The isEmpty(E e) method of CopyOnWriteArraySet checks if the Set is empty or not. It returns true if the Set is empty, else it returns false.
Syntax:
public boolean isEmpty()
Return Value: The function returns true if the Set is empty, otherwise it returns false.
Below programs illustrate the above function:
Program 1:
Java
// Java Program to illustrate the // isEmpty() method in CopyOnWriteArraySet 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( 98 ); ArrSet.add( 100 ); // print CopyOnWriteArraySet System.out.println( "CopyOnWriteArraySet: " + ArrSet); // check using function if (ArrSet.isEmpty()) System.out.println( "\nSet is empty" ); else System.out.println( "\nSet is not empty" ); } } |
CopyOnWriteArraySet: [32, 67, 98, 100] Set is not empty
Program 2:
Java
// Java Program to illustrate the // isEmpty() method in CopyOnWriteArraySet 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>(); // print CopyOnWriteArraySet System.out.println( "CopyOnWriteArraySet: " + ArrSet); // check using function if (ArrSet.isEmpty()) System.out.println( "\nSet is empty" ); else System.out.println( "\nSet is not empty" ); } } |
CopyOnWriteArraySet: [] Set is empty
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#isEmpty–
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.