上传文件至 'src'

src/MathQuestion.java

@@ -0,0 +1,39 @@
+/**
+ * 数学题目类
+ * 存储题目表达式和答案
+ */
+public class MathQuestion {
+    private String expression;
+    private String answer;
+    
+    public MathQuestion(String expression, String answer) {
+        this.expression = expression;
+        this.answer = answer;
+    }
+    
+    public String getExpression() {
+        return expression;
+    }
+    
+    public String getAnswer() {
+        return answer;
+    }
+    
+    @Override
+    public String toString() {
+        return expression;
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        MathQuestion that = (MathQuestion) obj;
+        return expression.equals(that.expression);
+    }
+    
+    @Override
+    public int hashCode() {
+        return expression.hashCode();
+    }
+}