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public class Circle2D{
private double x;
private double y;
private double radius;
public static final double PI=3.14;
//getter
public double getX(){
return this.x;
}
public double getY(){
return this.y;
}
public double getRadius(){
return this.radius;
}
//constructor
public Circle2D(){
this.x=0;
this.y=0;
this.radius=1;
}
public Circle2D(double x,double y,double radius){
this.x=x;
this.y=y;
this.radius=radius;
}
//Method
public double getArea(){
return PI*radius*radius;
}
public double getPerimeter(){
return 2*PI*radius;
}
private double getDistance(doublex,doubley){
return Math.sqrt((this.x-x)*(this.x-x)+(this.y-y)*(this.y-y));;
}
public boolean contains(double x,double y){
if(getDistance(x,y)<radius)
return true;
return false;
}
public boolean contains(Circle2D circle){
double dis=getDistance(circle.getX(),circle.getY());
if(dis+circle.getRadius()<this.radius)
return true;
return false;
}
public boolean overlaps(Circle2D circle){
dobule dis=getDistance(circle.getX(),circle.getY());
if((dis-circle.getRadius())<this.radius&&(dis+circle.getRadius())>this.radius)
return true;
return false;
}
}