Mega Code Archive
Class with a constructor to initialize instance variables
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public class MainClass
{
public static void main( String args[] )
{
Account account1 = new Account( 50.00 ); // create Account object
Account account2 = new Account( -7.53 ); // create Account object
System.out.printf( "account1 balance: $%.2f\n", account1.getBalance() );
System.out.printf( "account2 balance: $%.2f\n\n", account2.getBalance() );
double depositAmount; // deposit amount read from user
depositAmount = 10.10;
account1.credit( depositAmount ); // add to account1 balance
System.out.printf( "account1 balance: $%.2f\n", account1.getBalance() );
System.out.printf( "account2 balance: $%.2f\n\n", account2.getBalance() );
depositAmount = 12.12;
account2.credit( depositAmount ); // add to account2 balance
System.out.printf( "account1 balance: $%.2f\n", account1.getBalance() );
System.out.printf( "account2 balance: $%.2f\n", account2.getBalance() );
}
}
class Account
{
private double balance; // instance variable that stores the balance
// constructor
public Account( double initialBalance )
{
if ( initialBalance > 0.0 )
balance = initialBalance;
}
public void credit( double amount )
{
balance = balance + amount;
}
public double getBalance()
{
return balance;
}
}
account1 balance: $50.00
account2 balance: $0.00
account1 balance: $60.10
account2 balance: $0.00
account1 balance: $60.10
account2 balance: $12.12
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