"One file has to have one and only one public class", is it right?

[Han Shu]

"One file has to have one and only one public class", is it right?

[Roopa Bagur]

Yes thats right

Originally posted by Han Shu:
"One file has to have one and only one public class", is it right?

[Adam S-R]

Erm well actually
class Test{
public static void main(String[] args){}
}
does compile and run (without output). Does this show that "public" keyowrd if absent is implicitly added to top-level class at compile time? Someone please clarify.
Thanks
Adam

[Han Shu]

Even this one can be compiled without error? I am really confused.
package MyPackage;
class P1{
void afancymethod(){
System.out.println("What a fancy method");
}
}

[Roopa Bagur]

I misunderstood your question.
It is true that you can have only one public class in a file. If you have more than one the compiler will complain
But you don't have to have a public class. When you don't have an access modifier for a class the default is used.Thats the reason for your code to compile with out an error.

Originally posted by Han Shu:
Even this one can be compiled without error? I am really confused.
package MyPackage;
class P1{
void afancymethod(){
System.out.println("What a fancy method");
}
}

[John Bateman]

Hi
A .java class must contain MAXIMUM one public class.
Try these and run each class with "java classname" you'll see the results.
NoPublic.java

class NoPublic {
  public NoPublic() {
  }
  private String someName = "NoPublic Class";
  public String getSomeName() {
    return this.someName;
  }
  public void setSomeName( String someName ) {
    this.someName = someName;
  }
}

TestNoPublic.java

public class TestNoPublic {
  public TestNoPublic() {
  }
  public static void main( String[] args ) {
    NoPublic np = new NoPublic();
    System.out.println( "NoPublic.someName: " + np.getSomeName() );
  }
}

You will have to adjust your package names, AND, the import statement in TestNoPublic to get a good instance of NoPublic.
Hope this helps.

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[This message has been edited by John Bateman (edited September 06, 2001).]

[Guoqiao Sun]

Hi, Shu, one file can contain none or many classes as well as interfaces.
At most one of them can be defined with public modifier. If there is one(either public class or public interface), the file name must be the same as that public class or interface in order to compile properly.

Originally posted by Han Shu:
"One file has to have one and only one public class", is it right?

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Guoqiao Sun
Sun Certified Programmer for Java™ 2 Platform
try my mock exam¹² at my homepage.