Question

Implement a Java class that is called RainFall that uses a double array to store the amount of rainfall for each month of the year. The class should have only one instance variable of type double[]. Implement the following methods in the RainFall class:

1. A constructor that creates and initializes all entries in the array to be -1.

2. toString: a method that returns a one-line String representation of the object that includes 12 double numbers that represent the amount of rain fall in each month of the year.

3. setMonth: a method that takes two inputs parameters where the first parameter is an int that represents is the month number (1 to 12) and the second parameter is a double that represent the rain fall for the month. The method then fills in the array with the given rain fall amount for the given month.

4. getTotal: a method that returns the total rain fall for the year.

5. getMaxRainAmount: a method that returns the value of the maximum rain amount.

6. maxRainMonth: a method that returns the month (as a number between 1 and 12) with the maximum amount of rain fall for that year.

7. greaterThan: a method that takes one input parameter of type double that represents a given amount of rain fall. The method then returns the number of months that has rain fall greater than the input amount.

Part 2: RainFallDriver class Implement a Driver class to test your RainFall class and make sure to call and test all the methods that you implemented in the Part 1 above.

Answer 1

CODE:-

public class HomeworkLib {

    public static void main(String[] args) {

        RainFall rf = new RainFall();

        rf.setMonth(1, 1.5);

        rf.setMonth(2, 2.5);

        rf.setMonth(3, 8.2);

        rf.setMonth(4, 6.5);

        rf.setMonth(5, 9.1);

        rf.setMonth(6, 4.6);

        rf.setMonth(7, 7.6);

        rf.setMonth(8, 11.3);

        rf.setMonth(9, 6.1);

        rf.setMonth(10, 4.5);

        rf.setMonth(11, 9.5);

        rf.setMonth(12, 7.5);

        System.out.println("Max Rainfall is: " + rf.getMaxRainAmount());

        System.out.println("Max Rainfall month is: " + rf.maxRainMonth());

        System.out.println(rf.toString());

        System.out.println("Number of months greater than 7.5: " + rf.greaterThan(7.5));

        System.out.println("Total rain in a year: " + rf.getTotal());

    }

}

class RainFall {

    double arr[] = new double[12]; // double array of length 12

    public RainFall() { // constructor

        for (int i = 0; i < arr.length; i++) {

            arr[i] = -1; // initialising every value to -1

        }

    }

    public String toString() { // creating a string and using for loop adding all the double values to it

        String result = "";

        for (int i = 0; i < 12; i++) {

            result += arr[i] + " ";

        }

        return result;

    }

    public void setMonth(int month, double rain) {

        arr[month - 1] = rain;

    }

    public double getTotal() {

        int sum = 0;

        for (int i = 0; i < arr.length; i++) { // iterating and adding every value

            sum += arr[i];

        }

        return sum;

    }

    public double getMaxRainAmount() {

        double max = arr[0];

        for (int i = 0; i < arr.length; i++) {// getting max by iterating the array and storing the max value

            if (arr[i] > max) {

                max = arr[i];

            }

        }

        return max;

    }

    public String maxRainMonth() {

        double maxrain = getMaxRainAmount(); // first getting the max rain amount

        int month = 0;

        for (int i = 0; i < arr.length; i++) { // then comparing it with the array and taking the index

            if (arr[i] == maxrain) {

                month = i + 1;

            }

        }

        String monthNames[] = { "null", "January", "February", "March", "April", "May", "June", "July", "August",

                "September", "October", "November", "December" };

        return monthNames[month]; // and using that index returning the month name

    }

    public int greaterThan(double value) {

        int result = 0; // simply iterating and comparing to get the number of months having

        // greater rain

        for (int i = 0; i < arr.length; i++) {

            if (arr[i] > value) {

                result++;

            }

        }

        return result;

    }

}

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