What is this in java?

Samuel Fernandes 2109 27 Mar 2015

Ask by Samuel Fernandes

Updated 19 Sep 2020

1 Answers

Anonymous User 27 Mar 2015

In java, this is a reference variable that refers to the current object.

this keyword can be used to refer current class instance variable.
this() can be used to invoke current class constructor.
this keyword can be used to invoke current class method (implicitly)
this can be passed as an argument in the method call.
this can be passed as argument in the constructor call.
this keyword can also be used to return the current class instance.

Without this:

class Student10{  

    int id;  

    String name;  

      

    Student10(int id,String name){  

    id = id;  

    name = name;  

    }  

    void display(){System.out.println(id+" "+name);}  

  

    public static void main(String args[]){  

    Student10 s1 = new Student10(111,"Karan");  

    Student10 s2 = new Student10(321,"Aryan");  

    s1.display();  

    s2.display();  

    }  

}

Using this:

//example of this keyword


class Student11{  

    int id;  

    String name;  

      

    Student11(int id,String name){  

    this.id = id;  

    this.name = name;  

    }  

    void display(){System.out.println(id+" "+name);}  

    public static void main(String args[]){  

    Student11 s1 = new Student11(111,"Karan");  

    Student11 s2 = new Student11(222,"Aryan");  

    s1.display();  

    s2.display();  

}  

}

Markdown for AI

A clean, structured version of this page for AI assistants and LLMs.

Open .md

interview

What is this in java?

Can you answer this question?

1 Answers