Gravity-Simulator/KeyboardInputClass.java at master · connorsullivan/Gravity-Simulator · GitHub

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import java.io.*;

class KeyboardInputClass {

    static String getKeyboardInput(String prompt) {
        String inputString = "";
        System.out.println(prompt);
        try {
            InputStreamReader reader = new InputStreamReader(System.in);
            BufferedReader buffer = new BufferedReader(reader);
            inputString = buffer.readLine();
        } catch (Exception e) {}
        return inputString;
    }

    static char getCharacter(boolean validateInput, char defaultResult, String validEntries, int caseConversionMode, String prompt) {
        if (validateInput) {
            if (caseConversionMode == 1) {
                validEntries = validEntries.toUpperCase();
                defaultResult = Character.toUpperCase(defaultResult);
            } else if (caseConversionMode == 2) {
                validEntries = validEntries.toLowerCase();
                defaultResult = Character.toLowerCase(defaultResult);
            }
            if ((validEntries.indexOf(defaultResult) < 0))
            {
                validEntries = (new Character(defaultResult)).toString() + validEntries;
            }
        }
        String inputString = "";
        char result = defaultResult;
        boolean entryAccepted = false;
        while (!entryAccepted) {
            result = defaultResult;
            entryAccepted = true;
            inputString = getKeyboardInput(prompt);
            if (inputString.length() > 0) {
                result = (inputString.charAt(0));
                if (caseConversionMode == 1) {
                    result = Character.toUpperCase(result);
                } else if (caseConversionMode == 2) {
                    result = Character.toLowerCase(result);
                }
            }
            if (validateInput) {
                if (validEntries.indexOf(result) < 0) {
                    entryAccepted = false;
                    System.out.println("\nInvalid entry. Select an entry from the characters shown in brackets: [" + validEntries + "]");
                }
            }
        }
        return result;
    }

    static int getInteger(boolean validateInput, int defaultResult, int minAllowableResult, int maxAllowableResult, String prompt) {
        String inputString = "";
        int result = defaultResult;
        boolean entryAccepted = false;
        while (!entryAccepted) {
            result = defaultResult;
            entryAccepted = true;
            inputString = getKeyboardInput(prompt);
            if (inputString.length() > 0) {
                try {
                    result = Integer.parseInt(inputString);
                } catch (Exception e) {
                    entryAccepted = false;
                    System.out.println("\nInvalid entry. Input not recognized.");
                }
            }
            if (entryAccepted && validateInput) {
                if ((result != defaultResult) && ((result < minAllowableResult) || (result > maxAllowableResult))) {
                    entryAccepted = false;
                    System.out.println("\nInvalid entry. Allowable range is from " + minAllowableResult + " to " + maxAllowableResult + ".");
                }
            }
        }
        return result;
    }

    static double getDouble(boolean validateInput, double defaultResult, double minAllowableResult, double maxAllowableResult, String prompt) {
        String inputString = "";
        double result = defaultResult;
        boolean entryAccepted = false;
        while (!entryAccepted) {
            result = defaultResult;
            entryAccepted = true;
            inputString = getKeyboardInput(prompt);
            if (inputString.length() > 0) {
                try {
                    result = Double.parseDouble(inputString);
                } catch (Exception e) {
                    entryAccepted = false;
                    System.out.println("\nInvalid entry. Input not recognized.");
                }
            }
            if (entryAccepted && validateInput) {
                if ((result != defaultResult) && ((result < minAllowableResult) || (result > maxAllowableResult))) {
                    entryAccepted = false;
                    System.out.println("\nInvalid entry. Allowable range is from " + minAllowableResult + " to " + maxAllowableResult + ".");
                }
            }
        }
        return result;
    }

    static String getString(String defaultResult, String prompt) {
        String result = getKeyboardInput(prompt);
        if (result.length() == 0) {
            result = defaultResult;
        }
        return result;
    }

}