江湖救急

[吖阿姨]

拜托各位大佬了

[楓VS痕]

public class Area {
	public static void main(String[] args) {
		Area areas = new Area();
		double radius = 10;
		double area = areas.calculateArea(radius);
		System.out.println(area);
	}

	public double calculateArea(double radius){
		double pai = 3.1415;
		double area = pai * radius * radius;
		
		return area;
	}
}

[等一次另眼相看]

import java.util.Scanner; public class Solution { public static void main(String[] args) { System.out.println("请输入圆的半径："); Scanner scanner = new Scanner(System.in); Double r = scanner.nextDouble(); Double area = caculateCircleAreaByR(r); System.out.println("面积是："+area); } private static Double caculateCircleAreaByR(Double r) { double pi = Math.PI; return pi*r*r; } }