You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
22 lines
498 B
22 lines
498 B
public class Circle extends Shape{
|
|
private double radius;
|
|
public Circle(double radius){
|
|
if (radius <= 0){
|
|
throw new IllegalArgumentException("半径必须大于0");
|
|
}
|
|
this.radius = radius;
|
|
}
|
|
@Override
|
|
public double getArea() {
|
|
return Math.PI * radius * radius;
|
|
}
|
|
|
|
@Override
|
|
public String getShapeName() {
|
|
return "圆形";
|
|
}
|
|
|
|
public double getRadius() {
|
|
return radius;
|
|
}
|
|
}
|
|
|