java创建一个长方形类

public class Rectangular{
private double width = 0.0;//长方形的宽
private double height = 0.0//长方形的高
private String fillColor = "";//填充颜色
private String borderColor = "";//边框颜色

//属性的getter、setter方法
public double getWidth(){
return width;
}
public setWidth(double width){
this.width = width;
}
------------------//其他getter setter方法略
//调用该方法，返回面积
public double getArea(){
return width*height;
}
//调用该方法，返回周长
public double getCircumference(){
return (width+height)*2;
}
}

public class ChangFangXing {

private int chang;

private int kuan;

private String tianChongSe;

private String bianKuangse;

public int getChang() {
return this.chang;
}

public void setC