Can we define two public classes in a same file?

Is it possible to define two public classes in a same file
Thanks a lot
So jag

Do you realize RMI too, what caused this please!
loading chat.rmi.RMIServer.class for debugging...
chat.rmi.RMIServer.class successfully loaded
java.rmi.StubNotFoundException: Stub class not found: chat.rmi.RMIServer$RemoteLogonManager_Stub; nested exception is:
java.lang.ClassNotFoundException: chat.rmi.RMIServer$RemoteLogonManager_Stub
java.lang.ClassNotFoundException: chat.rmi.RMIServer$RemoteLogonManager_Stub
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:296)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at sun.rmi.server.RemoteProxy.loadClassFromClass(RemoteProxy.java:198)
at sun.rmi.server.RemoteProxy.getStub(RemoteProxy.java:100)
at sun.rmi.server.RemoteProxy.getStub(RemoteProxy.java:62)
at sun.rmi.server.UnicastServerRef.setSkeleton(UnicastServerRef.java:155)
at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:115)
at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:102)
at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:276)
at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:180)
at java.rmi.server.UnicastRemoteObject.<init>(UnicastRemoteObject.java:80)
at java.rmi.server.UnicastRemoteObject.<init>(UnicastRemoteObject.java:67)
at chat.rmi.RMIServer$RemoteLogonManager.<init>(RMIServer.java:23)
at chat.rmi.RMIServer.<init>(RMIServer.java:16)
at chat.rmi.RMIServer.main(RMIServer.java:11)
at symantec.tools.debug.Agent.runMain(Native Method)
at symantec.tools.debug.MainThread.run(Unknown Source)
The communications channel closed.

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If you have two public class in a java file what will be the error ?

Q:If you have two public class in a java file what will be the error and how will you remove that.?

Kannan_S wrote:
I dont want you to be on that list . Here goes my explanation..
A class is well defined with members and functions
An abstract class is not defined well as compared to a full fledged class (talking more generically)
An interface is more abstract.
I was asking the author who has posted this question to be like a class(very clear)
and not either as an abstract class or an interface
Hope i have made it clear..Not in the slightest. This has absolutely no bearing whatsoever on the question asked. Not to mention that classes are classes, and all equal in the eyes of the compiler, be they abstract, concrete or interfaces. It's difficult to see what your point is, to be honest, but I suspect it wouldn't be worth seeing anyway

Why we can have only one public class in one source file

why we can have only one public class in one source file

When the java compiler is run it looks for classes referenced by the classes you are directly compiling. When looking for these referenced classes it looks for source as well as class files and compiles them automatically if the coresponding class files are missing, or older than the source.
In order to do this it must be able to work out the source file name for any given class which might be referenced from another (the rule also applies to package level access).

Two public classes in one source file

Can anyone please explain what is the exact reason why the java source file name should be same as the only allowed public class name in the source file. Answer only if you know the correct answer. No gusses please. I read the other postings on this topic. None of the answers were correct.

One reason is that some RISC processor architectures
(like those Sun uses mostly) have hierarchical memory
architectures. This hierarchy is divided into global
modules and local (global-accessible) submodules. The
advantage of this is that the processor needs lesser
memory access "points" (handles), as the modules
delegate CPU calls to the submodules.
The java compiler can utilize this and increase
performance by loading the entire source files into
the memory and assign them a CPU handle (the module
ID). It'll be later used for linking, e.g. The public
class in a file will be loaded as a module and gets
the handle, all other non-public classes in that file
will be submodules.
If there is no public class, a generic module will be
used, so that's no problem. But if there are multiple
public classes, you'd end up with several modules and
just one handle to assign, thus having ambiguity. The
CPU won't be able to address the correct module.
This all only applies to RISC CPUs, but for obviuos
cross-platform compatibility reasons it was added to
the standard - it doesn't hurt the other
architectures, but helps those with hierarchical
memory management.Thanks, but the rooster explanation makes more sense to me.
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Why it is necessary that public class name should same as filename in java

hi,
why it is necessary that public class name should same as filename in java.
As I know that it is a convention, but I want the information why this convention is made.
thanx.

user13445117 wrote:
but suppose if i am creating a java file with default access modifire then we do not need to save the file name as a class name.So, your question is "Why does the rule about top-level classes being in a file of the same name apply +only+ to public classes"?
If it were applied to all classes, then we could never have two top-level classes in the same file. Doing that is generally not a good idea, but it might be useful from time to time. EJP already told you why it applies to public classes, and, since these are the most common by far, it's a fair compromise that it apply to them but not to other classes.
Was this the reason the original designers did it that way 15 or so years ago? Don't know, don't care, but it's one plausible explanation. Maybe it was just a balance between simplicity and clarity on the one hand, and flexibility on the other.
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863997 wrote:
hi ,
can we create two dashboard prompts for the same column on the same page,
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Antaeus00 wrote:
I tried sending a request for help,
But did you succeeed in sending a request for help?
Did you receive a response? How long has it been since you sent a request?
but I need someone with more authority to talk to.
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Why only one public class in a source file?

why we have to write only one public class in a source file?

PhHein wrote:
Because the JLS says so.It does?
From section 7.6 of the JLS (third edition):
When packages are stored in a file system (§7.2.1), the host system may choose to enforce the restriction that it is a compile-time error if a type is not found in a file under a name composed of the type name plus an extension (such as .java or .jav) if either of the following is true:* The type is referred to by code in other compilation units of the package in which the type is declared.
* The type is declared public (and therefore is potentially accessible from code in other packages).
This restriction implies that there must be at most one such type per compilation unit. This restriction makes it easy for a compiler for the Java programming language or an implementation of the Java virtual machine to find a named class within a package; for example, the source code for a public type wet.sprocket.Toad would be found in a file Toad.java in the directory wet/sprocket, and the corresponding object code would be found in the file Toad.class in the same directory.
>
To my mind, it's strongly recommending, rather than mandating, this practice. All academic of course, merely shifting the answer from "Because the JLS says so" to "Because pretty much all Java compilers say so". I don't know of any that don't enforce this, but of course, that doesn't mean they don't exist

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Can we define two public classes in a same file?

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