public class Circular{

//圓心x

private double centerx;

//圓心y

private double centery;

//半徑

private double radius;

private double PI =3.14;

//set get 方法

public void setCenterx(double centerx){

this.centerx = centerx;

}

public double getCenterx(){

return centerx;

}

public void setCentery(double centery){

this.centery = centery;

}

public double getCentery(){

return centery;

}

public void setRadius(double radius){

this.radius = radius;

}

public double getRadius(){

return radius;

}

//計算面積

public double getArea(){

return PI*radius*radius;

}

//計算周長

public double getRound(){

return 2*PI*radius;

}

//是否相交

public boolean isTouch(double otherx,double othery,double otherRadius){

double x = this.centerx-otherx;

double y = this.centery-othery;

double s = Math.pow(x,2)+Math.pow(y,2);

//兩個圓心距離

double d = Math.pow(s,0.5);

//兩個圓半徑之和

double sumR = radius + otherRadius;

return sumR >= d?true:false;

}

}