May I know the difference between a & this.a?

[WhoLetsTheDogsOut]

May I know when to use
int a=9;
and
this.a=10;

[Robert Z]

in a = 9
this.a = 10
this can be useful when u have a public data member a

when u want to set this variabele u can use a function
like setA(int a)
{
this.a = a;
}
this.a refers to the a on the current object class
and a is a local var which scope is during lifetime function setA