Thread: Is is possible multiple public class in one java file? help needed..urgent

I am a new java learner .I just copied these following code from a book and put to the compiler ,there are 2 public classes....the compiler says "The public type RunBank must be defined in its own file".!!! I don't understand whats wrong with it? Is the book wrong?
why the code is not working? help me..plzzzzz

 public class BankAccount 
{ 
     public float balance = 0.0F; 
} 
public class RunBank 
 { 
      public static void main( String args[] ) 
   { 
            System.out.println( "Start main " ); 
            BankAccount richStudent = new BankAccount( ); 
            richStudent.balance = (float) 100000; 
            BankAccount poorInstructor = new BankAccount( ); 
            poorInstructor.balance = 5.10F; 
            System.out.println( "Student Balance: " + 
            richStudent.balance ); 
           System.out.println( "Prof Balance: " + poorInstructor.balance ); 
    } 
}

There can be only one top-level public class per .java file. You can split the two classes into separate .java files in the same package OR leave them as is but remove the 'public' from in front of the BankAccount class.

hi, Thnx for your reply,
if I remove the 'public ' ,then the compiler says : " Error: Main method not found in class BankAccount, please define the main method as:
public static void main(String[] args)".
Would you please edit and give the code.... I just want to do this whole code in one file.

Here's another rule I didn't mention but that should be somewhere in that book you're reading. (You should read more carefully, thoroughly, or both.)

- In order for a Java file to compile to executable code, the Java file that contains the top-level public class with the main() method has to have the same name as the top-level public class with the extension ".java." For example, if the top-level public class that contains the main() method is named "Name," then the file that contains the class must be named "Name.java" in order to be executable once compiled.