Java Point，getX（）和point.x之间的区别 [英] Java Point, difference between getX() and point.x

问题描述

我很困惑为什么Java Point类接受两个int参数并且getX（）和getY（）方法返回双精度。
例如我可以定义一个点

I am confused to as why the Java Point class takes in two int paramaters and the getX() and getY() methods return doubles. For example I could define a Point

Point p = new Point(4,6);

如果我打电话..

p.getX();

它将返回4.0。如果我打电话

It would return 4.0. and if I were to call

p.x;

我会得到4。

任何原因是什么？

推荐答案

Point2D.Double 和 Point2D.Float 扩展 Point2D 的类，它是 Point 的超类并且他们需要能够使用浮点值。请注意，还有 setLocation（double，double）。

There are Point2D.Double and Point2D.Float classes that extend Point2D which is a superclass of Point and they need to be able to work with floating point values. Note that there is also a setLocation( double, double ).

Point2D 是一个抽象类，用于实现点的距离计算， setLocation ， getX 和 getY 是它的抽象方法，这就是为什么它们都使用双打以及为什么 Point 必须在签名中使用 double 来实现它们。

Point2D is an abstract class that implements the distance calculation for points, and setLocation, getX, and getY are its abstract methods, which is why they all use doubles and why Point has to implement them with doubles in the signature.

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