Java OOP

17 articles

Java OOP – Garbage Collection

The process by which the programs perform memory management automatically is called Garbage Collection in Java. The Garbage Collector(GC) reclaim the memory by finding the unused objects and deleting them. Dynamic memory allocation of objects is achieved using the new operator that uses some memory and the memory remains allocated until there are references for […]

September 1, 2020

JAVA OOP

Java OOP – Java Swing Applications (Layout Manager)

The mechanism of arranging swing controls by adding controls to a container is called layout manager. There are following classes that represents the layout managers: java.awt.BorderLayout java.awt.FlowLayout java.awt.GridLayout java.awt.CardLayout java.awt.GridBagLayout javax.swing.BoxLayout javax.swing.GroupLayout javax.swing.ScrollPaneLayout javax.swing.SpringLayout etc. Visit our previous articles Introduction of Swing applications and Java Containers and Event handling for further more details. BorderLayout The […]

September 1, 2020

JAVA OOP

Java OOP – Java Swing Applications (Containers and Event Handling)

The window that user interacts in any GUI software is called a container. For building GUI applications at least one container class is necessary. A default layout is present in each container which can be overridden using setLayout method. The codes we give to run the container after we adding the controls to the containers […]

August 29, 2020

JAVA OOP

Java OOP – Java Swing Applications(Introduction)

Swing in java used for creating window based applications. It includes components like button, scroll bar, text field etc. Putting together all these components makes a graphical user interface. Java Swing Applications can be divided into four major parts. Containers Controls Layout Manager Event Handling Containers The window that user interacts in any GUI software […]

August 27, 2020

JAVA OOP

Java OOP – Java Inner Classes

Java inner class is a class which is declared inside the class or interface. It can be declared private, public, protected, or with default access whereas an outer class can have only public or default access. We use inner classes to logically group classes and interfaces in one place so that it can be more […]

August 25, 2020

JAVA OOP

Java OOP – Java Interfaces

An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. Sub class of an interface cannot be extended. It should be implemented. You can visit the article Abstraction to get knowledge about abstract classes and methods. To access the method inside the sub class, we […]

August 22, 2020

JAVA OOP

Java OOP – Abstraction

Abstraction is a basic concept of OOP which is displaying the essential details to the user by handling the complexity. It is the process of identifying the required characteristics of an object ignoring the irrelevant details. You can visit the other concepts Inheritance, Polymorphism and Encapsulation if you guys need to know about them. Abstraction […]

August 19, 2020

JAVA OOP

Java OOP – Encapsulation

Encapsulation is binding of object state(fields) and behavior(methods) together. The idea behind the encapsulation is to hide the implementation details from the user. In previous articles we discussed about Inheritance and Polymorphism. You can refer those concepts before going to the encapsulation. Let’s go back to the topic Encapsulation. Real world Example for encapsulation is: […]

August 16, 2020

JAVA OOP

Java OOP – Java Access Modifiers

An access modifier restricts access of a class, constructor, data member, and method in another class. In java, we have four access modifiers that specify which classes can access a given class and its fields, constructors and methods. Default Private Protected Public If you want you can refer previous concepts Inheritance and Polymorphism. Let’s go […]

August 15, 2020

JAVA OOP

Java OOP – Java Packages

A package is a group of classes, interfaces and other packages. We can organize our classes and interfaces using packages. In java there are two types of packages. Built-in packages User defined packages Built – In Packages In java we can see packages that defined already. They are known as Built-in packages. Let’s see an […]

August 15, 2020

JAVA OOP

Java OOP – Polymorphism

Polymorphism is ability of a message to be displayed in more than one form. Simply, this allows us to perform single action in different ways. We can perform polymorphism in java by method overriding and method overloading. In last two articles we discussed about Inheritance (Part I and Part II). You can visit the article […]

August 10, 2020

JAVA OOP

Java OOP – Inheritance (Part II)

In the last article we discussed about 6 cases from Inheritance (Part I), one of the main concepts in OOP. Make sure that you have knowledge on those cases before reading of the today article. Let’s go to the rest of the Interface lesson. Case VII When a sub class object is initiated in the […]

August 10, 2020

JAVA OOP

Java OOP -Inheritance (Part I)

According to the Oracle, In the Java language, classes can be derived from other classes, thereby inheriting fields and methods from those classes is called Inheritance. A class that is derived from another class is called a sub class (also a derived class, extended class, or child class). The class from which the subclass is derived is called a super class (also a base class or a parent class). […]

August 9, 2020

JAVA OOP

Java OOP – Static variables and methods

All the static members are created in the template and we can access them without an object. Non-static variables and methods cannot access without an object. Static members are common for all the instances(objects) of the class but non-static members are separate for each instance of class. Today we are going to talk about static […]

August 8, 2020

JAVA OOP

Java OOP – Constructor

A constructor is a block of code that initializes newly created object. This is not a method because this doesn’t have a return type. But before you learn about constructors, make sure that you know about the methods. You can visit the articles of the Java Basics (Java Methods) tutorial. When we create a constructor, […]

August 7, 2020

JAVA OOP

Java OOP – Objects/Classes/Attributes

In the last article we discussed about an Introduction on Java OOP. Today’s article is on the topics Objects, Classes and Attributes. Objects In the real world you can see many objects such as animals, humans, and vehicles etc. All these have a state and a behavior. Software Objects also have a state and a […]

August 6, 2020

JAVA OOP

Java OOP – Introduction

Before the using of concept Object Oriented Programming (OOP), people used the structural programming methodology. In structural programming, coding effort is very high and also complex. So to reduce the coding effort and complexity, James Gosling created the concept of Object Oriented Programming. Object oriented system design is another aspect to come up with the […]

August 4, 2020