A small problem with Java import

The problem has two simple programs that they put in the same directory:
1.
FileName:Test.java
Import Show;
public class Test {
public static void Main (string[] args) {
Show Sungo = new Show ();
Sungo.myname ();
}
}
2.
FileName:Show.java
public class show{
public void MyName () {
System.out.println ("My name is helloworld!");
}
}
After compiling the Show.java, compile Test.java and the following error prompts appear
----------Javac----------
Test.java:3: '. ' Expected
Import Show;
^
1 Error

Output complete (time consuming 1 seconds)-Normal termination

-------------------------------
In the Test.java file
Import Show; After the comment is dropped, it will compile through, execute the Java test.class,
----------Java----------
My name is helloworld!

Output complete (time consuming 0 seconds)-Normal termination
----------------------------

Java compile-time search classpath. ".;" is already set in Classpath, which is the current directory. The editor automatically looks for the class contained in the current directory and joins the import show if it is present; it was superfluous to think that there would be no problem, nor did you see a book stating that there was a problem. Through the above test, found not to do is not to do, useless. The problem was found in an example of a so-called authoritative book, and it was not known whether the author of the book had a test or if he was using a JDK version of another planet.

A simple example of another package and import
Create a new dir folder and put Show.java into the folder to compile.
FileName:Test.java
Import dir. Show;
public class Test {
public static void Main (string[] args) {
Show Sungo = new Show ();
Sungo.myname ();
}
}
FileName:Show.java
Package dir; The new section
public class show{
public void MyName () {
System.out.println ("My name is helloworld!");
}
}
Execution results
----------Java----------
My name is helloworld!

Output complete (time consuming 0 seconds)-Normal termination
----------------------------