Java Essentials - This keyword in java

This keyword in Java

This keyword will actually refer the current object defined under the class

And that's why this keyword will be used in our Java code in a very frequent basis

What are the purposes of this keyword? This is a reference variable which refers to the current object defined under the class

This keyword can refer to the members also. The members of the class can also be accessed using this

using this this keyword so these within bracket parameter is referred to the

constructor of the current class so this is very interesting that we'll be

using our this keyword in our Java code so this is a reference variable

which is actually referring which is have actually holding the reference of the

current object and object is having a certain state and the behavior so here it is

containing member variables containing some values and the respective of permitted operations mentioned in the member methods

So let us go for one practical demonstration to understand what is the purpose of this this keyword in our Java code in this program we shall discuss about the keyword this so here we have

defined one class the name of the class is my class having private I NTA

comma B two instance variable so public my class so there is a constructor which

is parameter as constructed having I NTA and B as input parameters now the thing

is that these input parameters A and B and also the the instance variables are a and b so if we want to initialize this a with this input

parameter a then that may produce some ambiguity if you write a is equal to a so that is

ambiguous so that's why it is better to write this dot a is equal to a here this is

actually indicating the object which will be defined under the class my class so that

object named dot a in this way i'm accessing the instance variable a is equal to a and

this is a which is on the right side of this assignment statement is nothing but the input parameter a similarly this dot B is

equal to B here this is my non parameter as constructor the constructor name will be same as that of the class name that is my class Here also it is my class and it is non And here we are calling the these uh

0.0, that means it will call the parameter as constructor with the value

zero and zero as two parameters. So in this way, this here, this is actually referring the constructor

That is the parameter as constructor because we are passing this 0.0 as the parameters

We're having the set data. and it is having this A and B as input parameters and this dot A is equal to A and this dot B is equal to B

That means the object defined under the class My class that object name

A is equal to input parameter A and object name dot B will be equal to input parameter B here

Display is actually displaying the value of A and B respectively. Now here we are having this keyword this the class we are defining containing the main function the my

class is having the object that is the my object is equal to new my class so the new is

the operator and this my class is actually the constructor with the help of which this my object has got defined and now we are going for my object display So display will print this A and B We know that whenever you are calling this constructor this constructed is non parameterized that means this particular constructor has been called

So it will pass this, it will call this parameters constructed with the value 0 and 0

So what will happen this A and B will be initialized with the value 0 and 0

So this my object. Dot display will print the value of A and B as 0 and 0

Next time we are calling this, that is a my object. That set data, set data will initialize this A and B with the respective values

And then my object. Dot display will print this 23 and 46 as the result as outcome

So in this way, we have discussed that how this constructor can be defined and what are the different types of constructors

are there and also we have we have shown you that how to how to use the keyword

this and this is actually referring the object defined under the class so it

can also call it as a dummy object name thanks for watching this video