Java Base access modifier protected

Java access modifier Protected keywords I am puzzled, many people on the internet, the self-annotation of the industry has still not eliminated my understanding of this keyword.

My doubts have the following points:

1: Add protected keyword of the original intention, that is to say: this "protected" principle is what??

2: In the Think in Java, the definition of protected is incorrect.

What is the role of 3:protected?

4: Inheritance is involved.

In the Java programming Mind: By reading, my understanding is:

There are two scenarios for inheriting classes that have protected access modifiers:

(1) Inheritance of different packages.

The book says: In a new package, the class inherits the class from the original package, and can only access the public decorated members in the original class.

(2) Inheritance in the same package:

The class object in the package can access the member variables or methods that are protected decorated

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Java Base access modifier protected