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If a class have an entity reference, it is known as Aggregation. Aggregation represents HAS-A relationship. Aggregation in Java is a mechanism of using an object of one class as a member variable of another class. It is a way to achieve a "has-a" rel...
An abstract class in Java is a special kind of class that cannot be instantiated on its own. It is used as a base class or blueprint for creating concrete subclasses. Abstract classes are used to provide a common interface and implementation for a se...
Final is a Non-acess modifier.The final keyword in Java can be used for different purposes. Most commonly, it is used to create immutable objects. This means that once an object is created, it cannot be modified. It can also be used to prevent inheri...
If subclass (child class) has the same method as declared in the parent class, it is known as method overriding. Usage of Method Overriding Method overriding is used to provide the specific implementation of a method which is already provided by its ...
This keyword is a reference variable that refer to a current Object. This can be used to refer current class instance variable. If we don't use this keyword. class Staff{ int idno; String name; long salary; Staff(int idno,String name,long salary){ Id...
It is block of code that initializes the newly created Object. It has same name as its Class. Constructor has no return type. The constructor cannot be static, abstract or Final. public class MyClass{ //This is the constructor MyClass(){ } ...
Inheritance is a process in which one object acquires all the properties & behavior of a parent object. When you inherit from an existing class, you can reuse methods & fields of the parent class. Inheritance represent IS-A relationship which is also...
A Java access modifier specifies which classes can access a given class and its fields, constructors and methods. There are four types of access modifiers in Java there are as follows: 1.private 2.default (package) 3.protected 4.public Java Access Mo...
In software programming, we have various types of programming languages. Major languages amongst them are either procedural or object-oriented in nature. In procedural programming languages, bigger problems are broken down into small solvable problem...