/**
 * Example of showing how to test if a file is readable and
 * if it does, how to read the file efficiently.
 *
 * Classroom example.
 */
import java.io.*;

public class TestFile {

  public static void main(String[] args) {

    /*
     * Check input validity
     */
    if (args.length != 1) {
      System.err.println("usage: java TestFile file-name");
      System.exit(1);
    }

    File f = new File(args[0].trim());
    if (f.canRead() == true) {  // accessible
      if (f.isFile() == true) { // is a normal file
	try {
	  DataInputStream d = new DataInputStream
	    (new FileInputStream(f));

	  long len = f.length();
	  byte[] b = new byte[(int)len];
	  d.readFully(b);
	  
	  String content = new String(b);
	  System.out.println(content);
	}
	catch (IOException ignored) {};
      }
      else
	System.err.println("You can't access a directory.");
    }
    else
      System.err.println("You don't have access to this item");
  }
}