1    package arraylists;
2    
3    import java.util.ArrayList;
4    import java.util.List;
5    
6    public class ArrayListProcessing {
7        public static void main (String[] args) {
8                        //POINT A: ADD SOME STRINGS WHICH REPRESENT NAMES TO AN ARRAYLIST
9                        List<String> names = new ArrayList<>();
10                       names.add("Holiday, Billie");
11                       names.add("Claudel, Camille");
12                       names.add("Picasso, Pablo");
13                       names.add("Gallen-Kallela, Akseli");
14                       names.add("Zotto, Osvaldo");
15                       names.add("Bailey, Jordan");
16                       names.add("Reeves, Keanu");
17                       names.add("Smith, Will");
18   
19                      // Point B: Create an ArrayList of just the first names of the names ArrayList.
20                      //Use a for loop to print out the names, separated by spaces.
21                      List<String> firstNamesList = firstNames(names);
22   
23                      System.out.print("First names: ");
24                      for (String firstName : firstNamesList) {
25                              System.out.print(firstName + " ");
26                          }
27                      System.out.println();
28   
29                      // Point C: Use String's join function to create and print a String of just the first names of the names
30                      // ArrayList with each name separated by a comma.
31                      String firstNames = String.join(", ", firstNamesList);
32                      System.out.println("First names: " + firstNames);
33   
34                      // Point D: By analogy from points B and C, print a comma-separated list of the last names
35                      // in the names ArrayList.
36                      List<String> lastNamesList = lastNames(names);
37   
38                      System.out.print("Last names: ");
39                      for (String lastName : lastNamesList) {
40                              System.out.print(lastName + " ");
41                          }
42                      System.out.println();
43   
44                      String lastNames = String.join(", ", lastNamesList);
45   
46                      System.out.println("Last names: " + lastNames);
47   
48                      // Point E: Print a comma-separated list of all uppercase first names from the list of names
49                      // in the names ArrayList.
50                      List<String> upperCaseFirstNamesList = upperCaseNames(firstNames(names));
51                      String upperCaseFirstNames = String.join(", ", upperCaseFirstNamesList);
52   
53                      System.out.println("Uppercase first names: " + upperCaseFirstNames);
54   
55                      // Point F: Print a comma-separated list of all hyphenated last names from the list of names in the
56                      // names ArrayList.
57                      List<String> hyphenatedNamesList = upperCaseNames(hyphenatedNames(names));
58                      String hyphenatedNames = String.join(", ", hyphenatedNamesList);
59   
60                      System.out.println("Hyphenated names: " + hyphenatedNames);
61   
62                      // Point G: Print the integer value of the total length of all names in the names ArrayList.
63                      int totalLength = totalNameLength(names);
64   
65                      System.out.println("Total length: " + totalLength);
66   
67                      // Point H: Print the integer value of the total length of all first names in the names ArrayList.
68   
69                      int firstlength = 0;
70                      for (String name : firstNamesList) {
71                              firstlength = firstlength + name.length();
72                          }
73   
74                      System.out.println("Total first name length: " + firstlength);
75                      // Point I: Print the integer value of the product of the length of all the first names
76                      // in the names ArrayList.
77   
78                      int product = 1;
79                      for (String name : firstNamesList) {
80                              product = name.length()*product;
81   
82                          }
83                      System.out.println("Product of first names: " + product);
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 String firstName(String directoryStyleName) {
95                     int commaPos = directoryStyleName.indexOf(",");
96                     return directoryStyleName.substring(commaPos + 2);
97                 }
98   
99                 private static List<String> lastNames(List<String> names) {
100                    List<String> lasts = new ArrayList<>();
101                    for (String name : names) {
102                            lasts.add(lastName(name));
103                        }
104                    return lasts;
105                }
106  
107                private static String lastName(String directoryStyleName) {
108                    int commaPos = directoryStyleName.indexOf(",");
109                    return directoryStyleName.substring(0, commaPos);
110               }
111  
112                public static List<String> upperCaseNames(List<String> names) {
113                    List<String> uppercases = new ArrayList<>();
114                    for (String name : names) {
115                           uppercases.add(name.toUpperCase());
116                       }
117                    return uppercases;
118                }
119  
120                public static List<String> hyphenatedNames(List<String> names) {
121                    List<String> hyphenateds = new ArrayList<>();
122                    for (String name : names) {
123                            if (name.contains("-")) {
124                                    hyphenateds.add(name);
125                                }
126                        }
127                    return hyphenateds;
128                }
129  
130                public static int totalNameLength(List<String> names) {
131                    int totalLength = 0;
132  
133                   for (String name : names) {
134                            totalLength = totalLength + name.length();
135                        }
136                    return totalLength;
137  
138                    }
139                }