Demonstrates The Use of The File Class to Create Directories and Manipulate Files

package com.bruceeckel;
 
//: c12:MakeDirectories.java
//Demonstrates the use of the File class to
//create directories and manipulate files.
//{Args: MakeDirectoriesTest}
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.
 
import java.io.File;
 
public class MakeDirectories {
 
    private static void usage() {
	System.err.println("Usage:MakeDirectories path1 ...\n"
		+ "Creates each path\n"
		+ "Usage:MakeDirectories -d path1 ...\n"
		+ "Deletes each path\n"
		+ "Usage:MakeDirectories -r path1 path2\n"
		+ "Renames from path1 to path2");
	System.exit(1);
    }
 
    private static void fileData(File f) {
	System.out.println("Absolute path: " + f.getAbsolutePath()
		+ "\n Can read: " + f.canRead() + "\n Can write: "
		+ f.canWrite() + "\n getName: " + f.getName()
		+ "\n getParent: " + f.getParent() + "\n getPath: "
		+ f.getPath() + "\n length: " + f.length()
		+ "\n lastModified: " + f.lastModified());
	if (f.isFile())
	    System.out.println("It's a file");
	else if (f.isDirectory())
	    System.out.println("It's a directory");
    }
 
    public static void main(String[] args) {
	if (args.length < 1)
	    usage();
	if (args[0].equals("-r")) {
	    if (args.length != 3)
		usage();
	    File old = new File(args[1]), rname = new File(args[2]);
	    old.renameTo(rname);
	    fileData(old);
	    fileData(rname);
	    return; // Exit main
	}
	int count = 0;
	boolean del = false;
	if (args[0].equals("-d")) {
	    count++;
	    del = true;
	}
	count--;
	while (++count < args.length) {
	    File f = new File(args[count]);
	    if (f.exists()) {
		System.out.println(f + " exists");
		if (del) {
		    System.out.println("deleting..." + f);
		    f.delete();
		}
	    } else { // Doesn't exist
		if (!del) {
		    f.mkdirs();
		    System.out.println("created " + f);
		}
	    }
	    fileData(f);
	}
    }
}