用java写代码,输入一个圆的半径,调用圆类的方法,显示该圆的面积与周长
时间: 2023-10-31 07:11:21 浏览: 38
下面是用Java编写的圆类及其使用示例:
```java
import java.util.Scanner;
public class Circle {
private double radius;
public Circle(double radius) {
this.radius = radius;
}
public double getRadius() {
return radius;
}
public double getArea() {
return Math.PI * radius * radius;
}
public double getCircumference() {
return 2 * Math.PI * radius;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入圆的半径:");
double radius = scanner.nextDouble();
Circle circle = new Circle(radius);
System.out.printf("圆的面积为:%.2f\n", circle.getArea());
System.out.printf("圆的周长为:%.2f\n", circle.getCircumference());
}
}
```
运行结果示例:
```
请输入圆的半径:5
圆的面积为:78.54
圆的周长为:31.42
```