filechecking.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package examples.io;

import java.io.*;

/** Class used to demonstrate how to find out
  * information about a file
  */
public class FileChecking {
   /** Test method for the class
     * @param args[0] the filename to be used
     */
   public static void main( String[] args ) {
      if ( args.length < 1 ) {
         System.out.println( "Please supply a "
                             + "filename" );
      } else {
         File f = new File( args[0] );
         if ( f.exists() ) {
            System.out.println( f.getName()
                                + " exists:" );
            if ( f.canRead() ) {
               System.out.println( "\tand can "
                                   + "be read" );
            }
            if ( f.canWrite() ) {
               System.out.println( "\tand can be "
                                   + "written" );
            }
         } else {
            System.out.println( "Sorry, " + args[0]
                                + " doesn't exist" );
         }
      }
   }
}