Question

In Java:

Main function must be in a separate class called "IncomeDemo"

Write an "Income" class that stores the total monthly income for each of the 12 months into an array of doubles. The class should have methods that return the following:

• total income for the year
• average monthly income
• the month with the highest income
• the month with the lowest income

Write a program that demonstrates this class. You'll need to pass a 12-element double array to the class constructor.

Important: name your class "Income" and your demo program's class "IncomeDemo".

Answer 1

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public class IncomeDemo{

public static void main(String[] args){

double empIncome[] = {754,273,288,288,773,284,884,883,887,242,487,244};

Income income = new Income(empIncome);

System.out.println("Total income for the year is: "+income.totalIncome());

System.out.println("Average monthly income is: "+income.averageIncome());

System.out.println("the month with the highest income is: "+income.highestIncome());

System.out.println("the month with the lowest income is: "+income.lowestIncome());

}

}

class Income{

private double income[];

public Income(double income[]){

this.income = income;

}

public double totalIncome(){

double total = 0.0;

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

total += income[i];

}

return total;

}

public double averageIncome(){

return totalIncome()/12;

}

public int highestIncome(){

int highest = 0;

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

if(income[highest]<income[i])

highest = i;

}

return (highest+1);

}

public int lowestIncome(){

int lowest = 0;

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

if(income[lowest]>income[i])

lowest = i;

}

return (lowest+1);

}

}