ZCW-Lab-Fundamental-Methods/StringUtilities.java

/**
 * Created by dan on 6/14/17.
 */
public class StringUtilities {
    /**
     * @return `Hello World` as a string
     */
    public 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 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 String concatenation(int firstSegment, String secondSegment){
        return firstSegment + secondSegment;
    }

    /**
     * @param input a string to be manipulated
     * @return the first 3 characters of `input`
     */
    public String getPrefix(String input){
        return input.substring(0,3);
    }

    /**
     * @param input a string to be manipulated
     * @return the last 3 characters of `input`
     */
    public 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 Boolean compareTwoStrings(String inputValue, String comparableValue){
        return inputValue.equals(comparableValue);
    }

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

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

    /**
     * @param spaceDelimitedString a string delimited by spaces
     * @return the second word of a string delimited by spaces.
     */
    public String getSecondWord(String spaceDelimitedString){
        int startIndex = spaceDelimitedString.indexOf(" ") + 1;
        int endIndex = spaceDelimitedString.indexOf(" ", startIndex);
        if(endIndex == -1) {
            endIndex = spaceDelimitedString.length();
        }
        System.out.print(startIndex +""+ endIndex);
        return spaceDelimitedString.substring(startIndex, endIndex); 
    }

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

    /**
     * @param input
     * @return an identical string with spaces removed.
     */
    public String removeWhitespace(String input){
        return input.replaceAll(" ", "");
    }

    /**
     * @param input
     * @return an identical string with spaces in the front and end removed.
     */
    public String trim(String input){
        return input.trim();
    }
}