java:read_from_file
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java:read_from_file [2016/03/19 06:07] 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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| Line 111: | Line 111: | ||
| <code java ReadWithScanner.java> | <code java ReadWithScanner.java> | ||
| import java.util.Scanner; | import java.util.Scanner; | ||
| + | import java.io.File; | ||
| public class ReadWithScanner { | public class ReadWithScanner { | ||
| public static void main(String []args) { | public static void main(String []args) { | ||
| - | String name=null, number=null; | + | String firstname=null, lastname=null, number=null; |
| int i=0; | int i=0; | ||
| TelephoneNumber numbers[] = new TelephoneNumber[5]; | TelephoneNumber numbers[] = new TelephoneNumber[5]; | ||
| try { | try { | ||
| - | Scanner sc = new Scanner("telephone-list.txt"); | + | Scanner sc = new Scanner(new File("telephone-list.txt")); |
| - | + | ||
| - | while( sc.hasNext() ) { | + | while( sc.hasNext() ) { |
| - | if( name == null ) | + | firstname = sc.next(); |
| - | name = sc.next(); | + | lastname = sc.next(); |
| - | else | + | number = sc.next(); |
| - | number = sc.next(); | + | |
| - | if( name != null && number != null) { | + | if( lastname.charAt( lastname.length() -1 ) == ',' ) |
| - | numbers[i++] = new TelephoneNumber(name, number); | + | lastname = lastname.substring(0, lastname.length() -1); |
| - | number = null; | + | |
| - | name = null; | + | numbers[i++] = new TelephoneNumber(firstname+" "+lastname, number); |
| - | } | + | |
| } | } | ||
| - | }catch(Exception ex) { | + | } catch(Exception ex) { |
| ex.printStackTrace(); | ex.printStackTrace(); | ||
| + | } | ||
| + | for(TelephoneNumber telephoneNumber : numbers) { | ||
| + | System.out.println(telephoneNumber); | ||
| } | } | ||
| } | } | ||
| } | } | ||
| </code> | </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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