用java编写一个圆类

public class Circle {
private double radius; // 半径

public Circle(double radius) {
this.radius = radius;
}

public double getRadius() {
return radius;
}

public void setRadius(double radius) {
this.radius = radius;
}

// 计算圆的面积
public double getArea() {
return Math.PI * radius * radius;
}

// 计算圆的周长
public double getPerimeter() {
return 2 * Math.PI * radius;
}

// 打印圆的信息
public void printInfo() {
System.out.println("圆的半径：" + radius);
System.out.println("圆的面积：" + getArea());
System.out.println("圆的周长：" + getPerimeter());
}
}