当new()发生时,代码初始化顺序

首先给出要验证的结论:

一、当有static修饰的静态代码时

父类静态代码块(同类内static修饰的属性按顺序执行)>子类静态代码块(同类内static修饰的成员按顺序执行)>父类属性、代码块(按声明顺序执行) >父类构造器>  子类属性、代码块(按声明顺序执行)>子类构造器

二、当没有static修饰的静态代码时

父类属性、代码块(按声明顺序执行) >父类构造器>  子类属性、代码块(按声明顺序执行)>子类构造器

验证一、

class Family {
    Family (Class className) {
        System.out.println("创建Family对象");
        System.out.println(className.getName());
    }
}
class Person {
    Person() {
        System.out.println("创建Person对象");
    }
    public static Family family = new Family(Person.class);
    static {
        System.out.println("执行Person静态代码块");
    }
    {
        System.out.println("执行Person代码块");
    }
}
public class Student extends Person {
public Student() {
        System.out.println("创建student对象");
    }
    {
        System.out.println("执行Student代码块");
    }
    static {
        System.out.println("执行Student静态代码块");
    }
    public static Family staticFamily = new Family(Student.class);
    @Test
    public void test() {
        System.out.println("=============");
    }
    public Family family = new Family(Student.class);
}
执行结果:
创建Family对象
com.tca.thinkInJava.chap7.Person
执行Person静态代码块
执行Student静态代码块
创建Family对象
com.tca.thinkInJava.chap7.Student
执行Person代码块
创建Person对象
执行Student代码块
创建Family对象
com.tca.thinkInJava.chap7.Student
创建student对象

验证二、

//建筑
class Building {
    public Building() {
        System.out.println("Building");
    }
}
//房子
class House extends Building{
    public LivingRoom livingRoom = new LivingRoom();//卧室
    public House() {
        System.out.println("House");
    }
}
//别墅
class Villa extends House{
    public Villa () {
        System.out.println("Villa");
    }
}
//卧室
class LivingRoom {
    public Bed bedFirst = new Bed();//
    public Desk deskFirst = new Desk();//桌子

    public LivingRoom () {
        System.out.println("LivingRoom");
    }
}
//
class Bed {
    public Bed () {
        System.out.println("Bed");
    }
}
//桌子
class Desk {
    public Desk () {
        System.out.println("Desk");
    }
}
此时,我们new Villa():
public class InitializeDemo {
    @Test
    public void testInitialize() {
        Villa villa = new Villa();
    }
}
执行结果为:
Building
Bed
Desk
LivingRoom
House
Villa
原文地址:https://www.cnblogs.com/mwq1992/p/14262396.html