泛型

class Point<T> {

    private T x;
    private T y;

    public T getX() {
        return x;
    }

    public void setX(T x) {
        this.x = x;
    }

    public T getY() {
        return y;
    }

    public void setY(T y) {
        this.y = y;
    }
}

public class GenericDemo {
    public static void main(String args[]) {
        Point<Float> p = new Point<Float>();
        p.setX(100.1f);
        p.setY(325.3f);
        System.out.println(p.getX() + "  " + p.getY());
    }
}