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Java Collection isEmpty() Method with Examples

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Java Collection isEmpty() Method

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

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Output:

The queue is empty.  

Example 2

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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.tutorAspire.JavaCollectionIsEmptyExample2.main(JavaCollectionIsEmptyExample2.java:9)  

Example 3

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Output:

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