Question

Write Java program( see IncomeTaxClassTemplate) uses a class( TaxTableToolTemplate), which has a tax table built in. The main method prompts for a salary, then uses a TaxTableTools method to get the tax rate. The program then calculates the tax to pay and displays the results to the user. Run the program with annual salaries of 10000, 50000, 50001, 100001 and -1 (to end the program) and note the output tax rate and tax to pay.

a. Modify the TaxTableTools class to use a setter method that accepts a new salary and tax rate table.

b. Modify the program to call the new method, and run the program again, noting the same output.

Sample Input and Output:

Enter annual salary (-1 to exit):
100000
Annual Salary: 100000 Tax rate: 0.35 Tax to pay: 35000

Enter annual salary (-1 to exit):
200000
Annual Salary: 200000 Tax rate: 0.4 Tax to pay: 80000

Enter annual salary (-1 to exit):
-1

IncomeTaxClassTemplate

package Labs.Lab08;

import java.util.Scanner;

public class IncomeTaxClassTemplate {

// Method to prompt for and input an integer

public static int getInteger(Scanner input, String prompt) {

int inputValue;

System.out.println(prompt + ": ");

inputValue = input.nextInt();

return inputValue;

} //

//

***********************************************************************

public static void main (String [] args) {

final String PROMPT_SALARY = "\nEnter annual salary (-1 to exit)";

Scanner scnr = new Scanner(System.in);

int annualSalary;

double taxRate;

int taxToPay;

int i;

int [] salary = { 0, 20000, 50000, 100000,

Integer.MAX_VALUE };

double [] taxTable = { 0.0, 0.15, 0.25, 0.35,

0.40 };

// FIXME: Access the related class to declare a variable with an

instance of TaxTableTools class

// FIXME: Call a setter method in the TaxTableClass that supplies

new

// tables for the class to work with. The method should be

called

// with: table.setTables(salary, taxTable);

// Get the first annual salary to process

annualSalary = getInteger(scnr, PROMPT_SALARY);

while (annualSalary >= 0) {

taxRate = table.getValue(annualSalary);

taxToPay= (int)(annualSalary * taxRate); // Truncate tax to

an integer amount

System.out.println("Annual Salary: " + annualSalary +

"\tTax rate: " + taxRate +

"\tTax to pay: " + taxToPay);

// Get the next annual salary

annualSalary = getInteger(scnr, PROMPT_SALARY);

}

}

}

TaxTableToolsTemplate

package Labs.Lab08;

public class TaxTableToolsTemplate {

/**

* This class searches the 'search' table with a search argument and

returns

* the corresponding value in the 'value' table. Variable 'nEntries'

has the

* number of entries in each table.

*/

private int[] search = { 0, 20000, 50000, 100000,

Integer.MAX_VALUE };

private double[] value = { 0.0, 0.10, 0.20, 0.30, 0.40 };

private int nEntries;

//

***********************************************************************

// Default constructor

public TaxTableToolsTemplate() {

nEntries = search.length; // Set the length of the search

table

}

//

***********************************************************************

// FIXME: Write a void setter method that sets new values for the

private

// search and value tables. Name the method: setTables

// The method receives as parameters tables from which to load the

// search and value tables.

//

***********************************************************************

// Method to get a value from one table based on a range in the

other table

public double getValue(int searchArgument) {

double result;

boolean keepLooking;

int i;

result = 0.0;

keepLooking = true;

i = 0;

while ((i < nEntries) && keepLooking) {

if (searchArgument <= search[i]) {

result = value[i];

keepLooking = false;

} else {

++i;

}

}

return result;

}

}

Answer 1

If you have any doubts, please give me comment...

TaxTableTools.java

public class TaxTableTools {

/**

* This class searches the 'search' table with a search argument and returns the

* corresponding value in the 'value' table. Variable 'nEntries'

*

* has the

*

* number of entries in each table.

*

*/

private int[] search = { 0, 20000, 50000, 100000, Integer.MAX_VALUE };

private double[] value = { 0.0, 0.10, 0.20, 0.30, 0.40 };

private int nEntries;

// ***********************************************************************

// Default constructor

public TaxTableTools() {

nEntries = search.length; // Set the length of the search table

}

// ***********************************************************************

// FIXME: Write a void setter method that sets new values for the private

// search and value tables. Name the method: setTables

// The method receives as parameters tables from which to load the

// search and value tables.

// ***********************************************************************

// Method to get a value from one table based on a range in the other table

public void setTables(int salary[], double taxable[]){

this.search = salary;

this.value = taxable;

}

public double getValue(int searchArgument) {

double result;

boolean keepLooking;

int i;

result = 0.0;

keepLooking = true;

i = 0;

while ((i < nEntries) && keepLooking) {

if (searchArgument <= search[i]) {

result = value[i];

keepLooking = false;

} else {

++i;

}

}

return result;

}

}

IncomeTaxClass.java

import java.util.Scanner;

public class IncomeTaxClass {

// Method to prompt for and input an integer

public static int getInteger(Scanner input, String prompt) {

int inputValue;

System.out.println(prompt + ": ");

inputValue = input.nextInt();

return inputValue;

} //

public static void main(String[] args) {

final String PROMPT_SALARY = "\nEnter annual salary (-1 to exit)";

Scanner scnr = new Scanner(System.in);

int annualSalary;

double taxRate;

int taxToPay;

int i;

int[] salary = { 0, 20000, 50000, 100000, Integer.MAX_VALUE };

double[] taxTable = { 0.0, 0.15, 0.25, 0.35, 0.40 };

// FIXME: Access the related class to declare a variable with an instance of

// TaxTableTools class

TaxTableTools table = new TaxTableTools();

// FIXME: Call a setter method in the TaxTableClass that supplies new

// tables for the class to work with. The method should be called

// with: table.setTables(salary, taxTable);

table.setTables(salary, taxTable);

// Get the first annual salary to process

annualSalary = getInteger(scnr, PROMPT_SALARY);

while (annualSalary >= 0) {

taxRate = table.getValue(annualSalary);

taxToPay = (int) (annualSalary * taxRate); // Truncate tax to an integer amount

System.out.println("Annual Salary: " + annualSalary + "\tTax rate: " + taxRate + "\tTax to pay: " + taxToPay);

// Get the next annual salary

annualSalary = getInteger(scnr, PROMPT_SALARY);

}

}

}