What is THIS Keyword In java With Examples? || (this) Keyword In java With explanation

THIS Keyword in Java:-

this is a Keyword which refers to current invoking Object. this keyword is used to access the instance variable and instance methods. a keyword cannot be used within the static context.

• I.e.., this keyword cannot be written within a static method or static block.

There are some various usages of 'THIS' keyword in Java are as follows:-

• It can be used to invoke or initiate a current class constructor.
• It can be passed as an argument in the method calling.
• It can be passed as an argument in the constructor call.
• It can be used to return the current class instance.

◾Examples (1) : 

1:  public class Animal {   
2:     void makeNoise() {   
3:        System.out.println(this);   
4:     }   
5:     public static void main(String[] args) {   
6:        Animal an=new Animal();   
7:        System.out.println(an);   
8:        an.makeNoise();   
9:     }   
10:   }   

Before Compilation of program lets's understand the Structure of Our Program Line by Line:-

1. Class: class Animal.
2. Creating Method: make noise.
3. Creating the Main Method.
4. Creating an Object Of Animal.
5. Calling or invoking make noise method with the help of object reference (an).

Let's compile and run the code

◾Examples (2): 

 public class Person {  
      String name="Tom";  
      void eat() {  
           this.washHands();//(washHands) Method Calling  
           this.serveFood();//(serveFood) Method Calling  
           System.out.println("Tom eat food");  
           this.washHands();//again (washHands) Method Calling  
      }  
      void washHands() {  
           System.out.println("Tom Wash your hands");  
      }  
      void serveFood() {  
           System.out.println("Tom Serve food");  
      }  
      public static void main(String[] args) {  
           Person pe=new Person();  
           pe.eat(); // Method Calling or invoking  
      }  
 }  

Let's compile and run the code

◾Examples (3): 

 public class Product {  
      int price=20;  
      void printProductDetails() {  
           System.out.println("Product price ="+this.price+" "+"bucks");  
      }  
      public static void main(String[] args) {  
           Product pro=new Product();  
           pro.printProductDetails();  
      }  
 }  

Let's compile and run the code