判断两个字符串是否是回环变位

Test.java

/**
 * Created by a598799539 on 15-7-2.
 * github: https://github.com/a598799539
 */
public class Test {
    public static void main(String[] args){
        String string1 = "ACAT";
        String string2 = "TACA";
        isCircleRotation(string1,string2);
    }
    
    //判断两个字符串是否是回环变位
    public static boolean isCircleRotation(String string1, String string2){
        int index = string1.indexOf(string2.substring(0,2));
        String rot;
        if(index == -1){
            rot = string1.substring(string1.length()-1) + string1.substring(0,string1.length()-1);
        }else{
            rot = string1.substring(index) + string1.substring(0,index);
        }
        if(rot.equals(string2)){
            return true;
        }else{
            return false;
        }
    }
}