CS1 Standard Demo Page

/*
 *A program to perform some basic operations on a list of String names
 */

package arraylistplay;

import java.util.ArrayList;
import java.util.List;

public class ArrayListProcessing {

    public static void main(String[] args) {
        List names = new ArrayList<>();
        names.add("Holiday, Billie");
        names.add("Claudel, Camille");
        names.add("Picasso, Pablo");
        names.add("Gallen-Kallela, Akseli");
        names.add("Zotto, Osvaldo");

        //Point B
        List firstNamesList = firstNames(names);

        System.out.print("First names: ");
        for (String firstName : firstNamesList){
            System.out.print(firstName + " ");
        }
        System.out.println();

        //Point C
        String firstNames = String.join(", ", firstNamesList);
        System.out.println("First names: " + firstNames);

        //Point D
        List lastNamesList = lastNames(names);

        System.out.print("Last Name: ");
        for (String lastName : lastNamesList){
            System.out.print(lastName + " ");
        }
        System.out.println();

        String lastNames = String.join(", ", lastNamesList);
        System.out.println("Last names:" + lastNames);

        //Point E
        List upperCaseFirstNamesList = upperCaseNames(firstNames(names));
        String upperCaseFirstNames = String.join(", ", upperCaseFirstNamesList);
        System.out.println("Uppercase first names: " + upperCaseFirstNames);

        //Point F
        List hyphenatedLastNamesList = hyphenatedNames(lastNames(names));
        String hyphenatedLastNames = String.join("-", hyphenatedLastNamesList);
        System.out.println("Hyphenated Last Names; " + hyphenatedLastNames);

        //Point G
        int totalLength = totalNameLength(names);
        System.out.println("Total length: " + totalLength);

        //Point H
        int totalLengthFirstNames = totalNameLength(firstNames(names));
        System.out.println("First Name Length: " + totalLengthFirstNames);

        //POINT I
        int productOfNames = totalLengthOfNamesProduct(names);
        System.out.println("Product of Names: " + productOfNames);
    }
    private static String firstName(String directoryStyleName) {
        int positionOfComma = directoryStyleName.indexOf(",");
        String firstName = directoryStyleName.substring(positionOfComma + 2);
        return firstName;
    }
    private static String lastName(String directoryStyleName) {
        int positionOfComma = directoryStyleName.indexOf(",");
        String lastName = directoryStyleName.substring(0, positionOfComma);
        return lastName;
    }
    private static List firstNames(List names){
        List firsts = new ArrayList<>();
        for (String name : names){
            firsts.add(firstName(name));
        }
        return firsts;
    }

    private static List lastNames(List names){
        List lasts = new ArrayList<>();
        for (String name : names){
            lasts.add(lastName(name));
        }
        return lasts;
    }
    public static List upperCaseNames(List names){
        List uppercases = new ArrayList<>();
        for (String name : names){
            uppercases.add(name.toUpperCase());
        }
        return uppercases;
    }
    public static List hyphenatedNames(List names){
        List hyphenateds = new ArrayList<>();
        for (String name: names){
            if (name.contains("-")){
                hyphenateds.add(name);
            }
        }
        return hyphenateds;
    }
    public static int totalNameLength(List names){
        int totalLength = 0;
        for (String name :  names){
            totalLength = totalLength + name.length();
        }
        return totalLength;
    }
    public static int totalLengthOfNamesProduct(List  names){
        int product = 1;
        for (String name : names){
            int nameProduct =  name.length();
            product = nameProduct * product;
        }
        return product;
    }
}