IT Knowledge Sharing | Interview questions

Solution: retainAll method do this.   public boolean retainAll (Collection<?> c) Example: public class Test {        public static void main(String [] args){          LinkedHashSet hs = new LinkedHashSet();           // add elements to the hash set           hs.add("B");           hs.add("A");           hs.add("D");           hs.add("E");           hs.add("C");           hs.add("F");           System.out.println(hs);                     LinkedHashSet hs2 = new LinkedHashSet();       ...