CreateHashSetFromCollectionExample.java

importjava.util.ArrayList;
importjava.util.HashSet;
importjava.util.List;
importjava.util.Set;

publicclassCreateHashSetFromCollectionExample {
publicstaticvoidmain(String[] args) {
List<Integer> numbersDivisibleBy5 = newArrayList<>();
numbersDivisibleBy5.add(5);
numbersDivisibleBy5.add(10);
numbersDivisibleBy5.add(15);
numbersDivisibleBy5.add(20);
numbersDivisibleBy5.add(25);

List<Integer> numbersDivisibleBy3 = newArrayList<>();
numbersDivisibleBy3.add(3);
numbersDivisibleBy3.add(6);
numbersDivisibleBy3.add(9);
numbersDivisibleBy3.add(12);
numbersDivisibleBy3.add(15);

// Creating a HashSet from another collection (ArrayList)
Set<Integer> numbersDivisibleBy5Or3 = newHashSet<>(numbersDivisibleBy5);

// Adding all the elements from an existing collection to a HashSet
numbersDivisibleBy5Or3.addAll(numbersDivisibleBy3);

System.out.println(numbersDivisibleBy5Or3);
 }
}