输入一个字符串，打印出该字符串中字符的所有排列

题目：

 输入一个字符串，打印出该字符串中字符的所有排列

解答：

public class Solution {
    public static void main(String[] args) {

        //Scanner sc = new Scanner(System.in);
        //String str = sc.nextLine();

        myPrint("abc");
    }

    private static void myPrint(String str) {
        if(str == null) {
            return;
        }

        char[] chs = str.toCharArray();
        myPrint(chs, 0);
    }

    private static void myPrint(char[] str, int i) {
        if(i >= str.length) {
            return;
        }

        if(i == str.length-1) {
            System.out.println(String.valueOf(str));
        } else {
            for(int j = i; j < str.length; j++) {
                char temp = str[j];
                str[j] = str[i];
                str[i] = temp;

                myPrint(str, i+1);

                temp = str[j];
                str[j] = str[i];
                str[i] = temp;
            }
        }
    }
}