有没有办法让JScience输出更加“人性化”？格式？ [英] Is there a way to make JScience output in a more "human friendly" format?

问题描述

当我使用toString（）获取JScience Amount对象时，我得到如下结果：

When I use toString() for JScience Amount objects I get results like this:

(7.5 ± 4.4E-16) mph

这不是很糟糕，但我真的很想输出类似的东西：

This isn't awful, but I'd really like it to output something like:

7.5 miles per hour

有没有一种简单的方法可以做到这一点？

Is there an easy way to do this?

编辑：为了澄清，我希望有一个解决方案这适用于任何类型单位（或至少所有预定义单位）的任何金额，而不仅仅是mph。

edit: Just to clarify, I'm hoping for a solution that will work for any Amount with any type of Units (or at least all of the pre-defined ones), not just "mph".

推荐答案

虽然它丢弃了错误和单位，但您可以这样做：

Although it discards the errors and units, you can do something like this:

Amount<Velocity> x = Amount.valueOf(7.5, NonSI.MILES_PER_HOUR);
System.out.println(x);
System.out.println(
    x.doubleValue(NonSI.MILES_PER_HOUR) + " miles per hour");

控制台：

(7.5 ± 4.4E-16) mph
7.5 miles per hour

附录：我是希望有适用于任何单位的任何金额的解决方案。

您仍然需要提供自己的标签来替换默认的 UnitFormat ;标签字符受 isValidIdentifier（）的限制。您也可以替换自己的 AmountFormat 。此示例打印估计值的任意数量的有效数字和标签的有效变体。另请参见 TypeFormat 。

You'll still have to provide your own label to replace the default UnitFormat; the label characters are limited by isValidIdentifier(). You can also substitute your own AmountFormat, as suggested by @Roger Lindsjö. This example prints an arbitrary number of significant digits of the estimated value and a valid variation of your label. See also TypeFormat.

final UnitFormat uf = UnitFormat.getInstance();
uf.label(NonSI.MILES_PER_HOUR, "miles_per_hour");
AmountFormat.setInstance(new AmountFormat() {

    @Override
    public Appendable format(Amount<?> m, Appendable a) throws IOException {
        TypeFormat.format(m.getEstimatedValue(), -1, false, false, a);
        a.append(" ");
        return uf.format(m.getUnit(), a);
    }

    @Override
    public Amount<?> parse(CharSequence csq, Cursor c) throws IllegalArgumentException {
        throw new UnsupportedOperationException("Parsing not supported.");
    }
});
Amount<Velocity> x = Amount.valueOf(7.5, NonSI.MILES_PER_HOUR);
System.out.println(x);

控制台：

7.5 miles_per_hour

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