java中对于有继承关系的加载顺序

父类：
public class A {
    private int i = print("this is a common variable");
    private static int j = print("this is a static common variable");
    public A(){
        System.out.println("this is a construct");
    }

    static {
        System.out.println("this is a static");
    }

    {
        System.out.println("this is a non static");
    }
    static int print(String str){
        System.out.println(str);
        return 2;
    }

}

字类：

public class B extends A{
    private int i = print("this is b common variable");
    private static int j = print("this is b static common variable");
    public B(){
        System.out.println("this is b construct");
    }
    
    static {
        System.out.println("this is b static");
    }
    
    {
        System.out.println("this is b non static");
    }

    public static void main(String[] args) {
        A b=new B();
    }
}

输出结果：

this is a static common variable
this is a static
this is b static common variable
this is b static
this is a common variable
this is a non static
this is a construct
this is b common variable
this is b non static
this is b construct

最后得出类加载顺序为：先按照声明顺序初始化基类静态变量和静态代码块，接着按照声明顺序初始化子类静态变量和静态代码块，而后按照声明顺序初始化基类普通变量和普通代码块，然后执行基类构造函数，接着按照声明顺序初始化子类普通变量和普通代码块，最后执行子类构造函数。