Java This Keyword

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In Java language, 'this' is the keyword which is a reference variable that refers to the current object. The 'this' keyword used inside any method to refer to the current object.

 

  • It is used to refer to the instance variable of the current class.
  • It is used to invoke the method of the current class.
  • It is used to invoke the constructor of the current class.

Syntax:

this

Example:-

See the example below without using this keyword.

class Student{  
	int rollno;  
	String name; 
	Student(int rollno,String name)
    {  
        rollno=rollno;  
        name=name;  
	}  
	void showdata()
    {
    	System.out.println(rollno+" "+name); 
	} 
} 
public class Withoutthiskeyword{  
    public static void main(String args[])
    {  
        Student s1=new Student(111,"Sundarajan"); 
        Student s2=new Student(112,"Backiyalakshmi");  
        s1.showdata();  
        s2.showdata(); 
    }
}
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Example:-

See the example below using this keyword.

 class Student{  
	int rollno;  
	String name; 
	Student(int rollno,String name)
    {  
        this.rollno=rollno;  
        this.name=name;  
	}  
	void showdata()
    {
    	System.out.println(rollno+" "+name);  
	} 
} 
public class Thiskeyword{  
    public static void main(String args[])
    {  
        Student s1=new Student(111,"Sundarajan"); 
        Student s2=new Student(112,"Backiyalakshmi");  
        s1.showdata();  
        s2.showdata(); 
    }
}
Run ›
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