public static void main(String[] args) {

// Write a Java program to append the specified element to the end of a hash

// set.

HashSet<Integer> s = new HashSet<>();

s.add(10);

s.add(20);

s.add(120);

s.add(200);

s.add(150);

s.add(230);

// System.out.println(s);

// Write a Java program to iterate through all elements in a hash list

// Iterator itr = s.iterator();

// while (itr.hasNext()) {

// // System.out.println(itr.next());

// }

// Write a Java program to get the number of elements in a hash set and empty it

// System.out.println(s.size());

// s.clear();

// System.out.println(s);

// Write a Java program to clone a hash set to another hash set

HashSet<String> str = new HashSet<>();

str.add("atb");

str.add("atb2");

str.add("atb4");

str.add("atnuooo");

// System.out.println(str);

// for (String i : str) {

// System.out.println(i);

// }

Set<String> st = new HashSet<>();

st = (Set) str.clone();

st.add("atb4");

st.add("atnu");

st.add("atnub");

// System.out.println(st);

// Write a Java program to convert a hash set to an array

// String ab[] = str.toArray(new String[str.size()]);

// for (String i : ab) {

// System.out.println(i);

// }

// Write a Java program to convert a hash set to a List/ArrayList

// List<String> l = new ArrayList<>(str);

// System.out.println(l);

// Write a Java program to compare two hash set

// System.out.println(str.equals(st));

// Compare two sets and retain elements which are same on both sets

// str.retainAll(st);

// System.out.println(str);

}