# Investment.java.html

`  1  /**`
`  2     A class to monitor the growth of an investment that `
`  3     accumulates interest at a fixed annual rate`
`  4  */`
`  5  public class Investment`
`  6  {`
`  7     private double balance;`
`  8     private double rate;`
`  9     private int year;`
` 10  `
` 11     /**`
` 12        Constructs an Investment object from a starting balance and`
` 13        interest rate.`
` 14        @param aBalance the starting balance`
` 15        @param aRate the interest rate in percent`
` 16     */`
` 17     public Investment(double aBalance, double aRate)`
` 18     {`
` 19        balance = aBalance;`
` 20        rate = aRate;`
` 21        year = 0;`
` 22     }`
` 23  `
` 24     /**`
` 25        Keeps accumulating interest until a target balance has`
` 26        been reached.`
` 27        @param targetBalance the desired balance`
` 28     */`
` 29     public void waitForBalance(double targetBalance)`
` 30     {`
` 31        while (balance < targetBalance)`
` 32        {`
` 33           year++;   `
` 34           double interest = balance * rate / 100;`
` 35           balance = balance + interest;`
` 36        }`
` 37     }`
` 38  `
` 39     /**`
` 40        Keeps accumulating interest for a given number of years.`
` 41        @param numberOfYears the number of years to wait`
` 42     */`
` 43     public void waitYears(int numberOfYears)`
` 44     {`
` 45        for (int i = 1; i <= numberOfYears; i++)`
` 46        {`
` 47           double interest = balance * rate / 100;`
` 48           balance = balance + interest;`
` 49        }`
` 50        year = year + n;`
` 51     }`
` 52  `
` 53     /**`
` 54        Gets the current investment balance.`
` 55        @return the current balance`
` 56     */`
` 57     public double getBalance()`
` 58     {`
` 59        return balance;`
` 60     }`
` 61  `
` 62     /**`
` 63        Gets the number of years this investment has accumulated`
` 64        interest.`
` 65        @return the number of years since the start of the investment`
` 66     */`
` 67     public int getYears()`
` 68     {`
` 69        return year;`
` 70     }`
` 71  }`