问题描述
我正在编写我的程序的一部分,它从txt文件中读取数据。
I am writing part of my program which read data from a txt file.
当我想通过setValue(object)设置JSpinner的值时,我遇到了问题。
I have problem when I want to set value of JSpinner by setValue(object).
我的数据是双倍所以我需要将它转换为对象,但是如何?
My data is double so I need to convert it to object, but how?
LoadData open = new LoadData();
data.setFz(open.giveAwayData());
spinner_1.setValue(data.getFz()); // Fz is double
推荐答案
使用 Double.valueOf(data.getFz())
。可以在;基本上,原语具有更好的性能,但是当您需要对象
时,盒装类就可用了。一个常见的例子是,它不能是原语。
Use Double.valueOf(data.getFz())
. An explanation of the differences between primitives and boxed primitives can be found here; basically, primitives have better performance but the boxed classes are there for when you need an Object
. A common example is with generics, which cannot be primitives.
但是, double
可以传递给需要 Double $ c $的东西c>或其中一个超类。这是因为。是的,我非常喜欢链接。
However, a double
can be passed to something requiring a Double
or one of its superclasses. This is because of autoboxing. Yes, I like links a lot.
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