java - 防止静态 block 的继承

Question

如果我们运行派生类，它将打印派生类和父类。有什么方法可以防止静态 block 的继承吗？

//第1类

public class parent {
static {
      System.out.println("Parent");
}
}

//类2

public class derived extends parent{
      static {
            System.out.println("derived");
      }

      public static void main(String [] args) {

      }
}

基本上，我在父类中有一些方法，我想继承这些方法，但不希望在实例化派生类时发生在父静态 block 中发生的处理。 .有什么办法可以做到这一点，否则我将不得不重复代码？

Answer 1

不。你不能那样做。 静态initialzier block 不是继承的。静态 block 在类加载时执行，因为您的基类扩展了父类(super class)，甚至在引用您的类时，JVM也会加载父类(super class)定义。

根据 JLS 12.4.1 :

When Initialization Occurs A class or interface type T will be initialized immediately before the first occurrence of any one of the following:

• T is a class and an instance of T is created.

• T is a class and a static method declared by T is invoked.

• A static field declared by T is assigned.

• A static field declared by T is used and the field is not a constant variable (§4.12.4).

• T is a top level class (§7.6), and an assert statement (§14.10) lexically nested within T (§8.1.3) is executed.