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Solution.java
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Solution.java
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package com.doslin.leetcode.stack._20;
import java.util.Stack;
/**
* Valid Parentheses
* Created by doslin on 2017/12/14.
*/
public class Solution {
public boolean isValid(String s) {
Stack<Character> stack = new Stack<>();
for (Character c : s.toCharArray()) {
if ("({[".contains(String.valueOf(c))) {
stack.push(c);
} else {
if (!stack.isEmpty()) {
String m = String.valueOf(stack.peek());
switch (c) {
case ')':
if ("(".equals(m)) {
stack.pop();
} else {
stack.push(c);
}
break;
case '}':
if ("{".equals(m)) {
stack.pop();
} else {
stack.push(c);
}
break;
case ']':
if ("[".equals(m)) {
stack.pop();
} else {
stack.push(c);
}
break;
}
} else {
return false;
}
}
}
return stack.isEmpty();
}
}