当我运行Rectangle.java时,我可以在Rectangle中获得输入的长度和宽度,但是当我尝试使用吸气剂计算面积/周长时,得到的结果为零
我试图添加和删除setter,将其放入getArea和getPerimeter中的getter / setter方法中,但是似乎没有任何作用
//Code provided by the teacher as a template
Rectangle temp = new Rectangle();
temp.print();
System.out.println();
temp.setLength(2.5);
temp.setWidth(3.0);
//Consider how your rectangle will change after setting the length and width to specific values.
temp.print();
System.out.println();
Rectangle r = new Rectangle(3.5,2);
r.print();
//My Class
public class Rectangle
{
private static double length;
private static double width;
private static double perimeter;
private static double area;
public Rectangle(double length, double width)
{
setLength(length);
setWidth(width);
}
public Rectangle()
{
}
public static double getLength()
{
return length;
}
public static void setLength(double length)
{
Rectangle.length = length;
}
public static double getWidth()
{
return width;
}
public static void setWidth(double width)
{
Rectangle.width = width;
}
public static double getPerimeter(double length, double width)
{
return 2*width+2*length;
}
public static double getArea(double length, double width)
{
area= getLength()*getWidth();
return length*width;
}
public static String print()
{
String Rectangle = new String();
System.out.println("This rectangle has a length of "+length+" and a width of "+width);
System.out.println("The area of the rectangle is: "+ area);
System.out.println("The perimeter of the rectangle is: "+ perimeter);
return Rectangle;
}
}
没有错误消息。
输出:
此矩形的长度为0.0,宽度为0.0矩形的面积是:0.0矩形的周长为:0.0
此矩形的长度为2.5,宽度为3.0矩形的面积是:0.0矩形的周长为:0.0
此矩形的长度为3.5,宽度为2.0矩形的面积是:0.0矩形的周长为:0.0
请不要在var上使用static关键字。因为静态var只能通过静态方法进行操作。如果要使用带有static关键字的var,请将static添加到setter方法。
您需要更改打印方法并调用周长和面积方法,以使这些变量获得所需的值