I'm trying to optimize this code by:
- condensing repetitive statements
- Improving the code/make it less confusing
- Branch out to include other filing status such as "married""joint" filing status
- branch out to all 50 states
Any suggestions how to do any of these things would be awesome.
/** This program calculates Single-filing 2015 Federal Tax Schedule and Georgia State income Tax For GA residents making >= $7,000 */import java.util.Scanner;public class fedIncomeTax{public static void main(String[] args){Scanner in = new Scanner(System.in);System.out.print("Enter income over $7,000: "); // this is because there are different tax rates for GA residents who earn below that markif (in.hasNextDouble()) // Checks whether the next input is a real number && if false prints error message { double begIncome = in.nextDouble(); // Georgia State tax for incomes >= $7,000 final double GA_TAX_1 = 0.06; final double GA_TAX_2 = 230; // fed tax rates final double FED_TAX_10 = 0.10; // $1 - 9075 final double FED_TAX_15 = 0.15; // $9076 - 36900 final double FED_TAX_25 = 0.25; // $36901 - 89350 final double FED_TAX_28 = 0.28; // $89351 - 186350 final double FED_TAX_33 = 0.33; // $186,351 - 405,100 final double FED_TAX_35 = 0.35; // $405,101 - $406,750 final double FED_TAX_39 = 0.396; // > $406,750 // income brackets final double BRACKET_10 = 9075; final double BRACKET_15 = 36900; final double BRACKET_25 = 89350; final double BRACKET_28 = 186350; final double BRACKET_33 = 405100; final double BRACKET_35 = 406750; final double BRACKET_39 = 406751; // max amount per bracket final double MAX_TAX_15 = 907.50; final double MAX_TAX_25 = 5081.25; final double MAX_TAX_28 = 18193.75; final double MAX_TAX_33 = 45353.75; final double MAX_TAX_35 = 117541.25; final double MAX_TAX_39 = 118118.75; //double begIncome = in.nextDouble(); if (begIncome < 7000) { System.out.println("Error: Please enter an income figure of $7000 or more."); } // Now we know that the user entered a real number else { // Compute taxes by income range if (begIncome <= BRACKET_10) // $1 - 9075 { double govTax = begIncome * (FED_TAX_10); double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_10 && begIncome <= BRACKET_15) // $9076 - 36900 { double govTax = (begIncome - BRACKET_10) * FED_TAX_15 + MAX_TAX_15; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_15 && begIncome <= BRACKET_25) // $36901 - 89350 { double govTax = (begIncome - BRACKET_15) * FED_TAX_25 + MAX_TAX_25; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_25 && begIncome <= BRACKET_28) // $89351 - 186350 { double govTax = (begIncome - BRACKET_25) * FED_TAX_28 + MAX_TAX_28; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_28 && begIncome <= BRACKET_33) // $186,351 - 405,100 { double govTax = (begIncome - BRACKET_28) * FED_TAX_33 + MAX_TAX_33; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_33 && begIncome <= BRACKET_35) // $405,101 - $406,750 { double govTax = (begIncome - BRACKET_33) * FED_TAX_35 + MAX_TAX_35; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } else if (begIncome > BRACKET_35) // > $406,750 { double govTax = (begIncome - BRACKET_35) * FED_TAX_39 + MAX_TAX_39; double localTax = (begIncome * GA_TAX_1) + GA_TAX_2; double totalTax = govTax + localTax; double endIncome = begIncome - totalTax; System.out.printf("Your tax rate is: $ %8.2f\n", totalTax); System.out.printf ("Your ending income is: $ %8.2f", endIncome); } } } else { System.out.println("Error: Please input a numerical value greater than 0."); }}} 
