Here's a quick look at the three types of class loaders and everything you need to know to work with them in your Java programs. Java class loaders are a component of the Java virtual machine (JVM ...

class and object models of the underlying host JVM executing JPF Each standard JVM supports a so called Java Native Interface (JNI), that is used to delegate execution from the Java level (i.e. JVM ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

In Java, a package can contain other packages, classes, or both. When modeling, you’ll typically have logical packages that serve primarily to organize your model. You’ll also have physical ...

Library authors would prefer to use interfaces to expose opaque abstractions; abstract classes were meant to be an implementation aid, not a modeling tool. (See Effective Java, "Prefer interfaces ...

You cannot prevent other developers from extending certain classes. A method might accept a specific type and its subclasses, but you want to restrict usage to a select few implementations of your own ...