Example usage for java.io File File

Introduction

In this page you can find the example usage for java.io File File.

Prototype

public File(URI uri)

Source Link

Document

Creates a new File instance by converting the given file: URI into an abstract pathname.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    JFileChooser chooser = new JFileChooser();
    File f = new File(new File("filename.txt").getCanonicalPath());

    chooser.setDragEnabled(true);// w w  w .  jav a2 s  .c om
    chooser.showDialog(new JFrame(""), null);
    File curFile = chooser.getSelectedFile();
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File file = new File("filename");
    FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
    MappedByteBuffer buf = channel.map(FileChannel.MapMode.READ_WRITE, 0, (int) channel.size());

    buf.put(0, (byte) 0xFF);

    buf.force();/*from  w ww  .ja  v  a2 s  .c o m*/

    channel.close();
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    long length = new File("test.txt").length();
    MappedByteBuffer in = new FileInputStream("test.txt").getChannel().map(FileChannel.MapMode.READ_ONLY, 0,
            length);//from  w ww .  j av a 2s  .c o m
    int i = 0;
    while (i < length)
        System.out.print((char) in.get(i++));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File file = new File("filename");
    FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();
    ByteBuffer readonlybuffer = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) roChannel.size());

    FileChannel rwChannel = new RandomAccessFile(file, "rw").getChannel();
    ByteBuffer writeonlybuffer = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel.size());

    // Create a private (copy-on-write) memory-mapped file.
    FileChannel pvChannel = new RandomAccessFile(file, "rw").getChannel();

    ByteBuffer privatebuffer = roChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel.size());

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    File f = new File("c:/mysql-connector-java-5.1.18-bin.jar");
    URLClassLoader urlCl = new URLClassLoader(new URL[] { f.toURL() }, System.class.getClassLoader());

    Class mySqlDriver = urlCl.loadClass("com.mysql.jdbc.Driver");
    System.out.println(mySqlDriver.newInstance());
    System.out.println("Is this interface? = " + mySqlDriver.isInterface());

    Class interfaces[] = mySqlDriver.getInterfaces();
    int i = 1;/*w  w  w.  j  av  a2 s. c  o  m*/
    for (Class _interface : interfaces) {
        System.out.println("Implemented Interface Name " + (i++) + " = " + _interface.getName());
    }

    Constructor constructors[] = mySqlDriver.getConstructors();
    for (Constructor constructor : constructors) {
        System.out.println("Constructor Name = " + constructor.getName());
        System.out.println("Is Constructor Accessible? = " + constructor.isAccessible());
    }
}

From source file:MainClass.java

public static void main(String[] a) {

    FileReader fr;/*from www  . ja  va2 s .c om*/
    try {
        fr = new FileReader(new File("yourFile.txt"));
        BufferedReader br = new BufferedReader(fr);
        String line = br.readLine();
        while (line != null) {
            System.out.println(line);
            line = br.readLine();
        }
        br.close();

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ZipFile zipFile = new ZipFile(new File("testfile.zip"), ZipFile.OPEN_READ);

    Enumeration zipEntries = zipFile.entries();

    while (zipEntries.hasMoreElements()) {
        System.out.println(((ZipEntry) zipEntries.nextElement()).getName());
    }/*  w  ww . j a v  a  2s  .co m*/
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ZipFile zipFile = new ZipFile(new File("testfile.zip"));

    Enumeration zipEntries = zipFile.entries();

    while (zipEntries.hasMoreElements()) {
        System.out.println(((ZipEntry) zipEntries.nextElement()).getName());
    }/*from   w w w  . ja v a2  s . co  m*/
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    BufferedImage img = ImageIO.read(new File("c:/Java_Dev/a.jpg"));
    int height = img.getHeight();
    int width = img.getWidth();

    System.out.println(height + "  " + width + " " + img.getRGB(30, 30));

    for (int h = 1; h < height; h++) {
        for (int w = 1; w < width; w++) {
            int rgb = img.getRGB(w, h);
            int red = (rgb >> 16) & 0x000000FF;
            int green = (rgb >> 8) & 0x000000FF;
            int blue = (rgb) & 0x000000FF;

            if (red == 0 && green == 0 && blue == 0) {
                System.out.println("Black");
            }//from  www  .j a v  a  2  s.  c o  m
        }
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ZipFile zipFile = new ZipFile(new File("testfile.zip"), ZipFile.OPEN_READ);
    System.out.println(zipFile.getComment());
    Enumeration zipEntries = zipFile.entries();

    while (zipEntries.hasMoreElements()) {
        System.out.println(((ZipEntry) zipEntries.nextElement()).getName());
    }/*ww  w.ja v  a  2s. c om*/
}