Take this program: public class Investment { private double balance; private dou

Question

Take this program:


public class Investment
{
private double balance;
private double rate;
private int years;

/**
Constructs an Investment object from a starting balance and
interest rate.
@param aBalance the starting balance
@param aRate the interest rate in percent
*/
public Investment(double aBalance, double aRate)
{
balance = aBalance;
rate = aRate;
years = 0;
}

/**
Keeps accumulating interest until a target balance has
been reached.
@param targetBalance the desired balance
*/
public void waitForBalance(double targetBalance)
{
while (balance < targetBalance)
{
years++;
double interest = balance * rate / 100;
balance = balance + interest;
}
}
/**
Gets the current investment balance.
@return the current balance
*/
public double getBalance()
{
return balance;
}

/**
Gets the number of years this investment has accumulated
interest.
@return the number of years since the start of the investment
*/
public int getYears()
{
return years;
}
}



And add this:

The banks has decided that there is a 5-dollar-per-year fee assessed to each account. Change the waitForBalance method to account for this new fee.

Explanation / Answer

Modified Code:

//Marked in red

public class Investment
{
private double balance;
private double rate;
private int years;

/**
Constructs an Investment object from a starting balance and
interest rate.
@param aBalance the starting balance
@param aRate the interest rate in percent
*/
public Investment(double aBalance, double aRate)
{
balance = aBalance;
rate = aRate;
years = 0;
}

/**
Keeps accumulating interest until a target balance has
been reached.
@param targetBalance the desired balance
*/
public void waitForBalance(double targetBalance)
{
while (balance < targetBalance)
{
years++;
double interest = balance * rate / 100;
balance = balance + interest - 5;
}
}
/**
Gets the current investment balance.
@return the current balance
*/
public double getBalance()
{
return balance;
}

/**
Gets the number of years this investment has accumulated
interest.
@return the number of years since the start of the investment
*/
public int getYears()
{
return years;
}
}

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