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  1. import java.io.*;
  2. import java.util.ArrayList;
  3. import java.util.StringTokenizer;
  4.  
  5. public class FileReader {
  6. 	public static final String PATH_TO_DATA_FILE = "playtennis.data";
  7.  
  8.     public static ArrayList<Record> buildRecords() {
  9. 		BufferedReader reader = null;
  10. 		DataInputStream dis = null;
  11. 		ArrayList<Record> records = new ArrayList<Record>();
  12.  
  13.         try { 
  14.            File f = new File(PATH_TO_DATA_FILE);
  15.            FileInputStream fis = new FileInputStream(f); 
  16.            reader = new BufferedReader(new InputStreamReader(fis));;
  17.  
  18.            // read the first record of the file
  19.            String line;
  20.            Record r = null;
  21.            ArrayList<DiscreteAttribute> attributes;
  22.            while ((line = reader.readLine()) != null) {
  23.               StringTokenizer st = new StringTokenizer(line, ",");
  24.               attributes = new ArrayList<DiscreteAttribute>();
  25.               r = new Record();
  26.  
  27.               if(Hw1.NUM_ATTRS != st.countTokens()) {
  28.             	  throw new Exception("Unknown number of attributes!");
  29.               }
  30.  
  31. 			  @SuppressWarnings("unused")
  32. 			  String day = st.nextToken();
  33. 			  String outlook = st.nextToken();
  34. 			  String temperature = st.nextToken();
  35. 			  String humidity = st.nextToken();
  36. 			  String wind = st.nextToken();
  37. 			  String playTennis = st.nextToken();
  38.  
  39. 			  if(outlook.equalsIgnoreCase("overcast")) {
  40. 				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Overcast));
  41. 			  }
  42. 			  else if(outlook.equalsIgnoreCase("sunny")) {
  43. 				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Sunny));
  44. 			  }
  45. 			  else if(outlook.equalsIgnoreCase("rain")) {
  46. 				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Rain));
  47. 			  }
  48.  
  49. 			  if(temperature.equalsIgnoreCase("hot")) {
  50. 				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Hot));
  51. 			  }
  52. 			  else if(temperature.equalsIgnoreCase("mild")) {
  53. 				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Mild));
  54. 			  }
  55. 			  else if(temperature.equalsIgnoreCase("cool")) {
  56. 				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Cool));
  57. 			  }
  58.  
  59. 			  if(humidity.equalsIgnoreCase("high")) {
  60. 				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.High));
  61. 			  }
  62. 			  else if(humidity.equalsIgnoreCase("normal")) {
  63. 				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.Normal));
  64. 			  }
  65.  
  66. 			  if(wind.equalsIgnoreCase("weak")) {
  67. 				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Weak));
  68.  
  69. 			  }
  70. 			  else if(wind.equalsIgnoreCase("strong")) {
  71. 				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Strong));
  72.  
  73. 			  }
  74.  
  75. 			  if(playTennis.equalsIgnoreCase("no")) {
  76. 				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayNo));
  77. 			  }
  78. 			  else if(playTennis.equalsIgnoreCase("yes")) {
  79. 				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayYes));
  80. 			  }
  81.  
  82. 			  r.setAttributes(attributes);
  83. 			  records.add(r);
  84.            }
  85.  
  86.         } 
  87.         catch (IOException e) { 
  88.            System.out.println("Uh oh, got an IOException error: " + e.getMessage()); 
  89.         } 
  90.         catch (Exception e) {
  91.             System.out.println("Uh oh, got an Exception error: " + e.getMessage()); 
  92.         }
  93.         finally { 
  94.            if (dis != null) {
  95.               try {
  96.                  dis.close();
  97.               } catch (IOException ioe) {
  98.                  System.out.println("IOException error trying to close the file: " + ioe.getMessage()); 
  99.               }
  100.            }
  101.         }
  102. 		return records;
  103. 	}
  104. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:5: error: class FileReader is public, should be declared in a file named FileReader.java
public class FileReader {
       ^
Main.java:8: error: cannot find symbol
    public static ArrayList<Record> buildRecords() {
                            ^
  symbol:   class Record
  location: class FileReader
Main.java:11: error: cannot find symbol
		ArrayList<Record> records = new ArrayList<Record>();
		          ^
  symbol:   class Record
  location: class FileReader
Main.java:11: error: cannot find symbol
		ArrayList<Record> records = new ArrayList<Record>();
		                                          ^
  symbol:   class Record
  location: class FileReader
Main.java:20: error: cannot find symbol
           Record r = null;
           ^
  symbol:   class Record
  location: class FileReader
Main.java:21: error: cannot find symbol
           ArrayList<DiscreteAttribute> attributes;
                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:24: error: cannot find symbol
              attributes = new ArrayList<DiscreteAttribute>();
                                         ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:25: error: cannot find symbol
              r = new Record();
                      ^
  symbol:   class Record
  location: class FileReader
Main.java:27: error: cannot find symbol
              if(Hw1.NUM_ATTRS != st.countTokens()) {
                 ^
  symbol:   variable Hw1
  location: class FileReader
Main.java:40: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Overcast));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:40: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Overcast));
				                                                  ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:43: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Sunny));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:43: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Sunny));
				                                                  ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:46: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Rain));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:46: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Outlook", DiscreteAttribute.Rain));
				                                                  ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:50: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Hot));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:50: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Hot));
				                                                      ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:53: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Mild));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:53: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Mild));
				                                                      ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:56: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Cool));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:56: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Temperature", DiscreteAttribute.Cool));
				                                                      ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:60: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.High));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:60: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.High));
				                                                   ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:63: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.Normal));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:63: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Humidity", DiscreteAttribute.Normal));
				                                                   ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:67: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Weak));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:67: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Weak));
				                                               ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:71: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Strong));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:71: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("Wind", DiscreteAttribute.Strong));
				                                               ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:76: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayNo));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:76: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayNo));
				                                                     ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
Main.java:79: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayYes));
				                     ^
  symbol:   class DiscreteAttribute
  location: class FileReader
Main.java:79: error: cannot find symbol
				  attributes.add(new DiscreteAttribute("PlayTennis", DiscreteAttribute.PlayYes));
				                                                     ^
  symbol:   variable DiscreteAttribute
  location: class FileReader
33 errors
stdout 
Standard output is empty
https://ideone.com/I0l7zy
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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