Flow Control

Three types of control flow statements are provided by Java.


Polymorphism is a term whose Greek etymology means, "taking on or possessing several forms".

Singleton Class

The singleton class usually manages only object.

Access Modifier

Access modifiers determine the access levels of classes, variables, but also constructors and methods.

Java Exceptions

Exceptions are errors that occur during the execution of a Java program, and therefore require specific handling.


In the programming fields, inheritance means that a class or an object may inherit the properties of another (parent) class or object.


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