What does “this” mean? [duplicate]

Answer 1

"this" is the current object instance.

class Blaa
{
   int bar=0;
   public Blaa()
   {}
   public void mogrify(int bar,Blaa that)
   {
       bar=1; //changes the local variable bar
       this.bar=1; //changes the member variable bar. 
       that.bar=1; //changes "that"'s member variable bar. 
   }

}