실린더 클래스 계산 표시 0.0

Question

public class Turner_A03Q1 { public static class 실린더 { double radius; 이중 높이; double area = (2 * Math.PI * radius * height) + (2 * Math.PI * Math.pow (radius, 2)); 이중 체적 = 높이 * Math.PI * 반경 * 반경; 공개 실린더 (이중 반경, 이중 높이) { this.radius = radius; this.height = height; } public double getRadius() { 반경 반경; } public void setRadius (double r) { radius = r; } 공개 double getHeight() { return height; } public void setHeight (double h) { height = h; } public double getArea() { 반품 영역] } public double getVolume() { return volume; } public String toString() { return ("실린더 영역은"+ 영역 + "이고 볼륨은"+ 볼륨 + "입니다."); } } public static void main (String [] args) { 실린더 실린더 1 = 새 실린더 (5.5, 7.8);

 System.out.println(cylinder1); 
    cylinder1.setRadius(2.4); 
    System.out.println(cylinder1); 
    cylinder1.setHeight(10.9); 
    System.out.println(cylinder1); 
    } 

} 

Answer 1

죄송 모두 확실하지가 그

public class Turner_A03Q1 
{ 
public static class Cylinder 
    { 
double radius; 
double height; 
double area = (2 * Math.PI * radius * height) + (2 * Math.PI * Math.pow(radius, 2)); 
double volume = height * Math.PI * radius * radius; 
public Cylinder(double radius, double height) 
{ 
    this.radius = radius; 
    this.height = height; 
} 
public double getRadius() 
{ 
    return radius; 
    } 
public void setRadius(double r) 
{ 
    radius = r; 
    } 
    public double getHeight() 
    { 
     return height; 
} 
public void setHeight(double h) 
{ 
    height = h; 
} 
public double getArea() 
{ 
    return area; 
    } 
public double getVolume() 
{ 
    return volume; 
    } 
public String toString() 
{ 
    return ("Cylinder Area is " + area + " and the volume is " + volume + "."); 
} 
} 
public static void main (String [] args) 
{ 
    Cylinder cylinder1 = new Cylinder(5.5, 7.8); 

    System.out.println(cylinder1); 
    cylinder1.setRadius(2.4); 
    System.out.println(cylinder1); 
    cylinder1.setHeight(10.9); 
    System.out.println(cylinder1); 
    } 

처럼 내 코드}