OnlyRuntimeLibraryPackages

DRAFT

Correction

Here is what's right.

Every developer can place any class in a package. While the Java runtime library that is part of the JDK consists of classes that are placed in packages like java.lang or java.util. However, developers can place their own classes in packages as well.

For example, the following source code, to be stored in a file OnlyRuntimeLibraryPackages.java in a subdirectory org/progmiscon/misconception/java, defines a class with the fully-qualified name org.progmiscon.misconception.OnlyRuntimeLibraryPackages:

package org.progmiscon.misconception;

public class OnlyRuntimeLibraryPackages {
  //...
}

All that is needed to put a class in a package is to put a package declaration at the top of the Java source file (e.g., package org.progmiscon.misconception;) and place the source file in a subdirectory that corresponds to the package’s name (e.g., org/progmiscon/misconception).

Value

How can you build on this misconception?

This misconception provides an opportunity to discuss the ideas of modularity, hierachical name spaces, and separate compilation.