The meaning of protected access modifier in Java

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Java

Hello everyone!

My question is that:
My project has 2 packages named package1 (with file Circle.java and Test.java inside), package2 (with file Test2.java inside). Class Test2 is subclass of class Circle and Circle has a protected field name z. The situation is like this:

class Circle like this:

package package1;

public class Circle {
	private int x;
	private int y;
	protected int z;
	public Circle()
	{}
}

Class Test2 is like this:

package package2;
import package1.Circle;

public class Test2 extends Circle{
	private Circle c = new Circle(); 
	void modifyCircleObjectState()
	{
		c.z = 20;
	}
}

Eclipse says: The field Circle.z is not visible.
Following the link http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html[^]
I've found that The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.

Alright, Test2 is a subclass of Circle and it's located in another package (in this case package2). So why from Test2 the z field of object c is not visible.

What is wrong with my thinking?

Any help or suggesstion would be appreciated!