What is the purpose of using the keyword 'this' in programming code?

The this keyword in Java is used to refer to the current object, within which a method or constructor is being executed. It helps to:

• Distinguish between the object's fields and method or constructor parameters with the same names.
• Pass the current object as an argument to other methods.
• Call other constructors within a constructor (using this(...)).

Example:

public class Person {
    private String name;

    public Person(String name) {
        this.name = name; // this.name is the object's field, name is the parameter
    }

    public void printName() {
        System.out.println(this.name); // referring to the current object's field
    }
}