Question

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When do you use the “this” keyword?

Hi All,

I am just wondering when and where using the keyword is a MUST? Because sometimes if I dont “this” or even I delete “this” the program just runs fine. So what will happen if you dont use it? or if you USE it in a wrong place.

Some explict examples would be appriciated.

Answer 1

The this keyword is often used to disambiguate between member variables and local variables:

...
{
    int variable = 10;

    this.variable = 1; // modifies a member variable.

    variable = 1; // modifies the local variable.
}
....

The other use of this is to pass a reference to the current object so:

....
DoSomethingWithAnObject( this );
....

Another use (Thanks to HadleyHope ) is to disambiguate when method parameters are assigned to member variables with the same name:

void Initialise( int variable )
{ 
    this.variable = variable;
}