CR-MicroLabs-JavaFundamentals-DanDoBetterDrills/StringUtilities.java

/**
 * Created by dan on 6/14/17.
 */
public class StringUtilities {
    /**
     * @return `Hello World` as a string
     */
    public static String getHelloWorld() {
        return ("Hello World");
    }

    /**
     * @param firstSegment a string to be added to
     * @param secondSegment a string to add
     * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
     */
    public static String concatenation(String firstSegment, String secondSegment){
        return (firstSegment + secondSegment);
    }

    /**
     * @param firstSegment a string to be added to
     * @param secondSegment a string to add
     * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
     */
    public static String concatenation(int firstSegment, String secondSegment){
        return ((int)firstSegment + secondSegment);
    }

    /**
     * @param input a string to be manipulated
     * @return the first 3 characters of `input`
     */
    public static String getPrefix(String input){
        
        String upToCharacters = input.substring(0,3);
        System.out.println(upToCharacters);
        return upToCharacters;
    }

    /**
     * @param input a string to be manipulated
     * @return the last 3 characters of `input`
     */
    public static String getSuffix(String input){
        String upToCharacters = input.substring(input.length()-3,input.length());
        return upToCharacters;
    }

    /**
     * @param inputValue the value to be compared
     * @param comparableValue the value to be compared against
     * @return the equivalence of two strings, `inputValue` and `comparableValue`
     */
    public static Boolean compareTwoStrings(String inputValue, String comparableValue){
        if(inputValue == comparableValue){
           
            return true;
        } else {
            return false;
        }
}

    /**
     * @param inputValue the value input from user
     * @return the middle character of `inputValue`
     */
    public static Character getMiddleCharacter(String inputValue){
        int position;
        int length;
        if(inputValue.length() % 2 == 0) {
            position = inputValue.length() / 2 - 1;
            length = 2;
        } else {
            position = inputValue.length() / 2;
            length = 1;
        }
        
        char middleCharacter = inputValue.charAt(position);
        return  middleCharacter;
    }

    /**
     * @param spaceDelimitedString a string, representative of a sentence, containing spaces
     * @return the first sequence of characters
     */
    public static String getFirstWord(String spaceDelimitedString){
        String myString = spaceDelimitedString;
        String arr[] = myString.split(" ");
        return arr[0];
    }

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public static String getSecondWord(String spaceDelimitedString){
        String myString = spaceDelimitedString;
        String arr[] = myString.split(" ");
        return arr[1];
    }

    /**
     * @param stringToReverse
     * @return an identical string with characters in reverse order.
     */
    public static String reverse(String stringToReverse){
        String answer = new StringBuilder(stringToReverse).reverse().toString();
        
        return answer;
    }
}