public class L1106 {
public static void main(String[] args) {
// TODO Auto-generated method stub
TestDemo circle1 =
new TestDemo();
double area=
circle1.getArea();
System.out.println(area);
TestDemo circle2=
new TestDemo(
10);
System.out.println(circle2.getArea());
System.out.println(circle1.getPerimeter());
System.out.println(circle2.getPerimeter());
double ridius=
10;
double areaCircle=Math.PI*ridius*
ridius;
System.out.println(areaCircle);
circle2.setRadius(5);
System.out.println(circle2.getArea());
}
}
public class TestDemo {
private double radius;
public TestDemo(
double radius) {
this.radius =
radius;
}
public TestDemo() {
this.radius =
1.0;
}
public double getArea() {
return Math.PI * radius *
radius;
}
public double getPerimeter() {
return 2 * Math.PI *
radius;
}
public void setRadius(
double newRadius) {
this.radius =
newRadius;
}
}
转载于:https://www.cnblogs.com/speater/p/8057206.html
