我想测试输入String是否平衡.如果有匹配的左,右括号,括号或花括号,则会保持平衡.
I want to test if an input String is balanced. It would be balanced if there is a matching opening and closing parenthesis, bracket or brace.
example: {} balanced () balanced [] balanced If S is balanced so is (S) If S and T are balanced so is ST public static boolean isBalanced(String in) { Stack st = new Stack(); for(char chr : in.toCharArray()) { if(chr == '{') st.push(chr); } return false; }我在选择做什么时遇到了问题.我是否应该将每个左括号或右括号,方括号或大括号放在堆栈中,然后弹出它们?如果我将它们弹出,那对我有什么帮助?
I'm having problems choosing what to do. Should I put every opening or closing parenthesis, bracket, or brace in a stack then pop them out? If I pop them out, how does that really help me?
推荐答案1)对于每个左括号:{ [ (将其推入堆栈.
1) For every opening bracket: { [ ( push it to the stack.
2)对于每个右括号:} ] )从堆栈中弹出,并检查括号的类型是否匹配.如果没有返回false;
2) For every closing bracket: } ] ) pop from the stack and check whether the type of bracket matches. If not return false;
即,字符串中的当前符号为},如果从堆栈中弹出的是{中的其他符号,则立即返回false.
i.e. current symbol in String is } and if poped from stack is anything else from { then return false immediately.
3)如果行和堆栈的末尾不为空,则返回false,否则返回true.
3) If end of line and stack is not empty, return false, otherwise true.
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如何检查字符串是否平衡?
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