Class Variables

1
Class Variables Class Methods

• private static int numObjectsCreated
• public static void getNumObjects()

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Class Variables

• Class Variables
• Also called static fields
• Defined in the class
• Do not belong to individual objects
• Belong to all objects
• All BankAccounts share numberOfAccounts

• Instance Variables
• Each object gets its own variable.
• Each BankAccount has its own balance

3
Example

• public class Client
• private String name, streetNum, streetName,
  city
• private int zipCode, acctNum
• private double balanceOwed
• private static int numClients 0
• private static double totalClientRevenue 0.0
• private static String state CA
• / This example assumes all clients live in
  California. /

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5
Class Methods

• Class Methods
• Perform from the class
• Do not perform on individual objects
• Syntax is
• ClassName.methodName()

• Instance Methods
• Perform on an object
• Syntax is
• objRef.methodName()

6
Example

• public class Client
• public double getBalance() return balance
• public String getStrtNum() return strtNum
• public static int getNumClients()
• return numClients
• public static double getTotalRevenue()
• return totalClientRevenue
• public static String getState()
• return state
• public static void updateAllAccounts()

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8
Example

• public class ClientClient
• Client c1 new Client()
• String c1Adress c1.getStreetNum()
  c1.getStreetName() \n
• c1.getCity() ,
• Client.getState()
• double totalRevenue Client.getTotalRevenue()
• int numClients Client.getNumClients()