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 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(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, 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 == 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 total = (inputValue.length()) / 2;
        if (inputValue.length() % 2 == 0){
            total -= 1;
        }
        
        return inputValue.charAt(total);
    }

    /**
     * @param spaceDelimitedString a string, representative of a sentence, containing spaces
     * @return the first sequence of characters
     */
    public static String getFirstWord(String spaceDelimitedString){
        String first = "";
        String space = " ";
        
        for (int i = 0; i < spaceDelimitedString.length(); i++){
            if (spaceDelimitedString.charAt(i) == space.charAt(0)){
                break;
            }
            first += spaceDelimitedString.charAt(i);
        }
        
        return first;
    }

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public static String getSecondWord(String spaceDelimitedString){
        String second = "";
        String space = " ";
        boolean word = false;
        
        for (int i = 0; i < spaceDelimitedString.length(); i++){
     
            
            if (spaceDelimitedString.charAt(i) == space.charAt(0) && word == true){
                break;
            }
            
            second += spaceDelimitedString.charAt(i);
            
       if (spaceDelimitedString.charAt(i) == space.charAt(0) && word == false){
                second = "";
            }
        }
        
        return second;
    }

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