import java.util.*; public class Solution { public String LeftRotateString(String str,int n) { if(str.length() < n || str.length()==0){ return ""; } char[] arr = str.toCharArray(); List<Character> list = new ArrayList<>(); for(int i=0; i< str.length(); i++){ list.add(arr[i]); } while(n > 0){ char ch = list.remove(0); n--; list.add(ch); } StringBuffer stringBuffer = new StringBuffer(); for(int i =0;i<list.size();i++){ stringBuffer.append(list.get(i)); } return stringBuffer.toString(); } }