HashSet remove() method is used to remove a particular element from a HashSet. Note that it is only after JDK version 1.2 and ahead, and will throw compilation errors before in version JDK 1 and JDK1.1.
Note: This method returns true if the specified element is present in the HashSet otherwise it returns boolean false.
Syntax:
HashSet.remove(Object O)
Parameters: The parameter O is of the type of HashSet and specifies the element to be removed from the HashSet.
Return Value: Boolean true and false
Example 1:
Java
// Java code to illustrate// HashSet.remove() method// over String Elements// Importing required classesimport java.util.*;// Main class// HashSet demopublic class GFG { // Main driver method public static void main(String args[]) { // Creating an empty HashSet // Declaring object of string type HashSet<String> set = new HashSet<String>(); // Adding custom input elements into the Set // using add() method set.add("Welcome"); set.add("To"); set.add("Geeks"); set.add("For"); set.add("Geeks"); // Displaying the HashSet(object elements) System.out.println("HashSet: " + set); // Removing elements // using remove() method set.remove("Geeks"); set.remove("For"); set.remove("Welcome"); // Now displaying the HashSet after removal // of elements from it System.out.println( "HashSet after removing elements: " + set); }} |
Output
HashSet: [Geeks, For, Welcome, To] HashSet after removing elements: [To]
Example 2:
Java
// Java code to illustrate remove()// method of Hashset class// over Integer Elements// Importing required classesimport java.util.*;// Main classpublic class GFG { // Main driver method public static void main(String args[]) { // Creating an empty HashSet // Declaring object of integer type HashSet<Integer> set = new HashSet<Integer>(); // Adding custom input elements into the Set // using add() method set.add(5); set.add(3); set.add(1); set.add(4); set.add(3); // Displaying the HashSet(object elements) System.out.println("HashSet: " + set); // Removing elements // using remove() method set.remove(3); set.remove(1); // Now displaying the HashSet after removal // of elements from it System.out.println( "HashSet after removing elements: " + set); }} |
Output
HashSet: [1, 3, 4, 5] HashSet after removing elements: [4, 5]
