package com.example.yin_zeping.myapplication;

/**
 * Created by yin_zeping on 2016/3/1.
 */
public class StringUtils {

    /**
	* modified
	*/
    public static String subString(String s) {
        return s.substring(0, 2);
    }
}

package com.example.yin_zeping.myapplication;

/**
 * Created by yin_zeping on 2016/3/1.
 */
public class StringUtils {

    /**
	*@auther Zeping.Yin
	* modified
	*/
    public static String subString(String s) {
        return s.substring(0, 2);
    }
}

modify code