java.lang: A collection of language-related classes, such as Object and String, organized in the java package’s lang subpackage; java.lang.ref: A collection of reference-related language classes ...

For example, suppose package physics contains a Math class that’s identical to java.lang‘s Math class in that it implements the same PI constant and trigonometric methods.

With no added import statements to your code, your Java app has default access to all of the classes in the java.lang package. This includes classes such as: String; System; Integer; Double; Math; ...

Hi! I'm making a game for Android using Java and the Libgdx engine. However, I want the code to be independent of the engine, and so am wrapping any references to Libgdx in its own class. For ...