1  /*
  2  * Program featuring an arraylist to strore and interactively manipulate a list of animals.
  3  */
  4 package arraylistplay;
  5 
  6 import java.io.File;
  7 import java.io.FileNotFoundException;
  8 import java.io.PrintWriter;
  9 import java.util.ArrayList;
 10 import java.util.Scanner;
 11 import java.util.logging.Level;
 12 import java.util.logging.Logger;
 13 
 14 /**
 15  *
 16  * @author sjenks
 17  */
 18 public class WordList {
 19 //VARIABLES LOCAL TO THE CLASS, AND HENCE GLOBAL TO THE METHODS
 20     private static final int LIMIT = 1000;
 21     private static ArrayList<String> words = new ArrayList <String>(LIMIT);
 22     private static int numberOfWords = 0;
 23     private static Scanner commandReader  = new Scanner(System.in); 
 24     
 25     /**
 26      * @param args the command line arguments
 27      */
 28     
 29     public static void main(String[] args) {
 30         try{ 
 31             //ESTABLISH THE ARRAY OF NUMBERS 
 32             readWords();
 33             //CHECK THE DATA 
 34             System.out.println("/nThe original list of Words...");
 35             displayWords();
 36             //ENTER THE INTERPERETER
 37             interpreter();
 38         } catch (FileNotFoundException ex){
 39             System.out.println ("The file was not found. Please think again.");
 40             System.exit(-1);
 41         }
 42     }
 43     //Assubming that the data file will be found in the public_html/data
 44     //subdirectory of the user's home directory.
 45     private static Scanner establishScanner (String fn) throws FileNotFoundException{
 46         String separator = System.getProperty("file.separator");
 47         String homeDirectory = System.getProperty("user.home");
 48         String path = homeDirectory + separator + "CS1Files" + separator + "data" + separator;
 49         String fullFileName = path + fn;
 50         return new Scanner (new File (fullFileName));
 51     }
 52 
 53     private static void readWords() throws FileNotFoundException {
 54        Scanner scanner = establishScanner ("WordSet.text");
 55        while ( scanner.hasNext()){ 
 56           words.add(scanner.next());
 57            numberOfWords = numberOfWords +1;
 58            
 59        }
 60        
 61     }
 62 
 63     private static void displayWords() {
 64         for ( int x = 0; x< numberOfWords; x= x+1){
 65             System.out.println (words.get (x));
 66         }
 67             
 68     }
 69 
 70     private static void interpreter() {
 71         System.out.print(">>>");
 72         String command = commandReader.next();
 73         if ( command.equalsIgnoreCase("DISPLAY")){
 74             interpreterDisplayCmmand();
 75         }else if ( command.equalsIgnoreCase("PRINT")){
 76             interpreterPrintCommand();
 77         }else if ( command.equalsIgnoreCase("SWAP")){
 78             interpretSwapCommand();
 79         }else if ( command.equalsIgnoreCase("ADD")){
 80             interpretAddCommand();
 81         }else if ( command.equalsIgnoreCase("HELP")){
 82             interpretHelpCommand();
 83         }else if ( command.equalsIgnoreCase("SWAP")){
 84             interpretSwapCommand();
 85         }else if ( command.equalsIgnoreCase("EXIT")){
 86             System.exit(0);
 87         }else{
 88             System.out.println("### Unrecognizable command: " + command);     
 89         }
 90         interpreter();
 91     }
 92 
 93     private static void interpreterDisplayCmmand() {
 94         displayWords();
 95     }
 96 
 97     private static void interpreterPrintCommand() {
 98         String operand = commandReader.next();
 99         if ( operand.equalsIgnoreCase("FIRST")){
100             System.out.println(words.get(0));
101         }else if (operand.equalsIgnoreCase("LAST")){
102             System.out.println(words.get(numberOfWords - 1));
103         }else {
104             int index = Integer.valueOf(operand);
105             System.out.println(words.get(index -1));
106         }
107     }
108 
109     private static void interpretSwapCommand() {
110         int position1 = commandReader.nextInt();
111         int position2 = commandReader.nextInt();
112        String temp = words.get(position1);
113        words.set (position1,words.get(position2));
114        words.set(position2, temp);
115        
116        
117 //        words.get(position1-1) = words.get(positoin2-1);
118 //        words.get(positoin2) = temp;
119     }
120 
121     private static void interpretAddCommand() {
122         String position = commandReader.next();
123         if (position.equalsIgnoreCase("LAST")) {
124             addLast();
125         } else if (position.equalsIgnoreCase("FIRST")) {
126             addFirst();
127         } else {
128             System.out.println("### invalid operand for add command");
129         }
130         numberOfWords = numberOfWords + 1;
131     }
132 
133     private static void interpretHelpCommand() {
134         System.out.println("HELP - display a menu of commands");
135         System.out.println("DISPLAY - display the list of numbers");
136         System.out.println("PRINT - display a number(FIRST; LAST; nth)");
137         System.out.println("SWAP - exchange two elements (nth; mth)");
138         System.out.println("ADD - add a word to the list (FIRST;LAST)");
139         System.out.println("EXIT - terminate execution of the program");
140     }
141 
142     private static void addLast() {
143 //        words [numberOfWords] = commandReader.next();
144         words.add(commandReader.next());
145         
146     }
147 
148     private static void addFirst() {
149 //            words[x] = words[x-1];
150         words.add(0,commandReader.next());
151          }
152 //        words[0] = commandReader.next();
153     }
154     
155 
156