#22 Class and Object Practical in Java

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In this lecture we will learn:
Class in Java
Syntax of class in Java
Creation of objects in Java
Methods in Java
#1
Whatever we do in Java, we do it in a class.
A class is a user-defined blueprint or prototype from which objects are created.
In a class, we have methods and variables.
Class will be created in the same java file.
We can create any number of classes in a program.
Class does not occupy memory.
Syntax of a class:-
class classname
{
methods, variables
}
#2
Every object has two things: properties and methods.
When an object of a class is created, the class is said to be instantiated. All the instances share the attributes and the behavior of the class.
Action will be done with the help of methods.
We need to specify the access to methods. We will specify it as public if we want it to be called from anywhere else.
If we want the method to return any value then we need to specify its return type like int for Integer type values.
As Java is a statically typed language so you have to specify the return type in it.
Syntax of method:-
= access modifier return type method name()
public int add()
{
statement;
}
#3
We need an object to call a method from a different class.
Creating an object:-
classname reference variable= new classname();
reference variable is used to tell that this variable is made to establish a reference between a class.
new keyword is used to tell that we have to utilise the space for an object.
We can call a method by using the reference variable of the object.
We have to pass the values if we want some operations to be on them.
We also have to accept values in a method as well if we pass some values. For this, we have to specify parameters in a method based on the type of passed values.
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