
Concept explainers
Given
//Definition of class "Investment"
public class Investment
{
//Declaring private variables
private double balance;
private double rate;
private int year;
//Declaring an Investment object
public investment(double aBalance,double aRate)
{
balance = aBalance;
rate = aRate;
year = 0;
}
//keeps accumulating interest until a target has been reached
public void waitForBalance(double targetBalance)
{
//while loop executes if balance is less than targetBalance
while(balance < targetBalance)
{
//increment year
year++;
//Declaring variable interest
double interest = balance * rate / 100;
//Defining variable balance
balance = balance + interest;
}
}
//To get the current investment balance
public double getBalance()
{
return balance;
//To get the number of years
public int getYears()
{
return year;
}
}
//Definition of class "InvestmentRunner"
public class InvestmentRunner
{
//Definition of class main
public static void main(String[] args)
{
//initializing the variables INITIAL_BALANCE and RATE
final double INITIAL_BALANCE = 10000;
final double RATE = 10;
//declaring the method investment
investment invest = new investment(INITIAL_BALANCE , RATE);
//declaring method waitForBalance
invest.waitForBalance(2 * INITIAL_BALANCE);
//declaring variable years
int years = invest.getYears();
//Print the statement
System.out.println("The investment doubled after" +years+ “years”);
}
}
Explanation:
In the above program, the class is named as “Investment”. Inside the class “Investment” three private variables are declared. Then an object of class “Investment” is declared. Then the methods for getting the current investment balance and the number of years are declared. Then inside the “InvestmentRunner” class, there is a main class and inside the main class, the variables “INITIAL_BALANCE”, “RATE” are initialized and then displays the number of years when the investment is doubled.

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Chapter 6 Solutions
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