初始化块、静态初始化块、构造函数的执行顺序

package com.ocr;

class A {
    static {
        System.out.println("Static init A.");
    }

    {
        System.out.println("Instance init A.");
    }

    A() {
        System.out.println("Constructor A.");
    }
}

class B extends A {
    static {
        System.out.println("Static init B.");
    }

    {
        System.out.println("Instance init B.");
    }

    B() {
        System.out.println("Constructor B.");
    }
}

class C extends B {

    static {
        System.out.println("Static init C.");
    }

    {
        System.out.println("Instance init C.");
    }

    C() {
        System.out.println("Constructor C.");
    }
}

public class Main {

    static {
        System.out.println("Static init Main.");
    }

    {
        System.out.println("Instance init Main.");
    }

    public Main() {
        System.out.println("Constructor Main.");
    }

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

执行结果

Static init Main.
Static init A.
Static init B.
Static init C.
Instance init A.
Constructor A.
Instance init B.
Constructor B.
Instance init C.
Constructor C.

结论:静态代码块优先于说有代码块执行,且从最顶级父类执行

顺序:父类的静态代码块->子类的静态代码块->父类的构造代码块->父类的构造方法->子类的构造代码块->子类的构造方法