BankAccountTest.java

 1.// To run the program, use java BankAccountTest
 2.// the output of the program is
 3.// Charles has $18500 in his bank account.
 4.public class BankAccountTest {
 5.   public static void main(String[] args) {
 6.       BankAccount account = new BankAccount("Charles", 20000);
 7.       account.deposit(500);
 8.	  account.withdraw(2000);
 9.	  System.out.println(account.getName() + " has $" + account.getSaving() + 
10.	                   " in his bank account.");
11.    }
12.}

Constructor

Line 5-9 of BankAccount.java declare the constructor of the class BankAccount
Constructor is neither memebers nor methods. We will discuss this in more detail later.
The constructor show us how to initialize the value ( saving and name ).

Syntax

 public classname(arugments) {
   // your code
}

new

The way to create a new object is showed on line 6 
BankAccount account = new BankAccount("Charles", 20000);
new BankAccount("Charles", 20000) return an instance (object) of class BankAccount, with name is Charles and saving is 20000.

Syntax 

new classname(argument)

Method

Refer to line 7 , 8 and 9. To access the methods, we use the following syntax 
account.deposit(500);
  |        |     | 
  |        |     | 
object   method  arguments
name     name

Syntax 

objectname.methodname(arguments)

Summary

After this section, you should know how to