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Java Collections addAll() Method

The addAll() is a method of Java Collections class which adds all of the specified elements to the specified collection. The elements to be added may be specified individually or as an array.


Following is the declaration of addAll() method:


Parameter Description Required/Optional
c It is a collections into which elements are to be inserted. Required
elements Elements are the elements to be inserted into c. Required


The addAll() method returns true if the collection changed as a result of the method call.


UnsupportedOperationException- If collection c does not support the add operation.

NullPointerException- If elements contain null values and c does not permit null elements, or if c or elements are null.

IllegalArgumentException- If some properties of a value in elements prevent it from being added to c.

Compatibility Version

Java 1.5 and above

Example 1

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Boolean Result: true
Collection Value: [1, 2, 3, 4, 5]

Example 2

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The List are: [Rahul, Karthik, OM, Shiva, Anand, Prem]
Boolean Result: true
Collection Value: [Rahul, Karthik, OM, Shiva, Anand, Prem, Rahul, OM, Prem]

Example 3

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Initial collection value: [JavaTpoint, SSSIT.COM, Hindi100.COM]
Boolean Result: true
Final collection value: [JavaTpoint, SSSIT.COM, Hindi100.COM, Rank1, Rank2, Rank3]

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