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){
        String n = Integer.toString(firstSegment);
        return n + secondSegment;

    }

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

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

    /**
     * @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){
        return inputValue.equals(comparableValue) ;
    }

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

    /**
    a * @param spaceDelimitedString a string, representative of a sentence, containing spaces
     * @return the first sequence of characters
     */
    public static String getFirstWord(String spaceDelimitedString){
        int str= spaceDelimitedString.indexOf(" ");
        String word = spaceDelimitedString.substring(0, str);

        return word ;
    }

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public static String getSecondWord(String spaceDelimitedString){
        /**int word = spaceDelimitedString.indexOf(" ");
        int word1 = spaceDelimitedString.indexOf("", word );
        String secondWord=spaceDelimitedString.substring(word , word1);
        return secondWord;*/
        return spaceDelimitedString.split(" ")[1];
    }

    /**
     * @param stringToReverse
     * @return an identical string with characters in reverse order.
     */
    public static String reverse(String stringToReverse){
        String reverse="";
        for(int i = stringToReverse.length() - 1; i >= 0; i--)
        {
            reverse = reverse+ stringToReverse.charAt(i);
        }
        return reverse;
    }
}