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42 lines (31 loc) · 684 Bytes
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Circle.java
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42 lines (31 loc) · 684 Bytes
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package list;
public class Circle implements Comparable<Circle> {
public double radius;
public Circle(double r) {
if (r < 0)
throw new RuntimeException("Radius cannot be negative");
this.radius = r;
}
public Circle() {
this(1);
}
@Override
public int compareTo(Circle o) {
if (this.radius > o.radius) return 1;
if (this.radius == o.radius) return 0;
return -1;
}
public double getRadius() {
return radius;
}
public double area() {
return Math.PI * this.radius * this.radius;
}
public double perimeter() {
return Math.PI * 2 * this.radius;
}
@Override
public String toString() {
return "This Circle is of radius: " + this.radius;
}
}