Java基础-初始化、初始块

• 什么是初始块
• 类实例化的执行过程（包括初始块）
• 继承、覆盖的理解

public class Demo{
    static class Parent {
        static {
            System.out.println("A");
        }
        {
            System.out.println("B");
        }
        static{
            System.out.println("C");
        }

        public Parent() {
            System.out.println("construct Parent.");
        }

        public void hello(){
            System.out.println("Parent.hello");
        }
    }

    static class Child extends Parent{
        static {
            System.out.println("a");
        }
        {
            System.out.println("b");
        }
        static{
            System.out.println("c");
        }

        public Child() {
            System.out.println("construct Child");
        }

        public void hello(){
            System.out.println("Child.hello");
        }
    }

    public static void main(String[] args) {
        Object child = new Child();
        Parent pp = (Parent) child;
        pp.hello();
    }
}

A
C
a
c
B
construct Parent.
b
construct Child
Child.hello