ex3.3&3.4 main and class

package richards;


public class ex33 {
	public static void main(String[] args) {
		BankAccountididntstealfrombook testAcct = new BankAccountididntstealfrombook(1000);
		testAcct.Withdraw(500);
		testAcct.Withdraw(400);
		System.out.println(testAcct.GetBalance());
		System.out.println("expected result: 100");
		//This part below for Ex3.4
		testAcct.addInterest(.10);
		System.out.println("the ammount with interest is " + testAcct.GetBalance());
}
}


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package richards;

public class BankAccountididntstealfrombook {

private double balance;

/**
 * constructor for initial balance of balance
 */
public BankAccountididntstealfrombook(double initialValue){
	balance = initialValue;
}

/**
 * deposit some amount into the account
 * @param amount
 */
public void Deposit(double amount){
	balance = balance + amount;
}

/**
 * withdraw some amount from the account
 * @param amount
 */
public void Withdraw(double amount){
	balance = balance - amount;
}

/**
 * get the balance so you can print it or whatever
 * @return
 */
public double GetBalance(){
	return balance;
}

public void addInterest(double rate)
{
	double newBalance;
	newBalance = balance;
	balance = newBalance + balance * rate;
}
}