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"Hello World" Project Lauching Problemshooting [message #665855]

Sun, 17 April 2011 07:54

Peggy

Messages: 3
Registered: April 2011
Location: Shanghai

Junior Member

I follow the help menu to create a

Quote:

Hello World

project. But when I execute the 3rd step, it prompts "Selection does not contain a main type",

package helloworld;

public class HelloWorld {System.out.println(Messages.getString("HelloWorld.0")) 
};

Does anybody know expertly the cause to evoke this problem? Please assist!

Yours,
Peggy

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Re: "Hello World" Project Lauching Problemshooting [message #666009 is a reply to message #665855]

Mon, 18 April 2011 15:32

saurav sarkar

Messages: 428
Registered: July 2009

Senior Member

Hi Peggy,

I am not sure the tutorial which you are following.

But this error usually comes if you are running a Java class as a Java application and the class does not contain the public static void main (String args[]) method.

To run any java class as a java application you need to have that method defined somewhere in your class as that is the entry point of the execution.

cheers,
Saurav

My Blog http://codifyit.blogspot.com/
Follow me: http://twitter.com/sauravs

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Re: "Hello World" Project Lauching Problemshooting [message #666081 is a reply to message #666009]

Tue, 19 April 2011 01:53

Peggy

Messages: 3
Registered: April 2011
Location: Shanghai

Junior Member

Saurav,

Thks for your answer.
Just like you said, Before running this "Hello World!" project, the system prompted a frame with two options: Java applet or Java application. I ran the applet and it was void. Then I ran Java application. It shoots the problem:

Quote:

selection doesn't contain a main type.

(1) To run this project in a correct way, what type of element/function should be added to the system.

(2) where to paste the code:

Quote:

System.out.println("HelloWorld")

BTW, The tutorial I read was the help file attached to "Eclipes Version 1.67"( I dowloaded it from the official site). My PC is Windows 7. So I installed the Java JDK.exe package and SDK .exe package.

Saurav, if you know any resources for building sites, please tell me the way to get them.

P.S. I try to view your blog, but it was unable to be opened up. It's a pity to miss your articles.

Anyway, Thanks a lot for your help. I wish we can exchange the learnings. My email address: zhangmeryl@gmail.com

B.R.
Peggy

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Re: "Hello World" Project Lauching Problemshooting [message #666089 is a reply to message #666081]

Tue, 19 April 2011 04:10

Russell Bateman

Messages: 3798
Registered: July 2009
Location: Provo, Utah, USA

Senior Member

On 2011.04.18 19:53, Peggy wrote:
> Saurav,
>
> Thks for your answer. Just like you said, Before running this "Hello
> World!" project, the system prompted a frame with two options: Java
> applet or Java application. I ran the applet and it was void. Then I ran
> Java application. It shoots the problem: Quote:
>> selection doesn't contain a main type.
>
>
> (1) To run this project in a correct way, what type of element/function
> should be added to the system.
> (2) where to paste the code: Quote:
>> System.out.println("HelloWorld")
>
>
> BTW, The tutorial I read was the help file attached to "Eclipes Version
> 1.67"( I dowloaded it from the official site). My PC is Windows 7. So I
> installed the Java JDK.exe package and SDK .exe package.
> Saurav, if you know any resources for building sites, please tell me the
> way to get them.
> P.S. I try to view your blog, but it was unable to be opened up. It's a
> pity to miss your articles.
> Anyway, Thanks a lot for your help. I wish we can exchange the
> learnings. My email address: mailto:zhangmeryl@gmail.com
>
> B.R.
> Peggy

Peggy,

A really good site for beginning tutorials is http://www.vogella.de

Your Java class should look something like this:

public class HelloWorld
{
public static void main( String[] args )
{
System.out.println( "Hello world." );
}
}

Yes, you could dig the message out of some resource as your mysterious
sample code seems to suggest, but that would be for advanced credit,
something to get into down the road when your Java legs are more solid
underneath you. (When you're interested, check out
http://www.javahotchocolate.com/resbundle.html)

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