The Setting Package Version Information page indicates that seven pieces of information (seven lines in the manifest file) can be specified for package version information. The first line of the ...

In the package directive’s absence, those classes and interfaces belong to the unnamed package (the directory the JVM regards as the current directory—the directory where a Java program begins ...

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.

2. The Java profiler: javap You can consider the Java command-line tool javap a complement to the javac utility. While javac compiles code, the javap utility reverses that compilation and provides ...