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 Word";
    }

    /**
     * @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 firstSegment+secondSegment;
    }

    /**
     * @param input a string to be manipulated
     * @return the first 3 characters of `input`
     */
    public static String getPrefix(String input){
        return input.substring(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()-4);
    }

    /**
     * @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){
        boolean result;
        result = inputValue == comparableValue ? true : false;
        return result;
    }

    /**
     * @param inputValue the value input from user
     * @return the middle character of `inputValue`
     */
    public static Character getMiddleCharacter(String inputValue){
        int midpoint;

        if(inputValue.length()%2!=0){
            midpoint = (inputValue.length()-1)/2;
        } else {
            midpoint = (inputValue.length()/2)-1;
        }

        return inputValue.charAt(midpoint);
    }

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

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public static String getSecondWord(String spaceDelimitedString){
        String word = spaceDelimitedString;
        int delim = word.indexOf(' ');
        return word.substring(delim+1);
    }

    /**
     * @param stringToReverse
     * @return an identical string with characters in reverse order.
     */
    public static String reverse(String stringToReverse){
        StringBuilder builder = new StringBuilder();
        String word = stringToReverse;
  
        for (int i = word.length()-1; i>=0; i--){
            builder.append(word.charAt(i));
        }
        
        String result = builder.toString();
        System.out.println(result);
        return result;
    }
}