java生成circle对象,并调用draw方法

java生成circle对象,并调用draw方法：class Circle{double x,y,rpublic Circle(){this.x=0this.y=0this.r=0}。

使用静态方法创建对象public static Circle createInstance(){createCount++return new Circle()}使用静态变量保存创建次数private static int createCountpublic int getCreateCount(){return createCount}。

语言规范：

JCP维护的规范包括Java ME、Java SE、Java EE、XML、OSS、JAIN等。组织成员可以提交JSR（Java Specification Requests），通过特定程序以后，进入到下一版本的规范里面。

JSR是早期提议和最终发布的Java平台规范的具体描述。通常，一个新的JSR的提出是为了增加或者规范Java平台的功能。某个具体的JSR由专家组共同来制定，工作由组长协调。

例如，CLDC1.0（Connected Limited Device Configuration，JSR30）由Sun公司的Antero Taivalsaari担任组长，同时专家组的成员还包括Siemens、Motorola、Nokia、Symbian等。Java ME平台规范是在JSR68中定义的，规范组长是Sun公司的Jon Courtney。

按照题目要求编写的圆,圆锥和测试类的Java程序如下

Test.java文件内容如下

class Circle{

private double r

private String color

public Circle(double r){

this.r=r

}

public double area(){

return Math.PI*r*r

}

public double perimeter(){

return Math.PI*2*r

}

public double getR(){

return this.r

}

public void setR(double r){

this.r=r

}

public String getColor(){

return this.color

}

public void setColor(String color){

this.color=color

}

public String toString(){

return "圆的半径为"+r+",颜色为"+color

}

}

class Cone{

private Circle c

private double h

private String color

public Cone(Circle c,double h){

this.c=c

this.h=h

}

public double volume(){

return 1.0/3*c.area()*h

}

public Circle getCircle(){

return this.c

}

public void setCircle(Circle c){

this.c=c

}

public double getH(){

return this.h

}

public void setH(double h){

this.h=h

}

public String getColor(){

return this.color

}

public void setColor(String color){

this.color=color

}

public String toString(){

return "圆锥的底面积为"+c.area()+",高为"+h+",颜色为"+color

}

}

public class Test{

public static void main(String[] args){

Circle circle1=new Circle(2.5)

circle1.setColor("红色")

System.out.println(circle1.toString())

System.out.println("圆的面积为"+circle1.area())

System.out.println("圆的周长为"+circle1.perimeter())

Cone circlar1=new Cone(circle1,2.7)

circlar1.setColor("蓝色")

System.out.println(circlar1.toString())

System.out.println("圆锥的体积为"+circlar1.volume())

}

}

import java.awt.Point

public class Circle{

private Point centerPoint

private int r

public Circle(){}

public Circle(Point p,int r){

this.r=r

this.centerPoint=p

}

public int getR(){return this.r}

public void setR(int r){this.r=r}

public Point getCenPoint(){return this.centerPoint}

public void setcenterPoint(Point p){this.centerPoint=p}

public boolean isInside(Point point){

double ar=Math.sqrt((point.x-centerPoint.x)*(point.x-centerPoint.x)+(point.y-centerPoint.y)*(point.y-centerPoint.y))

if(ar>=this.r){

return false

}else{

return true

}

}

}

public class test{

public static void main(){

Circle aCircle=new Circle(new Point(0,0),10)

Point p1=new Point(5,5)

Point p2=new Point(15,0)

if(aCircle.isInside(p1)){

System.out.println("p1在圆的内部")

}else{

System.out.println("p1不在圆的内部")

}

Point p2=new Point(15,0)

if(aCircle.isInside(p2)){

System.out.println("p2在圆的内部")

}else{

System.out.println("p2不在圆的内部")

}

}

}

如果你愿意，自己可以把圆的参数都改成float,或者double。这事是简单的一个例子

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