public class Body extends Point{
    public double x,y,mass;

    public Body() {
        x = y = mass = 0;
    }

    public Body(double x,double y,double mass) {
        this.mass = mass;
        this.x = x;
        this.y = y;
    }
}

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

    public Point(double x,double y) {
        this.x = x;
        this.y = y;
    }
}

我很快意识到,这样做会在Body类中创建两个变量,称为x,另外两个变量在Body中称为y.这甚至是甚么可能的,为什么Java甚至可以让它呢？

我假设这是Body的正确代码：

public class Body extends Point{
    public double mass;

    public Body() {
        super();
        mass = 0;
    }

    public Body(double x,double mass) {
        super(x,y);
        this.mass = mass;
    }
}

谢谢你的时间