递归打印字符串的所有子串

package com.algorithm.practice.string;

public class GetChildString {
    //打印当前字符串的字串 比如  abc 有字串 "" ,"a","ab","ac","abc","b","bc","abc"
    public static void  pringChildString(char[] chars,int index,String lastR){
            if (index==chars.length){//index代表当前遍历的字符在字符串的位置
                System.out.println(lastR);
                return;
            }
            pringChildString(chars,index+1,lastR+String.valueOf(chars[index]));//传当前元素
            pringChildString(chars,index+1,lastR);//不传当前元素
    }
    public static void main(String[] args){
        String str="abc";
        pringChildString(str.toCharArray(),0,"");
    }

}