package arraylists; import java.util.ArrayList; import java.util.List; public class ArrayListProcessing { public static void main(String[] args) { // POINT A: Add some strings which represent names to an ArrayList. List<String> names = new ArrayList<>(); names.add("Holiday, Billie"); names.add("Claudel, Camille"); names.add("Picasso, Pablo"); names.add("Gallen-Kallela, Akseli"); names.add("Zotto, Osvaldo"); names.add("Eugen, Prinz"); names.add("Hipper, Admiral"); names.add("HMS, Amazon"); // POINT B: Create an ArrayList of just the first names of the names // ArrayList. Use a for loop to print out the names, separated by spaces. List<String> firstNamesList = firstNames(names); System.out.print("First names: "); for (String firstName : firstNamesList) { System.out.print(firstName + " "); } System.out.println(); // POINT C: Use String's join function to create and print a String of just the first names // of the names ArrayList with each name separated by comma. String firstNames = String.join(", ", firstNamesList); System.out.println("First names: " + firstNames); // POINT D: By analogy from points B and C, print a comma-separated list of the last names in the // names ArrayList. List<String> lastNamesList = lastNames(names); String lastNames = String.join(", ", lastNamesList); System.out.println("Last names: " + lastNames); // POINT E: Print a comma-separated list of all uppercase first names from the list of names in the names ArrayList. List<String> upperCaseFirstNamesList = upperCaseNames(firstNames(names)); String upperCaseFirstNames = String.join(", ", upperCaseFirstNamesList); System.out.println("Uppercase first names: " + upperCaseFirstNames); // POINT F: Print a comma-separated list of all hyphenated last names from the list of names in the names ArrayList. List<String> hyphenatedLastNamesList = hyphenatedNames(lastNames(names)); String hyphenatedLastNames = String.join(", ", hyphenatedLastNamesList); System.out.println("Hyphenated last names: " + hyphenatedLastNames); // POINT G: Print the integer value of the total length of all names in the names ArrayList. int totalLength = totalNameLength(names); System.out.println("Total length: " + totalLength); // POINT H: Print the integer value of the total length of all first names in the names ArrayList. int totalFirstLength = totalNameLength(firstNamesList); System.out.println("Total first name length: " + totalFirstLength); // POINT I: Print the integer value of the product of the length of all first names in the names ArrayList. int productLength = productNameLength(names); System.out.println("Product name length: " + productLength); } public static int productNameLength(List<String> names){ int productLength = 1; for (String name : names){ productLength = productLength * name.length(); } return productLength; } public static int totalNameLength(List<String> names){ int totalLength = 0; for (String name : names){ totalLength = totalLength + name.length(); } return totalLength; } public static List<String> hyphenatedNames(List<String> names){ List<String> hyphenated = new ArrayList<>(); for (String name : names){ if (name.contains("-")){ hyphenated.add(name); } } return hyphenated; } public static List<String> upperCaseNames(List<String> names){ List<String> uppercases = new ArrayList<>(); for(String name : names){ uppercases.add(name.toUpperCase()); } return uppercases; } public static List<String> firstNames(List<String> names){ List<String> firsts = new ArrayList<>(); for (String name : names) { firsts.add(firstName(name)); } return firsts; } public static List<String> lastNames(List<String> names){ List<String> lasts = new ArrayList<>(); for (String name : names) { lasts.add(lastName(name)); } return lasts; } private static String firstName(String directoryStyleName) { int firstNamePosition = directoryStyleName.indexOf(","); String firstName = directoryStyleName.substring(firstNamePosition + 2, directoryStyleName.length()); return firstName; } private static String lastName(String directoryStyleName) { int lastNamePosition = directoryStyleName.indexOf(","); String lastName = directoryStyleName.substring(0, lastNamePosition); return lastName; } }