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() {

        String x = "Hello World";
        return x;
    }

    /**
     * @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 complete = firstSegment + secondSegment; 
        return complete; 
    }

    /**
     * @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 complete = firstSegment + secondSegment; 
        return complete;

    }

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

        if(input.length()<= 3){
            return input;
        }
        return input.substring(0,3);

    }

    /**
     * @param input string to be manipulated
     * @return the last 3 characters of `input`
     */
    public static String getSuffix(String input){

        /*
        for(int i = input.length(); i>=0; i-- ){

        hold= hold + input.charAt(i);

        }
         */
        return input.substring(input.length()-3,input.length());

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

    }

    /**
     * @param inputValue the value input from user
     * @return the middle character of `inputValue`
     */
    public static Character getMiddleCharacter(String inputValue){
        int middle;
        char sum1;

        if( inputValue.length() % 2 == 0){
            middle = inputValue.length()/2-1;
            sum1 = inputValue.charAt(middle);
        
        }else{
            middle = inputValue.length()/2;
            sum1 = inputValue.charAt(middle);

        }
        return sum1;

    }

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

        return wordwewant;
        */
       
       return spaceDelimitedString.split(" ")[0];
    }

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

    /**
     * @param stringToReverse
     * @return an identical string with characters in reverse order.
     */
    public static String reverse(String stringToReverse){

        String hold = "";

        for(int i = stringToReverse.length()-1; i>=0; i-- ){

            hold= hold + stringToReverse.charAt(i);

        }
        return hold;
    }
}