Module 25: This Keyword

🔍 What is the this Keyword?

The this keyword in Java is a reference variable that refers to the current object. It is used to avoid ambiguity between instance variables and parameters with the same name, and for constructor chaining or calling current class methods.

✨ Use Cases of this Keyword

• To refer to the current class instance variable
• To invoke current class method
• To invoke current class constructor
• To pass as an argument in the method or constructor

📘 Example: Using this

                    class Student {
                      int id;
                      String name;
                    
                      Student(int id, String name) {
                        this.id = id;           // refers to instance variable
                        this.name = name;
                      }
                    
                      void display() {
                        System.out.println(id + " " + name);
                      }
                    
                      void show() {
                        this.display();         // calls current class method
                      }
                    }
                    
                    public class Main {
                      public static void main(String[] args) {
                        Student s1 = new Student(101, "John");
                        s1.show();
                      }
                    }