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){
        return inputValue.equals(comparableValue);
    }

    /**
     * @param inputValue the value input from user
     * @return the middle character of `inputValue`
     */
    public static Character getMiddleCharacter(String inputValue){
        if(inputValue.length()%2 !=0)
            return inputValue.charAt((inputValue.length()/2));
        else{
                return inputValue.charAt((inputValue.length()/2)-1);
        }
    }

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

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public static String getSecondWord(String spaceDelimitedString){
        for(int i=0;i<spaceDelimitedString.length();i++){
            if(spaceDelimitedString.charAt(i) == ' ')
                return spaceDelimitedString.substring(i+1);
        }
        return null;
    }

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