关于Rectangle 类

[wuyan19831013]

这个类import java.awt.*;

public class ball{
protected Rectangle location;
protected double dx;
protected double dy;
protected Color color;

public ball(int x,int y,int r){
location =new Rectangle(x-r,y-r,2*r,2*r);
dx=0;
dy=0;
color=Color.blue;
}

public void setColor(Color newColor){
color=newColor;
}

public void setMotion(double ndx,double ndy){
dx=ndx;
dy=ndy;
}

public int radius(){
return location.width/2;
}

public int x(){
return location.x+radius();
}

public int y(){
return location.y+radius();
}

public double xMotion(){
return dx;
}

public double yMotion(){
return dy;
}

public Rectangle region(){
return location;
}

public void moveTO(int x,int y){
location.setLocation(x,y);
}

public void move(){
location.translate((int)dx,(int)dy);
}

public void paint(Graphics g){
g.setColor(Color.red);
g.fillOval(location.x,location.y,location.width,location.height);
}
}

里面关于location.x,location.y,location.width,location.heigth这几个变量的引用都在编译中显示错了，我搞不清楚为什么？？

[wuyan19831013]

不好意思，location =new Rectangle(x-r,y-r,2*r,2*r);//这行显示错误
但我看不出为什么？这个才导致后面错了~~~~`````

[Tasia]

location =new Rectangle(x-r,y-r,2*r,2*r);这一行语法是并没有错呀。
把错误信息贴出来看看。

[wuyan19831013]

我把location =new Rectangle(x-r,y-r,2*r,2*r);这行提出来重新写了 一下
public class b{
protected Rectangle location;

public b(int x,int y,int r){
location=new Rectangle(x-r,y-r,2*r,2*r);
}
}

编译错误如下：
b.java:5:cannot resolve symbol
symbol:canstructor Rectangle(int,int,int,int)
location:class Rectangle
location=new Rectangle(x-r,y-r,2*r,2*r);
^
就这个~~~~~~~~~~~~~

[wuyan19831013]

已解决~~~~~~