阅读以下说明和Java程序，将应填入(n)处的字句写在对应栏内。 [说明] 下面程序输出一个矩形面积，以及矩形区域上的假想的作物产量。 [Java程序] public class MainJava { public static void main(String[] args){ Lot_size small=new Lot_size(); Lot_size medium=new Lot_size(); small.set(5,5,5，25); medium.set(10,10,10,50); System.out.println('For a small lot of area' +small.get_area()+'/n'); System.out.println('the actual crops are $' +small.get_data2()+'/n'); System.out.println('and ideal crops are $' +small.get data()+'/n'); System.out.println('For a medium lot of area' +medium.get_area()+“/n”)； System.out.println('the actual crops are $' +medium.get_data2()+'/n'); System.out.println ('and ideal crops are $' +medium.get_data()+'/n'); } } class Crop_assessment{ private int actual_crop; private int ideal_crop; public void set(int in_actual,int in ideal){ actual_crop=in_actual; ideal_crop=in_ideal; } public int get_actual_crop(){return (1) ;} public int get_ideal_crop()(return (2) ;} } class Lot_size{ private int length; private int width; private Crop_assessment crop= (3) ; public void set(int 1,int W,int a,int i){ length=1; width=W; crop.set(a,i); } public int get_area(){return length*width;} public int get_data()freturn (4) ;} public int get_data2()(return (5) ;} }