?? testcircle.java
字號:
class Circle{
private double radius;
public void setRadius(double r) {
radius = r;
}
public double getArea() {
return Math.PI * radius * radius;
}
public double getPerimenter() {
return 2 * Math.PI * radius;
}
public double getRadius() {
return radius;
}
}
public class TestCircle {
public static void main(String[] args) {
Circle r1 = new Circle();
r1.setRadius(3);
System.out.println("Radius = " + r1.getRadius());
System.out.println("Area = " + r1.getArea());
System.out.println("Perimenter = " + r1.getPerimenter());
}
}
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