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.

The Java Tutorials ‘ Deployment Trail features the Packaging Programs in JAR Files lesson that includes the relevant section Setting Package Version Information.

Since the Scanner class is found outside of java.lang, you must either directly reference the java.util package every time you use the Scanner, or just add a single Scanner import statement to your ...

That three percent included packages, methods, and class names. But those declarations—like starting a function with package java.lang —can only be used in certain ways.