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Java references key things explain java interview question interviewdot

692 views · Published 21 September 2013 · 3:02 · Indexed 14 November 2026

Channel: Interview DOT · 2013 · Science & Technology

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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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