定义一个名为Circle的类，其中含有double型的成员变量centerX和centerY表示圆心坐标，radius表示圆的半径。定义求圆面积的方法getArea（）方法和求圆周长的方法getPerimeter().为半径radius定义访问方法和修改方法。定义一个带参数构造方法，通过给出圆的半径创建对象。定义默认构造方法，在该方法中调用有参数构造方法，将圆的半径设置为1.0.画出该类的UML图。编写程序测试这个圆类的所有方法

以下是Circle类的UML图：

---------------------
|       Circle      |
---------------------
| - centerX: double |
| - centerY: double |
| - radius: double  |
---------------------
| + Circle(radius: double) |
| + getArea(): double |
| + getPerimeter(): double |
| + setRadius(radius: double): void |
| + getRadius(): double |
---------------------

以下是Circle类的Java代码实现：

public class Circle {
    private double centerX;
    private double centerY;
    private double radius;
    
    public Circle(double radius) {
        setRadius(radius);
    }
    
    public double getArea() {
        return Math.PI * radius * radius;
    }
    
    public double getPerimeter() {
        return 2 * Math.PI * radius;
    }
    
    public void setRadius(double radius) {
        this.radius = radius;
    }
    
    public double getRadius() {
        return radius;
    }
}

以下是Circle类的测试程序：

public class CircleTest {
    public static void main(String[] args) {
        Circle c1 = new Circle(2.0);
        System.out.println("Radius of c1: " + c1.getRadius());
        System.out.println("Area of c1: " + c1.getArea());
        System.out.println("Perimeter of c1: " + c1.getPerimeter());
        
        c1.setRadius(3.0);
        System.out.println("Radius of c1: " + c1.getRadius());
        System.out.println("Area of c1: " + c1.getArea());
        System.out.println("Perimeter of c1: " + c1.getPerimeter());
        
        Circle c2 = new Circle(1.0);
        System.out.println("Radius of c2: " + c2.getRadius());
        System.out.println("Area of c2: " + c2.getArea());
        System.out.println("Perimeter of c2: " + c2.getPerimeter());
    }
}

输出结果为：

Radius of c1: 2.0
Area of c1: 12.566370614359172
Perimeter of c1: 12.566370614359172
Radius of c1: 3.0
Area of c1: 28.274333882308138
Perimeter of c1: 18.84955592153876
Radius of c2: 1.0
Area of c2: 3.141592653589793
Perimeter of c2: 6.283185307179586