Java Tutorial: This Keyword in Java | Java Constructor Keyword | Java Tutorial For Beginners 2023

"Java Tutorial : This Keyword in Java | Java Constructor Keyword | Java Tutorial For Beginners 2023 |Parnika Tutorials

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00:00 - Introduction
00:42 - What is a constructor
03:40 - Rules for a constructor
05:27- Java program on constructor
12:41 - This keyword
17:13 - Implementation of programs in Notepad++

previous video - STATIC VARIABLE, STATIC METHOD, AND STATIC BLOCK IN JAVA | JAVA COURSE FOR BEGINNERS
https://youtu.be/zHosg60wSaM

1. Constructor in java
2. Difference between method and constructor in java
3. This keyword in java
In this video, I have discussed about constructor and this keyword in java
#constructor #thiskeyword #parnikatutorials
00:00 - Introduction
00:42 - What is a constructor
03:40 - Rules for a constructor
05:27- Java program on constructor
12:41 - This keyword
17:13 - Implementation of programs in Notepad++

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A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created. It can be used to set initial values for object attributes.
It is a special type of method which is used to initialize the object. Every time an object is created using the new() keyword, at least one constructor is called.

How Constructors are Different From Methods in Java?

Constructors must have the same name as the class within which it is defined while it is not necessary for the method in Java.
Constructors do not return any type while method(s) have the return type or void if does not return any value.
Constructors are called only once at the time of Object creation while method(s) can be called any number of times.

When is a Constructor called?

Each time an object is created using a new() keyword, at least one constructor (it could be the default constructor) is invoked to assign initial values to the data members of the same class.

The rules for writing constructors are as follows:

Constructor(s) of a class must have the same name as the class name in which it resides.
A constructor in Java can not be abstract, final, static, or Synchronized.
Access modifiers can be used in constructor declaration to control its access i.e which other class can call the constructor.

primarily there are two types of constructors in java:

No-argument constructor
Parameterized Constructor

1. No-argument constructor

A constructor that has no parameter is known as the default constructor. If we don’t define a constructor in a class, then the compiler creates a default constructor(with no arguments) for the class. And if we write a constructor with arguments or no-arguments then the compiler does not create a default constructor.

Parameterized Constructor

A constructor that has parameters is known as parameterized constructor. If we want to initialize fields of the class with our own values, then use a parameterized constructor.

The this keyword refers to the current object in a method or constructor.

The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter). If you omit the keyword in the example above, the output would be "0" instead of "5".

this can also be used to:

Invoke current class constructor
Invoke current class method
Return the current class object
Pass an argument in the method call
Pass an argument in the constructor call