黑马程序员-学习日记 面向对象（构造函数专题篇）

class Father
{
    Father(int a)
    {
        System.out.println("father run");
    }
}

class Son extends Father
{
    Son()
    {
　　　　　Super(2);
        System.out.println("son run");
    }
    Son(int a)
    {
　　　　　Super(4);
        System.out.println("son run a");
    }
}

//ExtendsDemoFour
class singleMode
{
    public static void main(String[] args)
    {
        Son s = new Son();
        Son s1 = new Son();
    }
}