class Circle {
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public static final double PI = 3.14159; //圆周率
private double radius; //半径
//构造方法，将半径置为0
public Circle() {
radius = 0.0;
}
//构造方法，创建Circle对象时将半径初始化为r
public Circle(double r) {
this.radius = r;
}
//获得圆的半径值
public double getRadius(){
return this.radius;
}
//获得圆的周长
public double getArea() {
return PI * radius * radius;
}
//获得圆的面积
public double getPerimeter() {
return 2 * PI * radius;
}
// 将圆的半径、周长、面积输出到屏幕
public void disp() {
System.out.println("圆的半径为:"+getRadius()+" 圆的周长为:"+getPerimeter()+" 圆的面积为:"+getArea());
}
}
//测试类
class testCircle {
public static void main(String args[]) {
Circle[] circleArray = new Circle[10];
for (int i = 0; i circleArray.length; i++) {
circleArray[i] = new Circle(Math.random()*100);
}
for (Circle circle : circleArray) {
circle.disp();
}
}
}
public class Exam
{
public static void main(String[] args)
{
Circle c=new Circle(3,4,5);
System.out.printf("圆心：(%f,%f)，半径：%f，面积：%f",c.x,c.y,c.r,c.countArea());
}
}
class Circle
{
public Circle()
{
this(0,0,0);
}
public Circle(double x,double y,double r)
{
this.x=x;
this.y=y;
this.r=r;
}
public double countArea()
{
return Math.PI*r*r;
}
/*private*/public double x,y,r;
}
public class Test {
public static void main(String[] args) {
//三角形
Triangle t = new Triangle(3.0,4.0,5.0);
t.GetArea();
//圆形
Circle c = new Circle(5.0);
c.getArea();
}
}
class Triangle {
double x, y, z, p, s;
public Triangle(double x, double y, double z) {
this.x = x;
this.y = y;
this.z = z;
}
public void GetArea() {
if (x + y = z || x + z = y || y + z = x)
System.out.println("不能构成三角形");
else {
p = (x + y + z) / 2;
s = (double) Math.sqrt(p * (p - x) * (p - y) * (p - z));
System.out.println("三角形面积为:"+s);
}
}
}
class Circle {
double r ;
public Circle(double r){
this.r = r;
}
public void getArea() {
double S = Math.PI * r * r;
System.out.print("圆形面积为：" + S);
}
}
我建的是类部类，你移出去一样的。希望能帮到你！
