How to decide usage of Java Collections ???


ArrayList – orderd, fast iteration and fast random access.
LinkedList – orderd,fast insertion and deletion
HashSet – unsorted, unordered Set. no duplicates and you don’t care about order.
LinkedHashSet– orderd, Use this class instead of HashSet when you care about the iteration order.
TreeSet– Sorted.
HashMap– unsorted, unordered. don’t care about the order.
LinkedHashMap– maintains insertion order (or, optionally, access order). slower than HashMap for adding and removing elements, you can expect faster iteration with a LinkedHashMap.
TreeMap – Sorted. TreeMap lets you pass your own comparison rules in when you construct

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s