Discussion :

[cotede2]

Bonjour , voici le code de lecture de fichier.
Je mets bien le fichier test.txt à la bonne place.

Et pourtant j'ai une erreur exception :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
run:
Exception in thread "main" java.util.NoSuchElementException
        at java.util.Scanner.throwFor(Scanner.java:838)
        at java.util.Scanner.next(Scanner.java:1347)
        at Main.processLine(Main.java:50)
        at Main.processLineByLine(Main.java:25)
        at Main.main(Main.java:8)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
import java.io.*;
import java.util.Scanner;
 
public final class Main {
 
  public static void main(String... aArgs) throws FileNotFoundException {
    Main parser = new Main("C:\\Temp\\test.txt");
    parser.processLineByLine();
    log("Done.");
  }
 
  /**
  * @param aFileName full name of an existing, readable file.
  */
  public Main(String aFileName){
    fFile = new File(aFileName);
  }
 
  /** Template method that calls {@link #processLine(String)}.  */
  public final void processLineByLine() throws FileNotFoundException {
    Scanner scanner = new Scanner(fFile);
    try {
      //first use a Scanner to get each line
      while ( scanner.hasNextLine() ){
        processLine( scanner.nextLine() );
      }
    }
    finally {
      //ensure the underlying stream is always closed
      scanner.close();
    }
  }
 
  /**
  * Overridable method for processing lines in different ways.
  *
  * <P>This simple default implementation expects simple name-value pairs, separated by an
  * '=' sign. Examples of valid input :
  * <tt>height = 167cm</tt>
  * <tt>mass =  65kg</tt>
  * <tt>disposition =  "grumpy"</tt>
  * <tt>this is the name = this is the value</tt>
  */
  protected void processLine(String aLine){
    //use a second Scanner to parse the content of each line
    Scanner scanner = new Scanner(aLine);
    scanner.useDelimiter("=");
    if ( scanner.hasNext() ){
      String name = scanner.next();
      String value = scanner.next();
      log("Name is : " + quote(name.trim()) + ", and Value is : " + quote(value.trim()) );
    }
    else {
      log("Empty or invalid line. Unable to process.");
    }
    //(no need for finally here, since String is source)
    scanner.close();
  }
 
  // PRIVATE //
  private final File fFile;
 
  private static void log(Object aObject){
    System.out.println(String.valueOf(aObject));
  }
 
  private String quote(String aText){
    String QUOTE = "'";
    return QUOTE + aText + QUOTE;
  }
}

merci de votre aide.

[tchize_]

tu ne teste pas hasNext() avant de faire ton second appel à next(). Si il n'y a pas de = sur la ligne, tu n'aura donc qu'un seul élément dans ton Scanner.