1    /* 
2     * A program to perform some basic operations on a list of String names. 
3     */
4    
5    package arraylists;
6    
7    import java.util.ArrayList;
8    import java.util.List;
9    
10   public class ArrayListProcessing {
11   
12       public static void main(String[] args) {
13           // POINT A: Add some strings which represent names to an ArrayList.
14           List<String> names = new ArrayList<>();
15           names.add("Holiday, Billie");
16           names.add("Claudel, Camille");
17           names.add("Picasso, Pablo");
18           names.add("Gallen-Kallela, Akseli");
19           names.add("Zotto, Osvaldo");
20           names.add("Oshie, TJ");
21           names.add("Carlson, John");
22           names.add("Ovechkin, Alex");
23   
24           // POINT B: Create an ArrayList of just the first names of the names
25           //          ArrayList. Use a for loop to print out the names, separated
26           //          by spaces.
27           List<String> firstNamesList = firstNames(names);
28           System.out.print("First names: ");
29           for (String firstName : firstNamesList) {
30               System.out.print(firstName + " ");
31           }
32           System.out.println();
33   
34           // POINT C: Use String's join function to create and print a String of
35           //          just the first names of the names ArrayList with each
36           //          name separated by a comma
37           String firstNames = String.join(", ", firstNamesList);
38           System.out.println("First names: " + firstNames);
39   
40           // POINT D: By analogy from points B and C, print a comma-separated
41           //          list of the last names in the names ArrayList.
42           List<String> lastNamesList = lastNames(names);
43           String lastNames = String.join(", ", lastNamesList);
44           System.out.println("Last names: " + lastNames);
45   
46           // POINT E: Print a comma-separated list of all uppercase first names
47           //          from the list of names in the names ArrayList.
48           List<String> upperCaseFirstNamesList = upperCaseNames(firstNames(names));
49           String upperCaseFirstNames = String.join(", ", upperCaseFirstNamesList);
50           System.out.println("Uppercase first names: " + upperCaseFirstNames);
51   
52           // POINT F: Print a comma-separated list of all hyphenated last names
53           //          from the list of names in the names ArrayList.
54           List<String> hyphenatedNamesList = hyphenatedNames(lastNames(names));
55           String hyphenatedLastNames = String.join(", ", hyphenatedNamesList);
56           System.out.println("Hyphenated last names: " + hyphenatedLastNames);
57   
58           // POINT G: Print the integer value of the total length of all names
59           //          in the names ArrayList.
60           int totalLength = totalNameLength(names);
61           System.out.println("Total length: " + totalLength);
62   
63           // POINT H: Print the integer value of the total length of all
64           //          first names in the names ArrayList.
65           int firstNameLength = totalNameLength(firstNamesList);
66           System.out.println("First name length: " + firstNameLength);
67   
68           // POINT I: Print the integer value of the product of the length of
69           //          all first names in the names ArrayList.
70           int productOfNameLengths = productOfNameLengths(names);
71           System.out.println("Product of name lengths: " + productOfNameLengths);
72       }
73   
74       private static String firstName(String directoryStyleName) {
75           int comma = directoryStyleName.indexOf(",");
76           String first = directoryStyleName.substring(comma + 2);
77           return first;
78       }
79   
80       private static String lastName(String directoryStyleName) {
81           int comma = directoryStyleName.indexOf(",");
82           String last = directoryStyleName.substring(0, comma);
83           return last;
84       }
85   
86       private static List<String> firstNames(List<String> names) {
87           List<String> firsts = new ArrayList<>();
88           for (String name : names) {
89               firsts.add(firstName(name));
90           }
91           return firsts;
92       }
93   
94       private static List<String> lastNames(List<String> names) {
95          List<String> lasts = new ArrayList<>();
96          for (String name : names) {
97              lasts.add(lastName(name));
98          }
99          return lasts;
100      }
101  
102      public static List<String> upperCaseNames(List<String> names) {
103          List<String> uppercases = new ArrayList<>();
104          for (String name : names) {
105              uppercases.add(name.toUpperCase());
106          }
107          return uppercases;
108      }
109  
110      public static List<String> hyphenatedNames(List<String> names) {
111          List<String> hyphenateds = new ArrayList<>();
112          for (String name : names) {
113              if (name.contains("-")) {
114                  hyphenateds.add(name);
115              }
116          }
117          return hyphenateds;
118      }
119  
120      public static int totalNameLength(List<String> names) {
121          int totalLength = 0;
122          for (String name : names) {
123              totalLength = totalLength + name.length();
124          }
125          return totalLength;
126      }
127  
128      public static int productOfNameLengths(List<String> names) {
129          int productLength = 1;
130          for (String name : names) {
131              productLength = productLength * name.length();
132          }
133          return productLength;
134      }
135  }
136