Question

(JAVA question)

Write a method named intersection that accepts two strings as the arguments, returns the characters that occur in both strings. For example, if the arguments are “apple#123” and “banana$#345”, your program should return “a#3”.

Answer 1

public class StringsIntersection {

    public static String intersection(String s1, String s2) {
        String common = "";
        for (int i = 0; i < s1.length(); i++) {
            if (s2.indexOf(s1.charAt(i)) >= 0) {
                common += s1.charAt(i);
            }
        }
        return common;
    }

    public static void main(String[] args) {
        System.out.println(intersection("apple#123", "banana$#345"));
    }
}