定义一个描述平面坐标系统中点及其操作的类Point.(Java)定义一个描述平面坐标系统中的点及其操

定义一个描述平面坐标系统中点及其操作的类Point.(Java)定义一个描述平面坐标系统中的点及其操

public class Point { private double x; private double y; public Point(double x, double y){ this.x = x; this.y = y; } public double getX() { return x; } public double getY() { return y; } public void shiftPoint(double w, double h){ x += w; y += y; } public boolean pointEquals(Point point){ if(point.x == x && point.y == y) return true; return false; } public void whatQuadrant(){ int a = 1; if( x 0) a = 2; else if(x a = 3; else if(x > 0 && y a = 4; if( x == 0 && y == 0 ) System.out.println(点(+x+,+y+)在原点); else if(x == 0 && y !=0 ) System.out.println(点(+x+,+y+)在Y轴); else if( y == 0 && x != 0 ) System.out.println(点(+x+,+y+)在X轴); else System.out.println(点(+x+,+y+)在第+a+象限); } public double findDistance(Point p){ BigDecimal b = new BigDecimal(Double.toString(Math.sqrt(Math.pow(x - p.x, 2) + Math.pow(y - p.y, 2)))); return b.setScale(2, BigDecimal.ROUND_CEILING).doubleValue(); } public String toString(){ return (+x+,+y+); } public static void main(String [] args){ Point p =new Point(3,2); System.out.println(x=+p.getX()+y=+p.getY()); p.pointEquals(new Point(3,2)); p.shiftPoint(5,6); System.out.println(x=+p.getX()+y=+p.getY()); p.whatQuadrant(); System.out.println(p.findDistance(new Point(0,0))); System.out.println(p.toString()); }}

就是这个解释