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Java Collection containsAll() Method with Examples

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Java Collection containsAll() Method

The containsAll() method of Java Collection Interface returns a Boolean value ‘true’, if this collection contains all the elements in the invoked collection.

Syntax

Parameters

The parameter ‘c’ represents the collection to be checked for occurrence in this collection.

Throws

ClassCastException– if the types of the elements in the specified collection are not compatible with this collection.

NullPointerException– if the specified collection is null or it contains one or more null elementsl and this collection does not allow null elements.

Return

The containsAll() method returns Boolean value ‘true’ if this collection contains all of the elements in the invoked collection, else it returns false.

Example 1

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Output:

true  

Example 2

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Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.ArrayDeque.addLast(ArrayDeque.java:249)  at java.util.ArrayDeque.add(ArrayDeque.java:423)  at com.tutorAspire.JavaCollectionContainsAllExample2.main(JavaCollectionContainsAllExample2.java:13)  

Example 3

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Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.AbstractCollection.containsAll(AbstractCollection.java:317)  at com.tutorAspire.JavaCollectionContainsAllExample3.main(JavaCollectionContainsAllExample3.java:14)  
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