedGrade.equals("二年级")) {
problem = new GradeTwoProblem(numOperands);
} else {
problem = new GradeTwoProblem(numOperands);
}
problems.add(problem);
JTextField answerField = new JTextField(5);
JPanel problemPanel = new JPanel();
problemPanel.setLayout(new BoxLayout(problemPanel, BoxLayout.X_AXIS));
problemPanel.add(Box.createHorizontalGlue());
JLabel problemLabel = new JLabel(problem.getProblemString() + " =");
problemPanel.add(problemLabel);
problemPanel.add(answerField);
problemPanel.add(Box.createHorizontalGlue());
newPanel.add(problemPanel);
answerFields.add(answerField);
}
JButton newSubmitButton = new JButton("提交错题答案");
newPanel.add(newSubmitButton);
newSubmitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
submitWrongAnswers(newFrame, newPanel);
}
});
newFrame.add(newPanel);
newFrame.setSize(400, 300);
newFrame.setVisible(true);
}
private void submitWrongAnswers(JFrame frame, JPanel panel) {
int wrongCount = 0;
for (int i = 0; i < problems.size(); i++) {
int userAnswer = Integer.parseInt(answerFields.get(i).getText());
int correctAnswer = problems.get(i).getResult();
if (userAnswer!= correctAnswer) {
wrongCount++;
}
}
if (wrongCount > 0) {
JOptionPane.showMessageDialog(frame, "你还有 " + wrongCount + " 道题答错了。请继续努力。");
} else {
JOptionPane.showMessageDialog(frame, "全部答对！恭喜你。");
}
}
}
public class Main {
public static void main(String[] args) {
new ArithmeticTester();
}
}
实现了以下功能
1、可定制（数量）：输入大的出题数量值.
2、操作数的个数、是否有乘除法、是否有括号（随机加入）、数值范围（确定操作数的取值范围）；
3、实现错题集、错题重练并记录错题的次数功能。
4、可以同时定义小学二年级口算题、小学三年级口算题、小学四年级口算题。