Java怎么生成括号

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Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:[  "((()))",  "(()())",  "(())()",  "()(())",  "()()()"]

public class Solution {    public List generateParenthesis(int n) {        ArrayList result = new ArrayList();        dfs(result, "", n, n);        return result;    }    /*    left and right represents the remaining number of ( and ) that need to be added.    When left > right, there are more ")" placed than "(". Such cases are wrong and the method stops.    */    public void dfs(ArrayList result, String s, int left, int right){        if(left > right)    //因为从left开始减一，所以left不可能小于right            return;        if(left==0&&right==0){            result.add(s);            return;        }        if(left>0){            dfs(result, s+"(", left-1, right);          //        }        if(right>0){            dfs(result, s+")", left, right-1);        }    }}

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