cc150_1_8.java

/*
 * Created by bitcpf
 */

package cc150_1_8;


public class StringRotation {
	
	public static boolean isSubstring(String s1, String s2){
		String temp = s1+s1;
		char[] temp_char = temp.toCharArray();
		char[] s2_char = s2.toCharArray();
		
		
		int i = 0;
		int j = 0;
		int count = 0;
		while(i < temp_char.length - s2_char.length){
			
			if(temp_char[i] == s2_char[0]){

				j = 0;
				while(j < s2_char.length){
					
					if(s2_char[j] == temp_char[i+j]){
						count ++;
					}
					else{
						break;
					}

					j ++;
				}
			}
			
			i ++;;
			
			
			if(count == s2.length()){
				return true;
			}

		}
		return false;
	}

	
	
	
	public static void main(String[] args){
		String s1 = "waterbottle";
		String s2 = "erbottlewat";
		
		
		System.out.println(s1);
		System.out.println(s2);
		System.out.println(isSubstring(s1,s2));
	}

}