分析下列程序,填上空白处的语句classPoint{//定义坐标类intx,y;Point(inta,intb){x=a;y=b;}}classRec{//定义长方形类intlength,width;Rec(inta1,intb1,intl,intw){super(a1,b1);length=l;width=w;}}c

Question

分析下列程序,填上空白处的语句 class Point {//定义坐标类 int x,y; Point(int a,int b){ x=a; y=b; } } class Rec ___________ {//定义长方形类 int length,width; Rec(int a1,int b1,int l,int w){ super(a1,b1); length=l; width=w; } } class Test{ public static void main(String args[]){ _____________________ //定义名为r1的对象同时初始化坐标为0,0,长度为10,宽度为20 r1.print(); } }

Answer 1

extends Point
Rec r1 = new Rec(0,0,10,20)或者 Point r1 = new Rec(0,0,10,20);