输入一个字符串，打印出该字符串中字符的所有排列

题目：

解答：

 1 public class Solution {
 2     public static void main(String[] args) {
 3 
 4         //Scanner sc = new Scanner(System.in);
 5         //String str = sc.nextLine();
 6 
 7         myPrint("abc");
 8     }
 9 
10     private static void myPrint(String str) {
11         if(str == null) {
12             return;
13         }
14 
15         char[] chs = str.toCharArray();
16         myPrint(chs, 0);
17     }
18 
19     private static void myPrint(char[] str, int i) {
20         if(i >= str.length) {
21             return;
22         }
23 
24         if(i == str.length-1) {
25             System.out.println(String.valueOf(str));
26         } else {
27             for(int j = i; j < str.length; j++) {
28                 char temp = str[j];
29                 str[j] = str[i];
30                 str[i] = temp;
31 
32                 myPrint(str, i+1);
33 
34                 temp = str[j];
35                 str[j] = str[i];
36                 str[i] = temp;
37             }
38         }
39     }
40 }