Java:Failist lugemine - Redigeerimiste ajalugu

Ago – 3. märts 2015, kell 01:27

2015-03-03T01:27:18Z

Ago – 3. märts 2015, kell 01:26

2015-03-03T01:26:53Z

Ago: Uus lehekülg: 'Koodinäide: import java.io.BufferedReader; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; i...'

2015-03-03T01:14:14Z

Uus lehekülg: 'Koodinäide: <source lang="java"> import java.io.BufferedReader; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; i...'

Uus lehekülg

Koodinäide:

<source lang="java">
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.Scanner;

public class ReadFile {

/**
* Filename to be read.
*/
public static final String FILENAME = "test.txt";

public static void main(String[] args) {
// Files.readAllLines (Java 1.7+)
try {
for (String line : readSmallFile(FILENAME)) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
// BufferedReader
try {
System.out.println(readFileBuffered(FILENAME));
} catch (IOException e) {
e.printStackTrace();
}

// Scanner
try {
System.out.println(readFileScanner(FILENAME));
} catch (IOException e) {
e.printStackTrace();
}
}

/**
* Reads (a small) file and returns list of lines (strings).
* @param filename Filename to be read.
* @return List of lines.
* @throws IOException
*/
public static List<String> readSmallFile(String filename) throws IOException {
Path path = Paths.get(filename);
List<String> lines = Files.readAllLines(path);
return lines;
}

/**
* Reads file using Scanner.
* @param filename filename to be read.
* @return The contents of the file as one string.
* @throws IOException
*/
public static String readFileScanner(String filename) throws IOException {
String ret = "";
Path path = Paths.get(filename);
Scanner scanner = new Scanner(path);
while (scanner.hasNextLine()) {
// "\n" -> newline
ret += scanner.nextLine() + "\n";
}
return ret;
}
/**
* Read file using BufferedReader.
* @param filename Filename to be read.
* @return The contents of the file as one string.
* @throws IOException
*/
public static String readFileBuffered(String filename) throws IOException {
String ret = "";
Path path = Paths.get(filename);
BufferedReader reader = Files.newBufferedReader(path);
String line;
while ((line = reader.readLine()) != null) {
ret += line + "\n";
}
return ret;
}

}
</source>

Kui arendate Eclipse'is, siis vaikimisi loetakse faili projekti juurkaustast. Seega minul on fail "test.txt" kohe projekti all. Sise on järgmine:
<pre>
1
2
3 4
tere
</pre>

←Vanem redaktsioon		Redaktsioon: 3. märts 2015, kell 01:27
137. rida:		137. rida:

	Koodis on näide, kuidas lugeda failist ainult numbreid. Ehk siis juba tuttav <code>Scanner</code> objekt kasutatav ka failide puhul.		Koodis on näide, kuidas lugeda failist ainult numbreid. Ehk siis juba tuttav <code>Scanner</code> objekt kasutatav ka failide puhul.
		+
		+	[[Category:Java juhend\|Failist lugemine]]

@@ 1. rida: / 1. rida: @@
 Koodinäide:
@@ 7. rida: / 11. rida: @@
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
 import java.util.Scanner;
@@ 36. rida: / 41. rida: @@
 		try {
 			System.out.println(readFileScanner(FILENAME));
 		} catch (IOException e) {
 			e.printStackTrace();
@@ 67. rida: / 81. rida: @@
 			ret += scanner.nextLine() + "\n";
+		}
 		return ret;
+	}
@@ 83. rida: / 98. rida: @@
 			ret += line + "\n";
+		}
 		return ret;
+	}
+}
 </source>
-Kui arendate Eclipse'is, siis vaikimisi loetakse faili projekti juurkaustast. Seega minul on fail "test.txt" kohe projekti all. Sise on järgmine:
+Kui arendate Eclipse'is, siis vaikimisi loetakse faili projekti juurkaustast. Seega minul on fail "test.txt" kohe projekti all. Sisu on järgmine:
 <pre>
 4
 tere
 </pre>