Intersection of two strings in Java

Question

Need a Java function to find intersection of two strings. i.e. characters common to the strings.

Example:

String s1 = new String(\"Sychelless\");
St         


        

Answer 1

Optimized solution:

public static String twoStrings(String s1, String s2){

    HashSet stringOne =  new HashSet(), stringTwo = new HashSet();  
    int stringOneLength = s1.length();
    int stringTwoLength = s2.length();
    for(int i=0; i