Object in JAVA
Java object
A house, motorcycle, truck, notebook, sofa, or computer are examples of objects. An object is any item with state and activity. It could be mental or physical (tangible and intangible). An example of an intangible entity is the financial system.
More on Java Objects :
Everything in Java is built upon the objects and classes, as well as their traits and methods. A truck, for example, is an entity in the actual world. Along with features like accelerate and break, the truck also has qualities like mass and colors.
Any kind of class can have an object as an instance.
Classes are logical constructs, whereas objects are the physical manifestations of a class, and these are the things that are actually taking up memory space.
Objects are categorized into three types:
How to create a class :
To create a object of any class , we use the new keyword . This new keyword create the object at runtime.
Example :
Classname objectName = newKeyword classname();
class Boxers {
//.....variables...
//.....methods.....
}
public class Main
public static void main(String [] args){
//creating new object of class type Boxers
Boxers var = new Boxers();
}
}Ways to Initialize an Object
- Parent to parent reference.
- Parent to child reference.
- Child to child reference.
Code Example :
class Boxers {
//.....variables...
//.....methods.....
}
class RedBoxer extends Boxers{
//This class contains all the features of class Boxers.
}
public class Main{
public static void main(String [] args){
//parent to parent
Boxers var = new Boxers();
//parent to child
Boxers var1 = new RedBoxer();
//child to child
RedBoxer var2 = new RedBoxer();
}
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