What is the difference between java and core java?

Question

When looking at job openings on-line, I noticed that some openings required knowledge of \"core Java\". What is core java and how is different from java?

Answer 1

A simple step to understand what is java and core java.

• Find a book for Java.

• Find a book for core java.

• Compare the content of both books.

Actual result: both have almost same content.

Result: Java and core java is same.

core java is just slang, to emphasize on deep knowledge of basic java. but if I say I know Java it doesn't mean that I don't have deep knowledge of basic java, or if I know everything in java.