使用堆栈检查 .txt 文件中的 ('s、{'s、['s 等 - Java

Question

我正在尝试在 java 中编写一个方法来搜索我为特定字符导入的文本文件。该文件实际上是我设计并转换为.txt文件的java程序。

当找到一个左大括号/方括号时，我应该将它添加（推送）到堆栈中，然后当找到相应的右大括号/方括号时，我应该从堆栈中删除（弹出）它。

目的是看我的)、}、]和>的数量是否与(、{、[和>相对应。如果它们都匹配，则该方法应返回 true，否则应返回 false。

有人知道我怎么写吗？

Answer 1

这是平衡输入文本文件中括号的示例实现

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Stack;

public class BalanceBrackets {
    private Stack<Character> symbolStack;

    public void balance(String inputText) {
        symbolStack = new Stack<Character>();
        for (int index = 0; index < inputText.length(); index++) {
            char currentSymbol = inputText.charAt(index);
            switch (currentSymbol) {
            case '(':
            case '[':
            case '{': 
                symbolStack.push(currentSymbol);
                break;

            case ')':
            case ']':
            case '}':
                if (!symbolStack.isEmpty()) {
                    char symbolStackTop = symbolStack.pop();
                    if ((currentSymbol == '}' && symbolStackTop != '{')
                            || (currentSymbol == ')' && symbolStackTop != '(')
                            || (currentSymbol == ']' && symbolStackTop != '[')) {
                        System.out.println("Unmatched closing bracket while parsing " + currentSymbol + " at " + index+1);
                        return;
                    }
                } else {
                    System.out.println("Extra closing bracket while parsing " + currentSymbol + " at character " + index+1);
                    return;
                }
                break;
            default:
                break;
            }
        }
        if (!symbolStack.isEmpty())
            System.out.println("Insufficient closing brackets after parsing the entire input text");
        else 
            System.out.println("Brackets are balanced");
    }

    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new FileReader("D://input.txt"));
        String input = null;
        StringBuilder sb = new StringBuilder();
        while ((input = in.readLine()) != null) {
            sb.append(input);
        }
        new BalanceBrackets().balance(sb.toString());
    }
}