Safest option to replace hashtable?

Question

I have some old 3rd party Java code I am converting to Java 6. It contains HashTable instances, which are flagged as obsolete collections. What should I replace them with? What is the safest option?

Just leave them. Obsolete doesn't mean the same as not supported. — President James K. Polk, Aug 14 '11 at 00:21

score 6 · Accepted Answer · edited May 23 '17 at 12:01

6

Although not marked as deprecated in the API doc, HashTable is obsolete, you could consider use HashMap.

For the differences, you could check this post.

The main differences (the two that the doc said) are:

HashMap is unsynchronized;
HashMap can contain nulls.

So beware of these two when you swap in HashMap for HashTable.

edited May 23 '17 at 12:01

Community

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answered Aug 14 '11 at 00:21

zw324

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score 4 · Answer 2 · answered Aug 14 '11 at 00:19

4

java.util.HashMap has very similar semantics, however it is not synchronized. If you depend on the synchronized behavior, you can use java.util.concurrent.ConcurrentHashMap

answered Aug 14 '11 at 00:19

Yann Ramin

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Safest option to replace hashtable?

2 Answers2