CR-MicroLabs-JavaFundamentals-DanDoBetterDrills/StringUtilities.java

import java.lang.*; 
import java.io.*; 
import java.util.*;

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

    /**
     * @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){
        String solution = firstSegment + secondSegment;
        return solution;
    }

    /**
     * @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 convert = Integer.toString(firstSegment);
        String solution = convert + secondSegment;
        return solution;
    }

    /**
     * @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){
        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 length = inputValue.length() - 1; // 6
        int middle = length / 2; //3
        String math = String.valueOf(middle + 1); //4
        int halfway = Integer.valueOf(math); //4
        String thechar = inputValue.substring(halfway - 1, halfway);
        char itsthechar = thechar.charAt(0);
        return itsthechar;
    }

    /**
     * @param spaceDelimitedString a string, representative of a sentence, containing spaces
     * @return the first sequence of characters
     */
    public static String getFirstWord(String spaceDelimitedString){
        String[] splitem = spaceDelimitedString.split("\\s+");
        return splitem[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[] splitem = spaceDelimitedString.split("\\s+");
        return splitem[1];
    }

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