Java programming 101
So here I am, in class hearing about "Object Technology in Java" and working on some of the examples. Thought I'd share and maybe explain a bit about java in the process.
// First I need to import some predefined libraries that allow me to format text for output, I do this by doing the following.
import java.text.* ;
//Next I create a class called BankAccount with has all the methods I need for my very simplistic bank account.
// now for some variables for our bank account class
double balance; // This will hold the bank account balance
String account; // Our account number
String name; // Name person who owns the account
/*Define format style show doubles when printed look like 1,000.00. If I didn't do this,
it would print out like 1000.0 and not be how the 2 decimal places */
DecimalFormat fmt = new DecimalFormat( "#,##0.00" ) ;
// Here is our deposit method/function. All it requires is the amount of money to be deposited
void deposit(double depositAmount)
balance += depositAmount; // Adds the deposited amount with the current balance
System.out.println ("You deposited: $" + fmt.format(depositAmount)); // print the new balance
// Withdraw method, specify the amount you want to withdraw from the balance
void withdraw (double withdrawAmount)
balance -= withdrawAmount; // subtracts the amount from the balance
System.out.println ("You withdrew: $" + fmt.format(withdrawAmount)); // prints new balance
// Sometimes you just want to print the balance... here is a method that does just that.
System.out.println ("Total amount in your account is is: $" + fmt.format(balance));
// Here is where we define the Bank class.
// Main always gets run when the program is executed, its a static method.
public static void main(String args)
/* Create an instance out of the BankAccount class called myAccount, I can then use the methods in
BankAccount via the object myAccount
BankAccount myAccount = new BankAccount();
// use the methods to set some values and print them off.
myAccount.balance = 5000;
Here is the results when you run the above program, just so you can get a visual:
Total amount in your account is is: $5,000.00
You deposited: $100,000.00
Total amount in your account is is: $105,000.00
You withdrew: $25.15
Total amount in your account is is: $104,974.85