JAVA定义圆形类。

public class Circle{

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private double r;

public void setR(double r){

this.r=r;

}

public double getArea(){

return Math.PI*r*r;

}

public double getPerimeter(){

return 2*Math.PI*r;

}

}

public class TestCircle{

public static void main(String [] args){

//两个不同对象

Circle circle1 = new Circle();

Circle circle2 = new Circle();

//设置不同半径

circle1.setR(2);

circle2.setR(3);

//显示结果

system.out.println("半径为2的圆面积是"+circle1.getArea()+", 周长是"+circle1.getPerimeter());

system.out.println("半径为3的圆面积是"+circle2.getArea()+", 周长是"+circle2.getPerimeter());

}

}

Java实验，代码怎么写？

Shape.java接口代码

public interface Shape {

public static final double PI = 3.14d;

public double area();

}

Circle.java圆类代码

public class Circle implements Shape {

private double radius;

public Circle(double radius) {

  this.radius = radius;

}

@Override

public double area() {

  return PI * this.radius * this.radius;

}

public double perimeter() {

  return 2 * PI * this.radius;

}

}

Cylinder.java圆柱体类代码

public class Cylinder extends Circle {

private double height;

public Cylinder(double radius, double height) {

  super(radius);

  this.height = height;

}

public double area() {

  return 2 * super.area() + super.perimeter() * this.height;

}

public double volume() {

  return super.area() * this.height;

}

}

X5_3_6.java主类代码

public class X5_3_6 {

public static void main(String[] args) {

  Circle cir1 = new Circle(5);

  System.out.println("圆的面积为：" + cir1.area());

  System.out.println("圆的周长为：" + cir1.perimeter());

  Cylinder cy1 = new Cylinder(10, 15);

  System.out.println("圆柱体的表面积为：" + cy1.area());

  System.out.println("圆柱体的体积为：" + cy1.volume());

}

}

上面是我写的代码，下图是执行结果，麻烦看一下，是否可以。

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;

}

JAVA基础实现圆类Circle

/////写着也够累的....

public class Cylinder extends Circle{

private double h;

public Cylinder(double h, double r, int x, int y) {

super(r, x, y);

this.h = h;

}

public Cylinder(){

}

public double getH() {

return h;

}

public void setH(double h) {

this.h = h;

}

public double area(){

return 2 * super.area() + super.perimeter() * h;

}

public double volume() {

return super.area() * h;

}

public static void main(String[] args) {

Cylinder cy = new Cylinder(4.5, 2.3, 2 , 3);

System.out.println("area: " + cy.area());

System.out.println("volume: " + cy.volume());

}

}

class Circle{

private int x;

private int y;

private double r;

public Circle(){

}

public Circle(double r, int x, int y) {

this.r = r;

this.x = x;

this.y = y;

}

public int getX() {

return x;

}

public void setX(int x) {

this.x = x;

}

public int getY() {

return y;

}

public void setY(int y) {

this.y = y;

}

public double getR() {

return r;

}

public void setR(double r) {

this.r = r;

}

public double perimeter(){

return 2 * Math.PI * r;

}

public double area(){

return Math.PI * r * r;

}

}

用JAVA编写圆

代码如下：

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class TestSw extends JFrame { public static void main(String[] args) { new TestSw(); } public TestSw(){ super("Test"); this.setSize(new Dimension(400,300)); this.setContentPane(new Mypane()); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } class Mypane extends JPanel{ public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); g.setXORMode(Color.white); g.drawArc(20, 20, 100, 100, 0, 360); ///此方法将画一个直径100的圆.红色. } } }

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