CODEWITHSUNDEEP
javaarraylist
pei wang
pei wang

Reputation: 295

remove() in arraylist java

I have a question regarding to remove method in arraylist in java, for example:

 ....
 ArrayList<Array>list=new ArrayList<Array>();



 Array a=new Array (1,2,3);
 Array b=new Array (4,5,6);
 Array c=new Array (7,8,9);

 list.add(a);
 list.add(b);
 list.add(c); 
 ....

My question is, if I want to remove object b from the arraylist, should I use list.remove(1) or list.remove(b)? In another way, should I use object or index for the parameter in the remove method in this case?

Upvotes: 0

Views: 418

Answers (2)

Eel Lee
Eel Lee

Reputation: 3543

You can use both, but obviously better will be deleting object, as the order theoretically might change.

EDIT: As @Luiggi Mendoza mentioned - just remember to override equals() method, if you want to properly use remove(Object o). And if you do, don't forget to also override hashCode().

Upvotes: 3

BilalDja
BilalDja

Reputation: 1092

You can do both, removing with the index or the object him self

Upvotes: 0

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