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• This keyword is used to refer to the current class instance variable.
• This keyword is used to invoke the current class method.
• This keyword is used to invoke the current class constructor.

class Student
{  
int rno;  
String name;  
Student(int rno,String name)
{  
this.rno=rno;  
this.name=name;  
}  
void show()
{
System.out.println(rno+" "+name);
}  
}   
class ThisKeyword
{  
public static void main(String args[])
{  
Student s1=new Student(101,"Tanmay");  
Student s2=new Student(102,"Shivam");  
s1.show();  
s2.show();  
}
}
Output:
101 Tanmay
102 Shivam  

2. To invoke the current class method:

class ThisKeyword
{  
void a()
{
System.out.println("a called");
}  
void b()
{  
System.out.println("b called");  
this.a();  
}  
}  
class This1
{  
public static void main(String args[])
{  
ThisKeyword t=new ThisKeyword();  
t.b();  
}
}
Output:
b called
a called  

3. To invoke current class constructor:

class This1
{  
This1()
{
System.out.println("hello");
}  
This1(int x)
{  
this();  
System.out.println(x);  
}  
}  
class This2
{  
public static void main(String args[])
{  
This1 t=new This1(100);  
}
}  
Output:
hello
100