在哪里可以找到java5和java6之间的API区别

Question

I'm working on an Android project and support minSdkVersion=7 . When sdk version below 8, it will use java5. And I found String.isEmpty() doesn't exit in java5. So it caused many crashes.

To fix crashes , I have changed String.isEmpty() to String.length() == 0 . After that I searched google and didn't find a convenient document figured out the API difference between java5 and java6.

So my question is where can I find such document?

Answer 1

AFAIK, there is no document that exhaustively lists all of the differences between different Java versions at the API level. However, in the (Oracle Java) javadocs, new classes and classes typically have a "Since" tag that says when they were added.

For example, the javadocs for String.isEmpty() say:

public boolean isEmpty()

Returns true if, and only if, length() is 0.

Returns:
    true if length() is 0, otherwise false
Since:
    1.6