Question

Can someone please explain? As well as give a short and simple example. Thanks!

Answer 1

this is a reference to the current object, and is implicitly passed into non static methods.
this.x dereferences the reference to get to the “x” attribute.

Use it if you want to disambiguate between a function argument and a class member.

public void setX(int x)
{
    this.x= x;
}

It is valid but redundant in this scenario:

public void setX(int xValue)
{
    this.x= xValue;
}

Or simply:

public void setX(int xValue)
{
    x= xValue;
}