java:exceptions_intro
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| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
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java:exceptions_intro [2015/03/03 06:48] gthanos [Exception Handler] |
java:exceptions_intro [2015/03/03 07:02] gthanos [Exception Handler] |
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| Line 127: | Line 127: | ||
| while ((inputLine = in.readLine()) != null) { | while ((inputLine = in.readLine()) != null) { | ||
| strDocument.append(inputLine); | strDocument.append(inputLine); | ||
| + | throw new IOException(); | ||
| } | } | ||
| + | System.out.println("Closing File!"); | ||
| fReader.close(); | fReader.close(); | ||
| return strDocument.toString(); | return strDocument.toString(); | ||
| Line 136: | Line 138: | ||
| } | } | ||
| catch(IOException ex) { | catch(IOException ex) { | ||
| - | System.out.println("IOException occured while opening file or reading from file "+path); | + | System.out.println("IOException occured while reading from file "+path); |
| - | System.out.println("Exiting..."); | + | |
| - | System.exit(1); | + | |
| } | } | ||
| - | return ""; | + | return "Nothing to return.."; |
| } | } | ||
| | | ||
| Line 153: | Line 153: | ||
| } | } | ||
| - | }</code> | + | } |
| + | </code> | ||
| Παρατηρήστε ότι εμφανίζονται δύο **catch** blocks. Το πρώτο catch block αφορά [[http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html|ΙΟException]] objects, ενώ το δεύτερο catch block αφορά [[http://docs.oracle.com/javase/7/docs/api/java/io/FileNotFoundException.html|FileNotFoundException]] objects. Από τους συνδέσμους που παρατίθενται θα παρατηρήσετε ότι το ''FileNotFoundException'' είναι υποκλάση του ''IOException''. Ο παραπάνω κώδικας θα μπορούσε να παραλείπει τις γραμμές | Παρατηρήστε ότι εμφανίζονται δύο **catch** blocks. Το πρώτο catch block αφορά [[http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html|ΙΟException]] objects, ενώ το δεύτερο catch block αφορά [[http://docs.oracle.com/javase/7/docs/api/java/io/FileNotFoundException.html|FileNotFoundException]] objects. Από τους συνδέσμους που παρατίθενται θα παρατηρήσετε ότι το ''FileNotFoundException'' είναι υποκλάση του ''IOException''. Ο παραπάνω κώδικας θα μπορούσε να παραλείπει τις γραμμές | ||
| Line 170: | Line 171: | ||
| catch(IOException ex) { | catch(IOException ex) { | ||
| System.out.println("IOException occured while opening file or reading from file "+path); | System.out.println("IOException occured while opening file or reading from file "+path); | ||
| - | System.out.println("Exiting..."); | ||
| - | System.exit(1); | ||
| } | } | ||
| catch(FileNotFoundException ex) { | catch(FileNotFoundException ex) { | ||
java/exceptions_intro.txt · Last modified: 2019/04/20 05:02 by gthanos
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