cc150：1.8

package isRotation;
import java.util.Arrays;
public class isRotation{

public static boolean isRotation(String s1, String s2) {
	int len=s1.length();{
	if(len==s2.length()&&len>0)
	{
		String s1s1=s1+s1;
		return isSubstring(s1s1,s2);
	}
return false;
}


}
private static boolean isSubstring(String s1s1, String s2) {
	// TODO Auto-generated method stub
	return false;
}
public static void main(String args[]) {
	String s1 = "erbottlewat";
	String s2 = "water";
	System.out.println(isRotation(s2, s1));
	
}
}