this keyword.txt

This keyword:
If you many constructors you want to call the specific or current constructor then you use the this keyword.
Example:
public class Person {
    private String name;
    private int age;

    // Constructor with parameters
    public Person(String name, int age) {
        this.name = name; // "this.name" refers to the instance variable, "name" refers to the parameter
        this.age = age; // "this.age" refers to the instance variable, "age" refers to the parameter
    }

    // Method to display information about the person
    public void displayInfo() {
        System.out.println("Name: " + this.name); // Using "this.name" to refer to the instance variable
        System.out.println("Age: " + this.age); // Using "this.age" to refer to the instance variable
    }

    // Getter and setter methods
    public String getName() {
        return this.name; // Using "this.name" to refer to the instance variable
    }

    public void setName(String name) {
        this.name = name; // Using "this.name" to refer to the instance variable
    }

    public int getAge() {
        return this.age; // Using "this.age" to refer to the instance variable
    }

    public void setAge(int age) {
        this.age = age; // Using "this.age" to refer to the instance variable
    }
}

public class Main {
    public static void main(String[] args) {
        // Creating an instance of Person class
        Person person1 = new Person("John", 30);

        // Displaying information about the person
        person1.displayInfo();

        // Changing the person's name using setter method
        person1.setName("Alice");

        // Changing the person's age using setter method
        person1.setAge(25);

        // Displaying updated information about the person
        person1.displayInfo();
    }
}