CODEWITHSUNDEEP
javacollections
John
John

Reputation: 181

Adding collections to one another

I'm reviewing for a class, and this is an old question:

I need to write a method

void addAll(Collection c1, Collection c2);

that adds all the elements in c2 to c1.

Could I just do something with addAll? I'm not familiar with it, but it seems like I could write:

c1.addAll(c2);

Upvotes: 1

Views: 7906

Answers (2)

Paŭlo Ebermann
Paŭlo Ebermann

Reputation: 74800

If your task is to write such a method, it may be the case that you are not allowed to use the addAll method (since it would be too easy, and you learn not so much). If so, think about how to write it again (read the documentation linked by kubi for inspirations).

Upvotes: 0

kubi
kubi

Reputation: 313

Yes, that'll work. The boolean returned determines whether the collection has been modified by the call.

http://download.oracle.com/javase/6/docs/api/java/util/Collection.html#addAll(java.util.Collection)

Upvotes: 3

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