Initial Checkin

SetTest1.java

@@ -0,0 +1,21 @@
+import java.util.*;
+
+class SetTest1{
+    public static void main(String []args) {
+        String string1= "ABFED";
+        String string2= "AFBHI";
+
+        Set<Character> set1 = string2CharSet(string1);
+        set1.retainAll(string2CharSet(string2));
+ 
+        System.out.println(set1.toString()); 
+    }
+
+    private static Set<Character> string2CharSet(String s1) {
+        Set<Character> set1=new HashSet<Character>();
+        Character[] cha1 = s1.chars().mapToObj(c -> (char) c).toArray(Character[]::new);
+        set1.addAll(Arrays.asList(cha1));
+        return set1;
+    }
+
+}