instance method:
String s = new String("Good");
char c = s.charAt(2);

static:
String.toValue(4);

The difference is that you need to create an object of a class  frist
before you can call  an instace method  of it.\then you need to call
the objects instance  methos, as described above. Static methods  you
don't need to do this. Instead of saying <class>.<method>() it is
<object handle>.<method>()