java compilation

julia
java compilation
1 Answer(s)      7 years ago
Posted in : UML
Every circle has a center and a radiuus. Given the radius , we can determine the circles area and circumference. Given the center, we can determine its position in the x-y plane. The center of a circle is a point in the x-y plane. Design the class circle that can store the radius and the center of the circle. Because the center is a point in the x-y plane and you designed the class to capture the properties of a point in programming exercise 3, you must derive the class circle from the class point. you should be able to perform the usual operations on a circle, such as setting the radius, printing the radius , calculating and printing the area and circumference, and carrying out the usual operations on the center.

April 30, 2010 at 2:55 PM

Hi Friend,

Try the following code:

class Point{
private double x;
private double y;

public Point(){}

public Point(double x, double y){
this.x=x;
this.y=y;
}

public void setX(double x){
this.x=x;
}

public void setY(double y){
this.y=y;
}

public double getX(){
return x;
}

public double getY(){
return y;
}

public void showCoordinate(){
System.out.println("(X,Y)="+"("+x+","+y+")");
}
}
public class Circle extends Point{

private double r;

public Circle(){}

public Circle(double x, double y, double r){
super(x,y);
this.r=r;
}

public void setR(double r){
this.r=r;
}

public double getR(){
return r;
}

public double area(){
return Math.PI*r*r;
}

public double circumference(){
return 2*Math.PI*r;
}

public static void main(String args[]){
Circle c = new Circle(12,3,5);
System.out.println(c.getX());
System.out.println(c.getY());
System.out.println(c.getR());
c.setX(100);
c.setY(120);
c.setR(4);
System.out.println(c.getX());
System.out.println(c.getY());
System.out.println(c.getR());
c.showCoordinate();
System.out.println(c.area());
System.out.println(c.circumference());
}
}

Thanks

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