判断字符串中的括号是否匹配。
[java]
package com.huawei.scp.util;
import java.util.Stack;
public class ParenthesisMatching
{
public boolean check(String str)
{
Stack stack = new Stack();
boolean flag = true;
for (int i = 0; i < str.length() && flag; i++)
{
try
{
switch (str.charAt(i))
{
case '(':
case '[':
case '{':
stack.push(str.charAt(i));
break;
case ')':
if (stack.pop() != '(')
flag = false;
break;
case ']':
if (stack.pop() != '[')
flag = false;
break;
case '}':
if (stack.pop() != '{')
flag = false;
break;
}
}
catch (Exception e)
{
flag = false;
}
}
if (flag && !stack.isEmpty())
flag = false;
return flag;
}
public static void main(String[] args)
{
ParenthesisMatching pm = new ParenthesisMatching();
System.out.println("(: " + pm.check("("));
System.out.println("a(bc[d])e{fd}: " + pm.check("a(bc[d])e{fd}"));
System.out.println("a(bc]d: " + pm.check("a(bc]d"));
System.out.println("a(b(c)d: " + pm.check("a(b(c)d"));
System.out.println("a(b)c)d: " + pm.check("a(b)c)d"));
}
}