Java:Failist lugemine

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:

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