java - 为什么下面的 java 代码没有产生错误？ (访问修饰符)

Question

class SomeClass1 {
  void method1() { }
  public void method2() { }
  private void method3() { }
  protected void method4() { }
}
class DemoClass{
  public static void main(String[] parameters) {
    SomeClass1 sc = new SomeClass1();
    sc.method1();
    sc.method2();
    sc.method4();
  }
}

protected 方法只能由继承父类(super class)的类访问。正如我们在这里看到的，DemoClass 没有扩展 SomeClass。但是，它仍然能够访问 protected 方法。这怎么可能？

Answer 1

那是因为它们在同一个包中:

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.

(Link to the documentation)。