用java創(chuàng)建10個由圓

class Circle {

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public static final double PI = 3.14159; //圓周率

private double radius; //半徑

//構造方法，將半徑置為0

public Circle() {

radius = 0.0;

}

//構造方法，創(chuàng)建Circle對象時將半徑初始化為r

public Circle(double r) {

this.radius = r;

}

//獲得圓的半徑值

public double getRadius(){

return this.radius;

}

//獲得圓的周長

public double getArea() {

return PI * radius * radius;

}

//獲得圓的面積

public double getPerimeter() {

return 2 * PI * radius;

}

// 將圓的半徑、周長、面積輸出到屏幕

public void disp() {

System.out.println("圓的半徑為:"+getRadius()+" 圓的周長為:"+getPerimeter()+" 圓的面積為:"+getArea());

}

}

//測試類

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();

}

}

}

急求Java代碼，定義一個Circle(圓類型）

public class Exam

{

public static void main(String[] args)

{

Circle c=new Circle(3,4,5);

System.out.printf("圓心：(%f,%f)，半徑：%f，面積：%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;

}

求Java三角形圓形代碼過程！急急急?。?！

public class Test {

public static void main(String[] args) {

//三角形

Triangle t = new Triangle(3.0,4.0,5.0);

t.GetArea();

//圓形

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("不能構成三角形");

else {

p = (x + y + z) / 2;

s = (double) Math.sqrt(p * (p - x) * (p - y) * (p - z));

System.out.println("三角形面積為:"+s);

}

}

}

class Circle {

double r ;

public Circle(double r){

this.r = r;

}

public void getArea() {

double S = Math.PI * r * r;

System.out.print("圓形面積為：" + S);

}

}

我建的是類部類，你移出去一樣的。希望能幫到你！