the "this" factor

[shivang sarawagi]

What is the difference between

class AB
{
int pi;
AB(int ab)
{
pi=ab;
}
}

&

class AB
{
int pi;
AB(int ab)
{
this.pi=ab;
}
}

[Maneesh Godbole]

this is used to indicate the instance variable which is a good coding style.
Your sample code has different variable names. But consider if you have something AB(int pi)
Inside the constructor if you say pi, it will indicate the constructor argument, whereas this.pi indicates the instance variable