java基础学习笔记——静态初始化块，初始化块，构造函数的执行顺序

朴灿烈づ我的快乐病毒、 2021-12-10 07:45 322阅读 0赞

代码：

// 数字即表示执行顺序
    class A {
        
        String filed = func("5: filed of A");
    
        static String staticFiled = func("1: static filed of A");
    
        {
        
            func("6: code block of A");
        }
    
        static {
        
            func("2: static code block of A");
        }
    
    
        A() {
        
            func("7: constructor of A");
        }
    
        static String func(String message) {
        
            System.out.println(message);
            return message;
        }
    }
    
    class B extends A {
        
    
        {
        
            func("8: code block of B");
        }
    
        static {
        
            func("3: static code block of B");// 接着是子类static file和static代码块
        }
    
        B() {
        
            func("10: constructor of B");
        }
    
        String filed = func("9: filed of B");
    
        static String staticFiled = func("4: static filed of B");
    }
    
    
    public class Test1 {
        
        public static void main(String[] args) {
        
            B b = new B();
        }
    }

输出：

1: static filed of A
    2: static code block of A
    3: static code block of B
    4: static filed of B
    5: filed of A
    6: code block of A
    7: constructor of A
    8: code block of B
    9: filed of B
    10: constructor of B

## 总结 ##

1.  static file和static代码块谁在前谁先执行
2.  filed和代码块谁在前谁先执行
3.  构造函数最后执行

参考：

> [Java的初始化块、静态初始化块、构造函数的执行顺序及用途探究][Java]

[Java]: https://www.cnblogs.com/BlackStorm/p/5699965.html