java继承中的初始化循序_java 初始化 add-优快云博客

本文详细解析了Java中类及静态成员的初始化顺序，并通过一个具体示例展示了父类与子类静态成员、实例成员的构造过程。了解这些顺序对于理解Java程序运行机制至关重要。

package test;

class Unit...{
    public Unit(String msg)...{
        System.out.println("Unit constructor "+msg);
    }
}
class Super...{
    private Unit u = new Unit("inside Super");
    private static Unit su1 = new Unit("static field before static block");
    static...{
        System.out.println("Super static ");
    }

    public Super()...{
        System.out.println("Super constructor");
    }

    private static Unit su2 = new Unit("static field after static block");
}
public class Order extends Super...{
    static...{
        System.out.println("Order static");
    }
    public Unit u = new Unit("inside Order");

    public Order()...{
        System.out.println("Order constructor");
    }

    /** *//**
     * @param args
     */
    public static void main(String[] args) ...{
        // TODO Auto-generated method stub
        new Order();
    }
}
//输出：
//Unit constructor static field before static block
//Super static
//Unit constructor static field after static block
//Order static
//Unit constructor inside Super
//Super constructor
//Unit constructor inside Order
//Order constructor