public class d
{
int aaa = 3;
public static void main(String args[])
{
Cylinder obj = new Cylinder();
obj.area();
}
private class Cylinder
{
double radius;
int height;
double pi=3.14;
void area()
{
System.out.println("圆柱体面积="+(pi*radius*radius) * aaa);
}
void volume()
{
System.out.println("圆柱体体积="+(((pi*radius*radius))*height));
}
}
}
{
int aaa = 3;
public static void main(String args[])
{
Cylinder obj = new Cylinder();
obj.area();
}
private class Cylinder
{
double radius;
int height;
double pi=3.14;
void area()
{
System.out.println("圆柱体面积="+(pi*radius*radius) * aaa);
}
void volume()
{
System.out.println("圆柱体体积="+(((pi*radius*radius))*height));
}
}
}
{
int aaa = 3;
public static void main(String args[])
{
Cylinder obj = new Cylinder();
obj.area();
}
} class Cylinder {
double radius;
int height;
double pi = 3.14; void area() {
double aaa = 0; //你没有定义aaa 需要自己定义并给所需要的值
System.out.println("圆柱体面积=" + (pi * radius * radius) * aaa);
} void volume() {
System.out.println("圆柱体体积=" + (((pi * radius * radius)) * height));
}
}
{
int aaa = 3;
public static void main(String args[])
{
Cylinder obj = new Cylinder();
obj.area(aaa);
}
public class Cylinder
{
double radius;
int height;
double pi=3.14;
void area(int aaa)
{
System.out.println("圆柱体面积="+(pi*radius*radius) * aaa);
}
void volume()
{
System.out.println("圆柱体体积="+(((pi*radius*radius))*height));
}
}
}
public class Test
{
public static void main(String args[])
{
Cylinder obj = new Cylinder();
obj.area(10.0,5);
}
}
class Cylinder
{
double pi=3.14;
void area(double radius,int height)
{
//不过你的圆柱体表面积计算公式好像有问题吧,应该是(2π*R*R+2π*R*H)
System.out.println("圆柱体面积="+(pi*radius*radius) );
}
void volume(double radius,int height)
{
System.out.println("圆柱体体积="+(((pi*radius*radius))*height));
}
} class Cylinder前不加private
首先,LZ的代码中private class Cylinder只是个内部类,所以那些搞成了2个类的贴出来的代码我就不说啥了~
其次,就拿2楼的代码说下,那个内部类你Cylinder obj = new Cylinder(); 这样都能new出来?
在LZ的代码里加了一点东西,应该可以满足LZ的要求了,问题就在这里创建内部类实例上,其实大家都知道,咋就都不好好看看捏?public class d {
int aaa = 3; public static void main(String args[]) {
Cylinder obj = new d().new Cylinder();
obj.area(); } private class Cylinder {
Cylinder() { }
//这里把radius 和height 给你赋了2个初值,要不你下面(pi * radius * radius) * aaa)这里计算就
//肯定为0了,int和double 默认初值为零
double radius = 1; int height = 1; double pi = 3.14; void area() {
System.out.println("圆柱体面积=" + (pi * radius * radius) * aaa);
} void volume() {
System.out.println("圆柱体体积=" + (((pi * radius * radius)) * height));
}
}
}
Cylinder obj = new d().new Cylinder();