In Java, LinkedHashSet class contains methods known as contains() which is used to return true if this set contains the specified element otherwise false.
Syntax:
public boolean contains(Object o)
Parameters: Element o as a parameter whose presence in this set is to be tested.
Return Type: A boolean value, true if this set contains the specified element.
Example 1:
Java
// Java program to Illustrate contains() Method// of LinkedHashSet class// For String value// Importing required classesimport java.util.*;// Main classpublic class GFG { // Main driver method public static void main(String[] argv) throws Exception { // Try block to check for exceptions try { // Creating an empty LinkedHashSet // Declaring object of string type LinkedHashSet<String> linkset = new LinkedHashSet<String>(); // Populating above HashSet linkset.add("A"); linkset.add("B"); linkset.add("C"); // Printing all elements of above LinkedHashSet System.out.println("LinkedHashSet: " + linkset); // Checking the existence of element // using contains() method boolean exist = linkset.contains("C"); // Printing boolean value if present or not System.out.println("Is the element" + " 'C' present: " + exist); } // Catch block to check for exceptions catch (NullPointerException e) { // Display message if exception occurs System.out.println("Exception thrown : " + e); } }} |
Output:
LinkedHashSet: [A, B, C] Is the element 'C' present: true
Example 2:
Java
// Java program to Illustrate contains() Method// of LinkedHashSet class// For Integer value// Importing required classesimport java.util.*;// Main classpublic class GFG { // Main driver method public static void main(String[] argv) throws Exception { // Try block to check for exceptions try { // Creating an empty LinkedHashSet // Declaring object of integer type LinkedHashSet<Integer> linkset = new LinkedHashSet<Integer>(); // Populating above HashSet linkset.add(10); linkset.add(20); linkset.add(30); // Printing all elements of above LinkedHashSet System.out.println("LinkedHashSet: " + linkset); // Checking the existence of element // using contains() method boolean exist = linkset.contains(25); // Printing boolean value if present or not System.out.println("Is the element" + " '25' present: " + exist); } // Catch block to check for exceptions catch (NullPointerException e) { // Display message if exception occurs System.out.println("Exception thrown : " + e); } }} |
Output:
LinkedHashSet: [10, 20, 30] Is the element '25' present: false
