已阅读这个问题In what order are the different parts of a class initialized when a class is loaded in the JVM?和相关的JLS。我想更详细地知道为什么例如,具有类动物(父)和Dog类(子类)如下:静态块实例块java订购
class Animal
{
static{
System.out.println("This is Animal's static block speaking"):
}
{
System.out.println("This is Animal's instance block speaking");
}
class Dog{
static{
System.out.println("This is Dog's static block speaking");
}
{
System.out.println("This is Dog's instance block speaking");
}
public static void main (String [] args)
{
Dog dog = new Dog();
}
}
好的实例化一个类的直接超类之前需要进行初始化(因此所有的静变量和块需要被执行)。 所以基本上问题是:为什么在初始化超类的静态变量和静态块后,控制下降到静态变量初始化的子类,而不是完成实例成员的初始化?
控制是这样:
superclass (Animal): static variables and static blocks
subclass (Dog): static variables and static blocks
superclass (Animal): instance variables and instance blocks
sublcass (Dog):instance variables and instance blocks
的原因是什么,为什么是这样而不是:
superclass -> static members
superclass -> instance members
subclass -> static members
sublcass-> instance members
我竭力想出这个地方甚至会事(假定超不知道的子类的任何东西)的例子。 – NPE 2013-03-06 17:49:53