Wrapping Your Own Packages

1. There must be no more than one public class per file.
2. All files in the package must be named classname.java where classname is the name of the single public class in the file.
3. At the very top of each file in the package, before any import statements, put the statement

package myPackage;

For example,

package com.macfaq.net;

import java.net.*;

public class URLSplitter {

  public static void main(String[] args) {
   
    for (int i = 0; i < args.length; i++) {
      try {
        URL u = new URL(args[i]);
        System.out.println("Protocol: " + u.getProtocol());
        System.out.println("Host: " + u.getHost());
        System.out.println("Port: " + u.getPort());
        System.out.println("File: " + u.getFile());
        System.out.println("Ref: " + u.getRef());
      }
      catch (MalformedURLException e) {
        System.err.println(args[i] + " is not a valid URL");
      }
    }

  } 

}

The -d flag to the compiler tells it to create the necessary directories such as elharo/net in the specified directory. In this example, URLSplitter.class is placed in /home/elharo/classes/com/macfaq/net. You can use the usual shell syntax such as . for the current directory or ~ for your home directory.