JAVA圆与圆心代码 java圆点

请教一个JAVA高手，怎么输出一个圆啊，定义好的半径，圆心！急用诶，谢谢，

class Point { //点类

private double x; //私有变量 双精度型 的 x

private double y; //私有变量 双精度型 的 y

Point(double x1, double y1) { //点类的带两个参数的构造方法，

x = x1; //把参数x1的值赋给x

y = y1; //把常识y1的值赋给y

}

public double getX() { return x; }

public double getY() { return y; }

public void setX(double i) { x = i; }

public void setY(double i) { y = i; }

}

class Circle { //圆类

private Point o;

private double radius;

Circle(Point p, double r) {

o = p;

radius = r;

}

Circle(double r) {

o = new Point(0.0, 0.0);

radius = r;

}

boolean contains(Point p) {

double x = p.getX() - o.getX();

double y = p.getY() - o.getY();

if(x*x + y*y radius * radius) return false;

else return true;

}

public void setO(double x, double y) {

o.setX(x);

o.setY(y);

}

public Point getO() { return o; }

public double getRadius() { return radius;}

public void setRadius(double r) { radius = r;}

public double area() {

return 3.14 * radius * radius;

}

}

public class TestCircle { //主类

public static void main(String args[]) {

Circle c1 = new Circle(new Point(1.0,2.0), 2.0);

Circle c2 = new Circle(5.0);

System.out.println("c1:("+c1.getO().getX()+"," +c1.getO().getY()+"),"+c1.getRadius());

System.out.println("c2:("+c2.getO().getX()+","+c2.getO().getY()+"),"+c2.getRadius());

System.out.println("c1 area = "+c1.area());

System.out.println("c1 area = "+c2.area());

c1.setO(5,6);

c2.setRadius(9.0);

System.out.println("c1:("+c1.getO().getX()+","+c1.getO().getY()+"),"+c1.getRadius());

System.out.println("c2:("+c2.getO().getX()+","+c2.getO().getY()+"),"+c2.getRadius());

System.out.println("c1 area = "+c1.area());

System.out.println("c1 area = "+c2.area());

Point p1 = new Point(5.2, 6.3);

System.out.println(c1.contains(p1));

System.out.println(c1.contains(new Point(10.0,9.0)));

}

}

现成的，不过没给你改。自己按自己要求改下。

相关问答

Q1: 急求Java代码，定义一个Circle(圆类型）

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;

}

Q2: 用java求两个圆关系的代码，，求完整的，正确的源代码，谢谢！！

public class Cycle {

private double x = 0;//圆心横坐标

private double y = 0;//圆心纵坐标

private double r = 0;//圆心半径

public static void main(String[] args) {

String relation = "";

Cycle c = new Cycle(0,0,1);

//相交 外切 内切 相离

Cycle c_xiangJiao = new Cycle(3,4,5);

Cycle c_waiQie = new Cycle(3,4,4);

Cycle c_neiQie = new Cycle(3,4,6);

Cycle c_xiangLi = new Cycle(3,4,2);

relation = c.relationWithOtherCycle(c_xiangJiao);

System.out.println("c c_xiangJiao relationShip ："+relation);

relation = c.relationWithOtherCycle(c_xiangLi);

System.out.println("c c_xiangLi relationShip ："+relation);

relation = c.relationWithOtherCycle(c_neiQie);

System.out.println("c c_neiQie relationShip ："+relation);

relation = c.relationWithOtherCycle(c_waiQie);

System.out.println("c c_waiQie relationShip ："+relation);

}

public Cycle(double x, double y, double r) {

this.r = r;

this.x = x;

this.y = y;

}

public Cycle() {

}

public String relationWithOtherCycle(Cycle c){

String relation = ""; //相交 外切 内切 相离

double length = 0;// (x-x1)*(x-x1)+(y-y1)*(y-y1) 开平方

length = Math.sqrt((this.x-c.getX())*(this.x-c.getX())+(this.y-c.getY())*(this.y-c.getY()));

//System.out.println("length : "+length);

if(length(this.r+c.getR())){

relation = "相离";

}else if (length==(this.r+c.getR())){

relation = "外切";

}else if (length==Math.abs(this.r-c.getR())){

relation = "内切";

}else if (lengthMath.abs(this.r+c.getR())lengthMath.abs(this.r-c.getR())){

relation = "相交";

}

return relation;

}

public double getX() {

return x;

}

public void setX(double x) {

this.x = x;

}

public double getY() {

return y;

}

public void setY(double y) {

this.y = y;

}

public double getR() {

return r;

}

public void setR(double r) {

this.r = r;

}

}

//把测试程序写在Cycle的main方法里了

Q3: 用java代码 画圆类

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

class MyCanvas extends Canvas

{

int x,y,r,n;

int x0,y0;

MyCanvas()

{

setSize(圆心位置,圆心位置);

setBackground(Color.red);

}

public void setX(int x)

{

this.x=x;

}

public void setY(int y)

{

this.y=y;

}

public void setR(int r)

{

this.r=r;

}

public void setN(int n)

{

this.n=n;

}

public void paint(Graphics g1)

{

for(int i=0;i=360;i=i+360/n)

{

x0 = (int)(x+r*Math.cos(i));

y0 = (int)(y+r*Math.sin(i));

g1.drawString("*",x0,y0);}

}

}

public class e1 extends Applet implements ActionListener

{

MyCanvas canvas;

TextField inputR,inputX,inputY,inputN;

Label label1,label2,label3;

Button b1,b2;

public void init()

{

canvas = new MyCanvas();

inputR = new TextField(6);

inputX = new TextField(6);

inputY = new TextField(6);

inputN = new TextField(6);

b1 = new Button("确定");

b1.addActionListener(this);

label1 = new Label("输入位置坐标:");

label2 = new Label("输入半径:");

label3 = new Label("输入要打印的*数:");

add(label1);

add(inputX);

add(inputY);

add(label2);

add(inputR);

add(label3);

add(inputN);

add(b1);

add(canvas);

}

public void actionPerformed(ActionEvent e)

{

int x=0,y=0,n=0,r=0;

try

{

x=Integer.valueOf(inputX.getText()).intValue();

y=Integer.valueOf(inputY.getText()).intValue();

n=Integer.valueOf(inputN.getText()).intValue();

r=Integer.valueOf(inputR.getText()).intValue();

canvas.setX(x);

canvas.setY(y);

canvas.setR(r);

canvas.setN(n);

canvas.repaint();

}

catch(NumberFormatException ee)

{

x = 0;

y = 0;

r = 0;

n = 0;

}

}

}

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