The contains(E e) method of CopyOnWriteArraySet checks if a given element is present in the Set or not.
Syntax:
public boolean contains(Object o)
Parameters: The function accepts a single mandatory parametero which specifies the element whose appearance is to be checked in the Set.
Return Value: The function returns true if the element is present else it returns false.
Below programs illustrate the above function:
Program 1:
// Java Program to illustrate the CopyOnWriteArraySet// contains() method in Java import java.util.concurrent.CopyOnWriteArraySet;import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArraySet CopyOnWriteArraySet<Integer> ArrSet = new CopyOnWriteArraySet<Integer>(); // Add elements ArrSet.add(32); ArrSet.add(67); ArrSet.add(67); ArrSet.add(100); // print CopyOnWriteArraySet System.out.println("CopyOnWriteArraySet: " + ArrSet); // check if 100 is present // using contains() function if (ArrSet.contains(100)) System.out.println("100 is " + "present in the Set"); else System.out.println("100 is " + "not present in the Set"); // check if 20 is present // using contains() function if (ArrSet.contains(20)) System.out.println("20 is " + "present in the Set"); else System.out.println("20 is " + "not present in the Set"); }} |
Output:
CopyOnWriteArraySet: [32, 67, 100] 100 is present in the Set 20 is not present in the Set
Program 2:
// Java Program to illustrate the CopyOnWriteArraySet// contains() method in Java import java.util.concurrent.CopyOnWriteArraySet;import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArraySet CopyOnWriteArraySet<String> ArrSet = new CopyOnWriteArraySet<String>(); // Add elements ArrSet.add("geeks"); ArrSet.add("gfg"); ArrSet.add("jgec"); ArrSet.add("sudo"); // print CopyOnWriteArraySet System.out.println("CopyOnWriteArraySet: " + ArrSet); // check using contains() function if (ArrSet.contains("gfg")) System.out.println("gfg is " + "present in the Set"); else System.out.println("gfg is " + "not present in the Set"); // check using contains() function if (ArrSet.contains("best")) System.out.println("best is " + "present in the Set"); else System.out.println("best is " + "not present in the Set"); }} |
Output:
CopyOnWriteArraySet: [geeks, gfg, jgec, sudo] gfg is present in the Set best is not present in the Set
