Java API and Class Libraries Quiz

Packages in Java

• The purpose of a package in Java is to organize related classes and interfaces into a single unit, making it easier to locate and use them.

API in Java

• API stands for Application Programming Interface, which is a collection of pre-written classes, methods, and interfaces that provide a way to interact with the Java platform.

Class Library in Java

• A class library in Java is a collection of pre-written classes that provide a wide range of functionalities, which can be used to build applications.

Package Declaration

• If no package is explicitly declared for a Java class, it is placed in the default package.

Java API Documentation

• The purpose of the Java API documentation is to provide detailed information about the classes, methods, and interfaces available in the Java platform.

Java Platform Class Library

• The Java platform provides a large class library that includes a wide range of classes for tasks such as input/output, networking, and graphical user interfaces.

Java Abstract Window Toolkit Event Package

• The Java Abstract Window Toolkit Event Package (java.awt.event) contains classes and interfaces that handle GUI events such as mouse clicks and key presses.

Input/Output Package

• The java.io package contains classes that enable programs to input and output data.

Class Methods

• A Java class has two types of methods: instance methods and static methods.

Creating Objects

• The new keyword is used to create objects from classes in Java.

Accessing Static Members

• Static members of a class can be accessed using the class name.

Import Statements

• Import statements in Java programs specify the packages or classes that can be used in the program.

Java Swing GUI Components Package

• The Java Swing GUI Components Package (javax.swing) provides a wide range of GUI components for building graphical user interfaces.

Accessing Instance Members

• Instance members of a class can be accessed using an object reference.

Accessing Non-Static Members

• Non-static members of a class can be accessed using an object reference.

Importing Classes

• The javax.swing.JApplet class can be used without an import statement by using the fully qualified name, e.g., javax.swing.JApplet x = ……………….;

Test your knowledge on using Java API and class libraries in object-oriented programming. Learn about navigating the Java API documentation and understanding packages in Java.