堆栈匹配输出错误

Question

我想知道我是否能得到一些帮助，我对这个创建的类有问题，输出不正确。任何帮助将不胜感激：

import java.util.*;

public class Comparison {

    public static void main(String[] args) {
        Stack<Character> stack = new Stack<>();

        System.out.print("Please enter arithmetic expression: For example, the expression {25 + (3 – 6) * 8}");
        Scanner input = new Scanner(System.in);
        {
            String capture = input.next();
            for (int i = 0; i < capture.length(); i++) {
                char p = capture.charAt(i);
                if (p == '(' || p == '{' || p == '[' || p == ')' || p == '}' || p == ']') {
                    stack.push(p);
                }

                char r = stack.peek();
                if (p == '{' && r == '}' || p == '(' && r == ')' || p == '[' && r == ']') {
                    stack.pop();
                    System.out.print("Arithmetic Expression: has matched symbols. ");
                } else {
                    System.out.print("Arithmetic Expression: has mismatched symbols. ");
                }
            }
        }
    }
}

输出：

Please enter arithmetic expression: For example, the expression {25 + (3 – 6) * 8} 
{25 + (3 – 6) * 8} 
Arithmetic Expression: has mismatched symbols. Arithmetic Expression: has mismatched symbols. Arithmetic Expression: has mismatched symbols. BUILD SUCCESSFUL (total time: 6 seconds)

预期产出：

预期输出应该只是符号，在这种情况下输出应该读取算术表达式：具有匹配的符号:(），{}，因为一旦找到匹配代码就会弹出。数值无关紧要。但是如果没有匹配 - 算术表达式：符号不匹配。 （然后是符号）。