1. public class BankAccount{
Class Structure
public class BankAccount{
fields
constructor(s)
methods }
Sample Code
Ticket Machine (2.1)
copyright by Scott Grissom

2. also called instance variables use lower case for names
Fields
stores information
also called instance variables
use lower case for names
identify data type
Examples
int balance;
int accountNum;
String name;
Draw object diagram
copyright by Scott Grissom

3. initializes the object to an appropriate state same name as Class
Constructors
initializes the object to an appropriate state
same name as Class
public BankAccount (String name, int id){
name = last;
accountNum = num;
balance = 0; }
copyright by Scott Grissom

4. ask object about its state method signature body
Accessor Methods
ask object about its state
method signature
body
generally contains a return statement
recommend a name starting with ‘get’
public int getBalance ( ){
return balance; }
copyright by Scott Grissom

5. generally changes the object state might ask object to do something
Mutator Methods
generally changes the object state
might ask object to do something
public void makeDeposit (int amount){
balance = balance + amount; }
copyright by Scott Grissom

6. displays results in the terminal window
Print Statements
displays results in the terminal window
public void printStatement( ){
System.out.println(“Bank of GVSU”);
System.out.println(“Name: “ + name);
System.out.println(“Account #: “ + id);
System.out.println(“Balance: “ + balance);
System.out.println(); }
copyright by Scott Grissom

7. ask questions about the TicketMachine code
Group Exercises
ask questions about the TicketMachine code
write a method called identityTheft that sets the balance to zero
write a method makeWithdrawal that removes the provided amount from the balance
write a method setBalance that replaces the existing balance with the provided amount
copyright by Scott Grissom

8. Conditional Statements (2.11)
Sample Code (2.8)
if (some condition){
do if true
}else{
do if false }
boolean expressions
six relational operators
>, <, ==, >=, <=, !=
copyright by Scott Grissom

9. Local variables temporary values public int refundBalance(){
return balance; }
int amountToRefund = balance;
return amountToRefund;
copyright by Scott Grissom

10. Group Exercises 2.51 2.60 2.63 2.66 2.82 result = x + y + z;
result = (x + ) * z;
copyright by Scott Grissom