calc

import java.text.DecimalFormat;

public class Calc {

    void divide(int x, int y) {
        double z = (double) x / y;
        System.out.println("You divided " + x + " by " + y + ". Result is " + new DecimalFormat("##.##").format(z));
    }

    void multiply(int x, int y) {
        int z = x * y;
        System.out.println("You multiplied " + x + " by " + y + ". Result is " + z);
    }

    void increment(int x, int y) {
        int z = x + y;
        System.out.println("You incremented " + x + " by " + y + ". Result is " + z);
    }

    void decrement(int x, int y) {
        int z = x - y;
        System.out.println("You decremented " + x + " by " + y + ". Result is " + z);
    }

    public static void main(String[] args) {
        Calc t = new Calc();
        InputParser parser = new InputParser();
        InputGetter h = new InputGetter();
        String userInput = h.getUserInput("What would you like to do? \nYou can divide, multiply, increment or decrement two numbers.");
        if (userInput.equals("*") || userInput.equals("/") || userInput.equals("divide") ||userInput.equals("+") || userInput.equals("-")){
            int firstDigit = parser.getFirstDIgitValue();
            int secondDigit = parser.getSecondDigitValue();
            if (userInput.equals("/")|| userInput.equals("divide")) {
                t.divide(firstDigit, secondDigit);
            }
            if (userInput.equals("*")) {
                t.multiply(firstDigit, secondDigit);
            }
            if (userInput.equals("+")){
                t.increment(firstDigit, secondDigit);
            }
            if (userInput.equals("-")) {
                t.decrement(firstDigit, secondDigit);
            }
        } else {
            System.out.print("Sorry, you will have to try again.");
        }
    }
}

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import java.io.*;

public class InputGetter {

    public String getUserInput(String prompt) {
        String inputLine = null;
        System.out.print(prompt + " ");
        try {
            BufferedReader is = new BufferedReader(
                    new InputStreamReader(System.in));
            inputLine = is.readLine();
            if (inputLine.length() == 0 ) return null;
        } catch (IOException e) {
            System.out.println("IOException: " + e);
        }
        return inputLine;
    }
}

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public class InputParser {

    InputGetter h = new InputGetter();

    int getFirstDIgitValue() {
        int firstDigit = Integer.parseInt(h.getUserInput("Please enter the first digit."));
        return firstDigit;
    }

    int getSecondDigitValue() {
        int secondDigit = Integer.parseInt(h.getUserInput("Please enter the second digit."));
        return secondDigit;
    }
}