Java_洪泽海_1105_homework-优快云博客

本文介绍了使用Java实现的Point（点）、Rectangle（矩形）和Circle（圆）三个类的设计与具体实现细节。Point类定义了二维空间中的点；Rectangle类通过一个Point对象和宽度高度来表示矩形；Circle类同样利用Point对象来定义圆心位置，并包含计算圆的面积、判断点是否在圆内等方法。

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package november_05th;

public class Point {
private double x;
private double y;

public Point(){}
public Point(double x,double y){
   this.x = x;
   this.y = y;
}
public double getX() {
   return x;
}
public void setX(double x) {
   this.x = x;
}
public double getY() {
   return y;
}
public void setY(double y) {
   this.y = y;
}
public void display(){
   System.out.println("The point is at:("+this.x+","+this.y+")");

}
}

package november_05th;

public class Rectangle {
private Point point;
private double width;
private double height;

public Rectangle(){}
public Rectangle(Point p,double width,double height){
   this.point = p;
   this.width = width;
   this.height = height;
}
public Rectangle(double x,double y,double width,double height){
   this.point.setX(x);
   this.point.setY(y);
   this.width = width;
   this.height = height;
}
public Rectangle(Rectangle r){

}
public void setPoint(double x,double y){
   this.point.setX(x);
   this.point.setY(y);
}
public double getArea(){
   return this.width*this.height;
}
public void display(){
   System.out.println("The rectangle's width and height is :"+this.width+","+this.height);
}
public Point getPoint() {
   return point;
}
public void setPoint(Point point) {
   this.point = point;
}
public double getWidth() {
   return width;
}
public void setWidth(double width) {
   this.width = width;
}
public double getHeight() {
   return height;
}
public void setHeight(double height) {
   this.height = height;
}

}

package november_05th;

public class Circle {
private Point p;
private double radius;

public Circle(){}
public Circle(Point p,double r){
   this.p = p;
   this.radius = r;
}
public Circle(double x,double y,double r){
   this.p.setX(x);
   this.p.setY(y);
   this.radius = r;
}
public Circle(Circle c){

}
public void setPoint(double x,double y){
   this.p.setX(x);
   this.p.setY(y);
}
public boolean isInside(Point p){
   double distance = (((p.getX()-this.getP().getX())*(p.getX()-this.getP().getX()))+((p.getY()-this.getP().getY())*(p.getY()-this.getP().getY())));
   if(distance<this.radius){
       return true;
   }
   else{
       return false;
   }
}//判断点是否在圆内部
public Circle outerRect(Rectangle r){
   double radius_x = r.getPoint().getX()+r.getWidth()/2;
   double radius_y = r.getPoint().getY()+r.getHeight()/2;
   double radius = Math.sqrt(((r.getPoint().getX()-radius_x)*(r.getPoint().getX()-radius_x))+(r.getPoint().getY()-radius_y)*(r.getPoint().getY()-radius_y));
   return new Circle(radius_x,radius_y,radius);
}//返回一个矩形的外接圆
public Circle join(Circle c1, Circle c2) {
   double distance = Math.sqrt(((c1.getP().getX()-c2.getP().getX())*(c1.getP().getX()-c2.getP().getX()))+((c1.getP().getY()-c2.getP().getY())*(c1.getP().getY()-c2.getP().getY())));
   double r_ = Math.abs(c1.getRadius()-c2.getRadius());
   if(distance>r_){
       double radius = (distance+c1.getRadius()+c2.getRadius())/2;
       double x = (c1.getP().getX() + c2.getP().getX())/2;
       double y = (c1.getP().getY() + c2.getP().getY())/2;
       return new Circle(x,y,radius);
   }
   else{
       return new Circle();
   }
}//返回两个参数圆的最小外接圆
public double distance(Circle c1, Circle c2) {
   return Math.sqrt(((c1.getP().getX()-c2.getP().getX())*(c1.getP().getX()-c2.getP().getX()))+((c1.getP().getY()-c2.getP().getY())*(c1.getP().getY()-c2.getP().getY())));
}//返回两个参数圆圆心之间的距离
public String toString(){
   return "(圆心x坐标值，圆心y坐标值，圆半径) :"+"("+this.getP().getX()+","+this.getP().getY()+","+this.getRadius()+")";
}
//返回本圆的基本信息，格式为（圆心x坐标值，圆心y坐标值，圆半径）。如：（0, 0, 2）
public void test(){
   System.out.println("succeed xiaojijia");
}
public Point getP() {
   return p;
}
public void setP(Point p) {
   this.p = p;
}
public double getRadius() {
   return radius;
}
public void setRadius(double radius) {
   this.radius = radius;
}