Three top-level compilation units may appear in a file. : Java Source « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Java Source

1.Package declaration
2.Import statements
3.Class, interface, and enum definitions

package com.java2s.com;
import java.util.List;
public class MainClass{
   private int iValue;
}