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Java Vector retainAll() Method

The retainAll() method of Java Vector class is used to retain only that elements in the vector which are contained in the specified collection. In other words, it removes all elements from this vector that are not contained in the specified collection.


Following is the declaration of retainAll() method:


Parameter Description Required/Optional
c It is a collection of elements which will be retained in this vector, and all other elements are removed. Required


The retainAll() method returns true if the vector changed as a result of the call.


NullPointerException- This method has thrown an exception if the vector contains one or more null elements and the specified collection does not support null elements or if the specified collection is null.

Compatibility Version

Java 1.2 and above

Example 1

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Values in vector :[1, 2, 3, 4, 2]
Values in vector :[2, 3, 2]

Example 2

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Vector: [A, B, C, 10, 20]
Collection retained
Final Vector: [A, B, C]

Next TopicJava Vector

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