java:read_from_file
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java:read_from_file [2016/03/19 05:58] gthanos [Χρησιμοποιώντας την κλάση Scanner] |
java:read_from_file [2016/03/19 10:36] gthanos [Παράδειγμα ανάγνωσης με χρήση της Scanner] |
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| * ''public int nextBoolean()'' : Διαβάζει και επιστρέφει μία τιμή boolean. | * ''public int nextBoolean()'' : Διαβάζει και επιστρέφει μία τιμή boolean. | ||
| + | ==== Παράδειγμα ανάγνωσης με χρήση της Scanner ==== | ||
| + | |||
| + | <code java ReadWithScanner.java> | ||
| + | import java.util.Scanner; | ||
| + | import java.io.File; | ||
| + | |||
| + | public class ReadWithScanner { | ||
| + | public static void main(String []args) { | ||
| + | String firstname=null, lastname=null, number=null; | ||
| + | int i=0; | ||
| + | TelephoneNumber numbers[] = new TelephoneNumber[5]; | ||
| + | try { | ||
| + | Scanner sc = new Scanner(new File("telephone-list.txt")); | ||
| + | | ||
| + | while( sc.hasNext() ) { | ||
| + | firstname = sc.next(); | ||
| + | lastname = sc.next(); | ||
| + | number = sc.next(); | ||
| + | |||
| + | if( lastname.charAt( lastname.length() -1 ) == ',' ) | ||
| + | lastname = lastname.substring(0, lastname.length() -1); | ||
| + | |||
| + | numbers[i++] = new TelephoneNumber(firstname+" "+lastname, number); | ||
| + | } | ||
| + | } catch(Exception ex) { | ||
| + | ex.printStackTrace(); | ||
| + | } | ||
| + | for(TelephoneNumber telephoneNumber : numbers) { | ||
| + | System.out.println(telephoneNumber); | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | <WRAP tip 80% center round> | ||
| + | Το παραπάνω παράδειγμα θα μπορούσατε να το εκτελέσετε διαβάζοντας από την κονσόλα, αντί να διαβάζετε από αρχείο προκειμένου να διαβάσετε από την κονσόλα θα μπορούσατε να αντικαταστήσετε την γραμμή | ||
| + | <code java> | ||
| + | Scanner sc = new Scanner(new File("telephone-list.txt")); | ||
| + | </code> | ||
| + | |||
| + | με την γραμμή | ||
| + | |||
| + | <code java> | ||
| + | Scanner sc = new Scanner(System.in); | ||
| + | </code> | ||
| + | </WRAP> | ||
java/read_from_file.txt · Last modified: 2017/04/28 11:15 by gthanos
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