JAVA类的实例化顺序

JAVA类的实例化顺序

代码

class Fatherstatic{
    public Fatherstatic(){
        System.out.println("father静态变量");
    }
}
class Childstatic{
    public Childstatic(){
        System.out.println("child静态变量");
    }
}
class Father_not_static{
    public Father_not_static(){
        System.out.println("father 非静态变量");
    }
}
class Child_not_static{
    public Child_not_static(){
        System.out.println("child 非静态变量");
    }
}

class Father {
    static Fatherstatic fatherstatic = new Fatherstatic();
    Father_not_static father_not_static = new Father_not_static();
    static {
        System.out.println("Father静态代码块");
    }   
    {
        System.out.println("Father动态代码块");
    }
    public Father(){
        System.out.println("Father构造器");
    }
}
class Child extends Father {
    static Childstatic childstatic = new Childstatic();
    Child_not_static child_not_static = new Child_not_static();
    static {
        System.out.println("Child静态代码块");
    }
    {
        System.out.println("Child动态代码块");
    }
    public  Child(){
        System.out.println("Child构造器");
    }

    public static void main(String[] args) {
        new Child();
    }
}

运行结果

father静态变量
Father静态代码块
child静态变量
Child静态代码块
father 非静态变量
Father动态代码块
Father构造器
child 非静态变量
Child动态代码块
Child构造器

Process finished with exit code 0

总结

初始化顺序如下：

• 父类静态变量

• 父类静态代码块

• 子类静态变量

• 子类静态代码块

• 父类非静态变量（父类实例成员变量）

• 父类动态代码块

• 父类构造函数

• 子类非静态变量（子类实例成员变量）

• 子类动态代码块

• 子类构造函数