CircleTest_java_设计一个circle_点类_圆类_

package CircleTest; import java.util.Scanner; import java.math.BigDecimal; import java.text.DecimalFormat; class Point{ private int x; private int y; public Point() { x = 0; y = 0; } public Point(int x) { this.x = x; this.y = x; } public Point(int x,int y){ this.x = x; this.y = y; } public int getX() { return x; } public int getY() { return y; } public String toString() { return "("+x+","+y+")"; } } class Circle{ private int x; private int y; private Point o = new Point(x,y); private double r; private static final double pi=3.1415926535; public Circle(Point o,double r) { this.o = o; this.r = r; this.x = o.getX(); this.y = o.getY(); } public Point getO() { return o; } public double getR() { return r; } public double getArea(){ return pi*r*r; } public boolean compare(double d1,double d2) { BigDecimal val1=new BigDecimal(d1); BigDecimal val2=new BigDecimal(d2); if(val1.compareTo(val2) < 0||val1.compareTo(val2) == 0) { return true;} else { return false;} } public boolean contains(Point p) { double x = Math.abs(p.getX() - this.x); double y = Math.abs(p.getY() - this.y); double d1 = x*x+y*y; double d2 = r*r; return compare(d1,d2); } public boolean contains(int x,int y) { double dx = Math.abs(x - this.x); double dy = Math.abs(y - this.y); double d1 = dx*dx+dy*dy; double d2 = r*r; return compare(d1,d2); } public String toString() { return "("+"("+x+","+y+")"+","+r+")"; } } public class CircleTest { public static void main(String[] args) { // TODO Auto-generated method stub Scanner san = new Scanner(System.in); int x = san.nextInt(); int y = san.nextInt(); double r = san.nextDouble(); int t = san.nextInt(); Circle circle= new Circle(new Point(x,y),r); Point p = new Point(t); System.out.println(String.format("Area of Circle"+circle.toString()+" is:"+"%.2f",circle.getArea())); if(circle.contains(p)) { System.out.println("Point"+p.toString()+" is in the Circle"+circle.toString()); } else { System.out.println("Point"+p.toString()+" is not in the Circle"+circle.toString()); } }}