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有如下类声明: class XA { int x; public: XA(int n) {x=n;} }; class XB: public XA{ int y; public: XB(int a,int b); };在构造函数XB的下列定义中,正确的是______。
A.XB:: XB(int a, int b):x(a),y(b) { }
B.XB::XB(int a, int b):XA(a),y(b){}
C.XB::XB(int a,int b):x(a),XB(b)i}
D.XB::XB(int a,int b):XA(a),XB(b){}
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更多 “ 有如下类声明: class XA { int x; public: XA(int n) {x=n;} }; class XB: public XA{ int y; public: XB(int a,int b); };在构造函数XB的下列定义中,正确的是______。A.XB:: XB(int a, int b):x(a),y(b) { }B.XB::XB(int a, int b):XA(a),y(b){}C.XB::XB(int a,int b):x(a),XB(b)i}D.XB::XB(int a,int b):XA(a),XB(b){} ” 相关考题
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阅读以下说明和Java程序,填写程序中的空(1)~(6),将解答写入答题纸的对应栏内。
【说明】
以下Java代码实现一个简单绘图工具,绘制不同形状以及不同颜色的图形。部分接口、类及其关系如图5-1所示。
【Java代码】
interface?DrawCircle?{? //绘制圆形 public(1) ;}class?RedCircle?implements?DrawCircle?{? ?//绘制红色圆形???????public?void?drawCircle(int?radius,intx,?int?y)??{????????????System.out.println("Drawing?Circle[red,radius:"?+?radius?+",x:"?+?x?+?",y:"?+y+?"]");???????}}class?GreenCircle?implements?DrawCircle?{????//绘制绿色圆形??????public?void?drawCircle(int?radius,?int?x,int?y)?{???????????System.out.println("Drawing?Circle[green,radius:"?+radius+",x:?"?+x+?",y:?"?+y+?"]");??????}}abstract?class?Shape?{????//形状? protected? ? (2)???;? ? public?Shape(DrawCircle?drawCircle)?{? ?this.drawCircle=?drawCircle;? ? ? public?abstract?void?draw();}class?Circle?extends?Shape?{? //圆形? ?private?int?x,y,radius;? public?Circle(int?x,int?y,intradius,DrawCircle?drawCircle)?{? ?(3)???;? this.x?=?x;? ? ? this.y?=?y;? ?this.radius?=radius;? }? ? ?public?void?draw()?{? ? drawCircle.? ?(4)? ?;? ? ? }}public?class?DrawCircleMain?{? public?static?void?main(String[]?args)?{? Shape?redCircle=new?Circle(?100,100,10,? (5) );//绘制红色圆形? Shape?greenCircle=new?Circle(200,200,10,(6) );//绘制绿色圆形? ?redCircle.draw(); greenCircle.draw();? ?}}
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