你的问题就在这里建筑物b = new Building（）; //创建对象b

您的构造函数设置为接受两个参数，一个double和一个int，但是你都没有传递。

Your constructor is set up to take two arguments, a double and an int, but you pass neither.

尝试这样的事情删除错误

Try something like this to remove error

double area = 0.0;
int floors = 0;
Building b = new Building(area, floors);

也许更好的想法就是让一个没有参数的构造函数......

Perhaps a better idea would be to just have a constructor that took no parameters...

public Building{
    this.area = 0.0;
    this.floors = 0;
}

我应用这些更改后，代码会编译并运行...（请参阅下图）

After I apply these changes, the code compiles and runs... (see picture below)