Question

This is little different from what already been asked for here

I would like to know what topics/APIs are most important for Java interviews. for example –

• Concurrency,
• Collections
  …..and like that.

The reason is because implementations like ConcurrentHashMap (read here) have so much details in them, that one would like to discuss about them as it covers many important aspects

Answer 1

I’d say there are two things you need for every java interview:

1. For Basic knowledge of the Language, consult your favorite book or the Sun Java Tutorial
2. For Best Practices read Effective Java by Joshua Bloch

Apart from that, read whatever seems appropriate to the job description, but I’d say these two are elementary.

I guess these packages are relevant for every java job:

• java.lang (Core classes)
• java.io (File and Resource I/O)
• java.util (Collections Framework)
• java.text (Text parsing / manipulation)