java test circle_TestCircle.java

import java.util.Scanner;

public class TestCircle {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc = new Scanner(System.in);

/*Circle c1 = new Circle();

System.out.print("第一个圆已经生成, 它的半径是:");

System.out.println(c1.getRadius() + "cm");

System.out.print("它的面积是:");

System.out.printf("%.2f平方厘米\n", c1.getArea());

System.out.print("它的颜色是默认的");

System.out.println(c1.getColor());

System.out.print("\n输入第二个圆的半径和颜色: ");

Circle c2 = new Circle(sc.nextDouble(), sc.nextLine());

System.out.print("第二个圆已经生成, 它的半径是:");

System.out.println(c2.getRadius() + "cm");

System.out.print("它的面积是:");

System.out.printf("%.2f平方厘米\n", c2.getArea());

System.out.print("它的颜色是");

System.out.println(c2.getColor());

System.out.print("\n修改第二个圆的颜色为: ");

c2.setColor(sc.nextLine());

System.out.print("修改后它的颜色是");

System.out.println(c2.getColor());

*/

System.out.print("\n输入第三个圆的半径: ");

Circle c3 = new Circle(sc.nextDouble());

System.out.println(c3.toString());

sc.close();

}

}

class Circle {

private double radius;

private String color;

public Circle() {

radius = 1;

color = "红色";

}

public Circle(double radius) {

this.radius = radius;

this.color = "白色";

}

public Circle(double radius, String color) {

this.radius = radius;

this.color = color;

}

public double getRadius() {

return radius;

}

public void setRadius(double radius) {

this.radius = radius;

}

public String getColor() {

return color;

}

public void setColor(String color) {

this.color = color;

}

public String toString(){

StringBuffer sb = new StringBuffer();

sb.append("Circle: [ radius=");

sb.append(this.radius);

sb.append(", color=");

sb.append(this.color);

sb.append(" ]");

return sb.toString();

}

public double getArea() {

return Math.PI * this.radius * this.radius;

}

}

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