java 定义一个圆类Circle，就解

发布网友发布时间：2023-11-14 12:18

共5个回答

热心网友时间：2024-01-01 07:05

public class Circle {
    //圆的半径
    private double radius;

    //求圆的面积
    public double findArea() {
        return Math.PI*radius*radius;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }
}

测试类自己去写。

热心网友时间：2024-01-01 07:05

//亲手打的望采纳
public class Test {

public static void main(String[] args) {
Circle circle = new Circle();
System.out.println("圆的面积为:"+circle.findArea(5));
}
}
class Circle{
private double radius;
public double findArea(double radius){

return radius*radius*Math.PI;

}
public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
}

热心网友时间：2024-01-01 07:06

import java.util.Scanner;public class Circle {
private float radius;//半径
private double findArea(float r)
{
double s =0;
s = Math.pow(r, 2)*Math.PI;
return s;
}//测试
public static void main(String[] args) {
System.out.println(new Circle().findArea(5));
}
}

热心网友时间：2024-01-01 07:06

class Circle{
    double radius;
    public double findArea(){
        return Math.PI * radius * radius;
    }
}

public class TestArea{
    public static void main(String[] args){
        Circle circle = new Circle();
        double area = 0.0;
        circle.radius = 2;
        area = circle.finaArea();
        System.out.println("面积为：" + area);
    }
}

热心网友时间：2024-01-01 07:07

public class Test {

public static void main(String[] args) {

Circle circle = new Circle();
circle.radius = 5;
System.out.println("圆的面积为：" + circle.findArea());
}

}

class Circle {
double radius;// 半径

public double findArea() {
return radius*radius*3.14;
}
}