Class Design: Accessor and Mutator Methods

1
Class Design Accessor and Mutator Methods

• public int getAge()
• public void haveBirthday()
• public void withdraw(double amt)

2
method signature
Access Modifier
Return type
Method Name
Parameters
public
String
getName()
add( )
public
void
int x
public
String
insert(
)
Book b, Chapter chp, int numPages
3
returning a value

• public int sum(int x, int y)
• return x y
• public boolean verify sum(int x, int y, int sum)
• return (x y) sum
• public int getMax(int x, int y)
• if (x gt y)
• return x
• return y

4
returning void

• A return statement ends the method abruptly.
• A return can be used to control the program flow.
• public void verifyAcctBalance(Account acct,
  double balance)
• if (acct.getBalance() balance)
• return
• else
• acct.requestBalanceInvestigation(balance)
• private void calcDayOfMonth()
• dayOfMonth dayOfYear
• if (dayOfMonth lt31 )
• return
• dayOfMonth - 31
• if (!isLeapYear dayOfMonth lt 28)
• return

5
Accessors and Mutators

• Accessor method returns instance variable
  values.
• Mutator method changes instance variable values.