notes on core java in java

Bin contains all tools such as javac, appletviewer, awt tool, etc., whereas lib contains API and all packages. What is casting?– Casting is used to convert the value of one type to another. In the context of the Java Development Kit (JDK), the “bin” and “lib” directories serve different purposes: bin (binary): This directory contains … Read more

Methods are functions that operate on instances of classes in which they are defined. Objects can communicate with each other using methods and can call methods in other classes. Method definition has four parts. They are name of the method, type of object or primitive type the method returns, a list of parameters and the … Read more

Encapsulation is the mechanism that binds together code and data it manipulates and keeps both safe from outside interference and misuse. Inheritance is the process by which one object acquires the properties of another object. Polymorphism is the feature that allows one interface to be used for general class actions. In Java, Encapsulation, Inheritance, and … Read more

In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOP program, unit of program is object, which is nothing but combination of data and code. b) In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object … Read more

The marker interface is a design pattern, used with languages that provide run-time type information about objects. It provides a way to associate metadata with a class where the language does not have explicit support for such metadata. To use this pattern, a class implements a marker interface, and code that interact with instances of … Read more