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Collection isEmpty()

Java Collection isEmpty() Method

Last Updated : 17 Mar 2025

The isEmpty() method of Java Collection Interface returns the boolean value 'true' if this collection contains no elements.

Syntax

Parameters

NA

Return

The isEmpty () method returns the boolean value 'true' if this collection contains no elements else it returns false.

Example 1

Output:

Example 2

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.util.concurrent.ConcurrentLinkedQueue.checkNotNull(ConcurrentLinkedQueue.java:920)
	at java.util.concurrent.ConcurrentLinkedQueue.offer(ConcurrentLinkedQueue.java:327)
	at java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:297)
	at com.tpointtech.JavaCollectionIsEmptyExample2.main(JavaCollectionIsEmptyExample2.java:9)

Example 3

Output:

isEmpty() method returns false
Elements are : [1, 2, 3, 4, 5]