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Computer Programming I
COP 2210
Method Overloading
 Overloaded methods are two or more methods of the same class
with the same name but different signatures. I.e., they must
have different numbers of parameters or different types of
parameters, or both.
 Overloaded methods may NOT differ only in the type returned.
 When an overloaded method is called, Java determines exactly
which one to call by examining the argument list.
constructors are commonly overloaded to allow objects to be
created with different numbers of initial values provided.
See, which features our old friend
the BankAccount class, but with two constructors:
public BankAccount (String acctNum, double initialBalance)
accountNumber = acctNum ;
balance = initialBalance ;
Above is the familiar two-argument constructor. It requires
us to pass a String and a double, which are used to
initialize the instance variables accountNumber and balance.
public BankAccount(String acctNum)
accountNumber = acctNum ;
balance = 0 ;
This constructor requires only one String argument. The
BankAccount object created will have the account number we
specify, but will have a “default” initial balance of 0.0.
(If you consult the Java API Documentation for the Rectangle
class, you will see that it has 7 “overloaded” constructors.
Material originally created by Greg Shaw, modified by Caryl Rahn.
I.e., there are 7 different ways to create a Rectangle object)
Material originally created by Greg Shaw, modified by Caryl Rahn.