Question

Problem 1
        The United States Federal Income tax for taxes due July 15, 2020
    is available at this link: https://www.bankrate.com/finance/taxes/tax-brackets.aspx
        The four tax filing categories are: 0 - single filer, 2 - head of household, 
        3 - married filing jointly or qualifying widow, and 4 - married filing
        seperately. 
        
        Write a Java program that prompts the user to enter the name, filing status, and
        annual income. The program returns the federal income tax due. (10 Points)
        
        A sample run should look like:
        Enter your name: Jane Doe
        Enter your 2019 federal income: 48,000
        Enter your filing status: single
        
        Jane Doe, the federal income tax for an annual salary of
        48,000 for a single filer is $4,800.
        
        
        Draw a UML diagram for the class. You may use Astah tool. (5 points).
        
        
        Submit both the java code and UML diagram.
*       

Answer 1

Here is the Java code:

import java.util.Scanner;

public class USFederal{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter your name: ");
        String name = scan.nextLine();
        System.out.print("Enter your 2019 federal income: ");
        int income = scan.nextInt();       
        System.out.print("Enter your filing status: ");
        String status = scan.next();

        int tax=0;
        
        if(status.equals("single")){
            if(income>=0 && income<=9750){
                           tax = 10;
            }
            if(income>=9701 && income<=39475){
                            tax = 12;
            }
            if(income>=39476 && income<=82200){
                            tax = 22;
            }
            if(income>=82201 && income<=160725){
                            tax = 24;
            }
            if(income>=160726 && income<=204100){
                            tax = 32;
            }        
            if(income>=204101 && income<=510300){
                            tax = 35;
            }        
            if(income>=510301){
                            tax = 37;
            }        
        }
           

        if(status.equals("head")){
            if(income>=0 && income<=13850){
                           tax = 10;
            }
            if(income>=13851 && income<=52850){
                            tax = 12;
            }
            if(income>=52851 && income<=84200){
                            tax = 22;
            }
            if(income>=84201 && income<=160700){
                            tax = 24;
            }
            if(income>=160701 && income<=204100){
                            tax = 32;
            }        
            if(income>=204101 && income<=510300){
                            tax = 35;
            }        
            if(income>=510301){
                            tax = 37;
            }        
        }

        if(status.equals("married filing jointly")){
            if(income>=0 && income<=19400){
                           tax = 10;
            }
            if(income>=19401 && income<=78950){
                            tax = 12;
            }
            if(income>=78951 && income<=168400){
                            tax = 22;
            }
            if(income>=168401 && income<=321450){
                            tax = 24;
            }
            if(income>=321451 && income<=408200){
                            tax = 32;
            }        
            if(income>=408201 && income<=612350){
                            tax = 35;
            }        
            if(income>=612351){
                            tax = 37;
            }        
        }

        if(status.equals("married filing separately")){
            if(income>=0 && income<=9700){
                           tax = 10;
            }
            if(income>=9701 && income<=39475){
                            tax = 12;
            }
            if(income>=39476 && income<=84200){
                            tax = 22;
            }
            if(income>=84201 && income<=160725){
                            tax = 24;
            }
            if(income>=160726 && income<=204100){
                            tax = 32;
            }        
            if(income>=204101 && income<=306175){
                            tax = 35;
            }        
            if(income>=306176){
                            tax = 37;
            }        
        }
        
        tax = (income/100)*tax;
        System.out.println("\n"+name+", the federal income tax for an annual salary of "+income+" for a "+status+" filer is "+tax);
  }
}

Output:

UML: