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What are the key things to remember about java references ?

A reference variable can be of only one type, and once declared, that type
can never be changed.

Employe emp = new Employee();

A reference is a variable, so it can be reassigned to other objects, (unless the
reference is declared final).
Employe emp = new Employee();
emp = new Employee();


A reference variable's type determines the methods that can be invoked on
the object the variable is referencing.
CreditAccount creAct = new CreditAccount();
creAct.credit(fromAcc, toAcc);
A reference variable can refer to any object of the same type as the declared
reference, or—this is the big one—it can refer to any subtype of the
declared type.

Account  SavingsAccount
 CurrentAccount
TradeAccount

Account acc = new CurrentAccount();

A reference variable can be declared as a class type or an interface type. If
the variable is declared as an interface type, it can reference any object of any
class that implements the interface.
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