Package(s) Automatically imported?

Question

I am new to Java and studying for the SCJP. I ran across a statement that java.lang is automatically imported and it occurred to me that I have not been importing java.io in my initial test programs, but System.out.println() works... so my question is what packages are automatically imported in Java? Thanks.

Answer 1

Thanks for the response - here's how I arrived at my question:
I was looking at a simple example in a book:
import java.io.*;
public class DrinkJava {
public static void main(String args[]) {
System.out.println("Do you like to drink Java?");
I wondered what the import of java.io was for since I haven't been using it, so I went ahead and looked online at the Documentation > APIs > Core API Docs 6 and found "System" via All Classes. The "out" field is static PrintStream, and when I drilled down on it, the PrintStream class is in the java.io package. I noticed the class hierarchy showing it inheriting from the classes java.io.FilterOutputStream, java.io.OutputStream, and java.lang.Object. At this point I wondered if both packages were being automatically imported so the java.lang System class could use the java.io PrintStream class.