ducaale
Posts: 4
Nickname: guure03
Registered: Sep, 2002
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Re: new student
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Posted: Sep 20, 2002 6:31 AM
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here is my question:
Write a class called Circle which has two constructors. One takes three doubles in its constructor corresponding to the X and Y coordinates and the radius. The other default constructor supplies default values for the coordinates and radius. Please round computer results to 2 decimal places when displaying results. The class must include these methods:
public double circumference() ? returning the circumference
public double area() ? returning the area
public void setRadius(double r) ? is called in the constructor and checks the radius against a maximum. If the radius is greater than the maximum, setRadius resets it to the maximum (using the ternary conditional operator)
public void printAttributes() ? prints the coordinates, the radius, the circumference and the area.
public boolean isInside(int x, int y) ? tests whether or not a point falls inside the circle
boundingBox(); ? prints the coordinates for the box that contains the circle
move(x, y) ? moves the origin by a specified amount .
here is my work: I need to double check what I did is Ok since3 I am new student for java.
public class Circlex {
public double x, y, r;
public double MAX;
public double circumference (double x, double y, double r) {
this.x= x;
this.y= y;
this.r= r;
return this.r *3.14 * this.r;
}
public double area() {
return 3.14*r*r;
}
public void setRadius (double r) {
double MAXR;
MAXR = 100.0 ;
if ( this. r > MAXR )
this. r= MAXR;
}
public void printAttributes() {
System.out.println(" r+ circumference + area");
}
// is (x,y) inside the circle?
public boolean isInside( int x, int y) {
double distance;
distance = Math.sqrt(x * x + y * y);
if (distance < r)
return true;
else
return false;
}
void boundBox() {
System.out.println(" Circle");
}
void move ( double x, double y) {
this.x = x;
this.y = y;
}
public static void main(String[] args) {
}
}
Plase let me know.
Thanks
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