SFR | e-Content Development Program

Glossary

Packages - Packagesare containers for classes

Class - A class is the blueprint from which individual objects are created

Subclass - Classes can be derived from other classes. The derived class (the class that is derived from another class) is called a subclass

Classpath - Classpath is a parameter set either on the command-line, or through an environment variable—that tells the Java Virtual Machine or the Java compiler where to look for user-defined classes and packages

Access control modifiers - Access modifiers to set access levels for classes, variables, methods and constructors

Interfaces - An interface is an abstract type that is used to specify an interface

Java Packages and Interfaces

Defining Package

Java provides a mechanism for partitioning the class name space into more manageable chunks. To create a package, include a package command as the first statement in a Java source file. … Read more »
Importing Package

Java includes the import statement to bring certain classes, or entire packages, into visibility. Once imported, a class can be referred to directly, using only its name… Read more »
Package example

Example program to define and import a package. … Read more »
Defining Interfaces

Interface can be used to specify what a class must do, but not how it does it. Interfaces are similar to classes, but they lack instance variables, and their methods are declared without any body. … Read more »
Implementing Interface

Once an interface has been defined, one or more classes can implement that interface. To implement an interface, include the implements clause in a class definition, and then create the methods defined by the interface … Read more »
Extending Interfaces

One interface can inherit another by use of the keyword extends. The syntax is the same as for inheriting classes. … Read more »