making/calling a package

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Posts: 51

posted 20 years ago

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package com.javaranch; // does it making a package or calling a package ? but calling needs // import.

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class PostServlet extends HttpServlet
{
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>\n <body>\n");
out.println(" <h2>\n Hello World\n </h2>\n");
out.println(" </body>\n</html>\n");
out.flush();
out.close();
}
}

Leo Deegan

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Posts: 12

posted 20 years ago

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Hi Salvador -

The package declaration indicates the package location of your class. It does not execute a call to the package (in fact, I don't believe packages are executable). In your example, you do not need to import the package com.javaranch.

--Leo

salvador rcn

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Posts: 51

posted 20 years ago

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package com.javaranch; // it is declaring only ?

import java.io.*; // it is calling only ?

wwhat is the difference ?

Leo Deegan

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Posts: 12

posted 20 years ago

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The package line says that your PostServlet class is in the com.javaranch package, which means it is in the subdirectory com/javaranch relative to your source root directory.

If you have the import java.io.* line, you are indicating that your class can use the java.io package classes without fully qualifying their names. If you notice, your class can use a PrintWriter without having to call it java.io.PrintWriter each time you use the PrintWriter name.

When you declare a package, you are not calling the package. When you import the set of classes in a package (e.g., import java.io.*), you are also not making a call.

Jeff Pavlocak

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Posts: 16

posted 20 years ago

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The package statement allows you to group several classes and interfaces together into a "package". You can then reference the classes you created in that package in other java programs by importing the package.

Example:

package com.myNewPackage;

import com.javaranch.*;

public class myNewClass
{
PostServlet ps = new PostServlet();

// more code...
}

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