Here is the solution for XOR Strings 2 in Java7 because for Java 8 they did not give any code to modify but we have to modiy only 3 lines according to question.

import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;

public class Solution {

public static String stringsXOR(String s, String t) {
    String res = new String("");
    for(int i = 0; i < s.length(); i++) {
        if(s.charAt(i) != t.charAt(i))
            res += "1";
        else
            res += "0";
    }

    return res;
}

public static void main(String[] args) {

    String s, t;
    Scanner in = new Scanner(System.in);
    s = in.nextLine();
    t = in.nextLine();
    System.out.println(stringsXOR(s, t));

}

}