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/* Remove specified element from Java HashSet example This Java Example shows how to remove a specified object or element contained in Java HashSet object using remove method. */ import java.util.HashSet; public class RemoveSpecifiedElementFromHashSetExample { public static void main(String[] args) { //create object of HashSet HashSet hSet = new HashSet(); //add elements to HashSet object hSet.add(new Integer("1")); hSet.add(new Integer("2")); hSet.add(new Integer("3")); System.out.println("HashSet before removal : " + hSet); /* To remove an element from Java HashSet object use, boolean remove(Object o) method. This method removes an element from HashSet if it is present and returns true. Otherwise remove method returns false. */ boolean blnRemoved = hSet.remove(new Integer("2")); System.out.println("Was 2 removed from HashSet ? " + blnRemoved); System.out.println("HashSet after removal : " + hSet); } } /* Output would be HashSet before removal : [3, 2, 1] Was 2 removed from HashSet ? true HashSet after removal : [3, 1] */ |
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