Cannot run Javas samples in J Builder6

[DGA15]

I am a Java newbie,using JBuilder6
While I can create some simple Java prograams myself,I cannot run Java from other sources. For example:

//from "Thinking in Java",page #120

package hellodate;

import java.util.*;

public class HelloDate {
public static void main(String[] args) {
System.out.println("Hello, it's "
System.out.println(new Date());
}
}
//gives the following error
//"Untitled1.java": Error #: 475 : class HelloDate is public; must be declared in a file named HelloDate.java at line 7, column 8

I obviously don't understandsomething about the structure.
Can you advise me?
In other samples, the code
System.out.println("some string"
ran w/o error but no output appeared on the screen.

 

[meadandale]

public classes must be declared in a file of the same name.

E.g.

public class HelloDate
{
...
}

must be in a file called HelloDate.java

 

[DGA15]

Thank you, it works now.