Delete 'src/AbstractQuestionSeting.java'

src/AbstractQuestionSeting.java

@@ -1,46 +0,0 @@
-import java.util.Random;
-
-public abstract class AbstractQuestionSeting implements QuestionSeting{
-    static Random rand = new Random();
-
-    public String getRandOpe(){
-        String[] operators= {"+","-","*","/"};
-        int index = rand.nextInt(4);
-        return operators[index];
-    }
-    public String getRandnum(){
-        int num = rand.nextInt(1,100);
-        return String.valueOf(num);
-    }
-    // 定义运算符优先级
-    public int getPriority(String op) {
-        if (op == null) return -1; // 叶子节点（数字）
-        if (op.equals("+") || op.equals("-")) return 1;
-        if (op.equals("*") || op.equals("/")) return 2;
-        return 0;
-    }
-
-    public String addParenthesesIfNeeded(Expr child, String parentOp, boolean isRightChild) {
-        if (child.mainOperator == null) {
-            return child.expression; // 纯数字不用括号
-        }
-
-        int parentPriority = getPriority(parentOp);
-        int childPriority = getPriority(child.mainOperator);
-
-        // 子优先级 < 父优先级 → 必须加括号
-        if (childPriority < parentPriority) {
-            return "(" + child.expression + ")";
-        }
-
-        // 特殊情况：
-        // 右子树如果是 "-" 或 "/"，即使同级也要加括号
-        if (isRightChild && (parentOp.equals("-") || parentOp.equals("/"))) {
-            if (parentPriority == childPriority) {
-                return "(" + child.expression + ")";
-            }
-        }
-
-        return child.expression; // 其他情况不用括号
-    }
-}