Java - 将双精度数转换为浮点数
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Java - convert double to float
提问by 0ne_Up
I've seen an example where the following code is used to convert a double to a float:
我看过一个示例，其中使用以下代码将双精度数转换为浮点数：
Double.valueOf(someDouble).floatValue()
I would just do it like
我会这样做
(float)someDouble
Is there any advantage to using the former?
使用前者有什么好处吗？
回答by Eran
Looking at the implementation of Double's floatValue():
查看Double's的实现floatValue()：
/**
* Returns the value of this {@code Double} as a {@code float}
* after a narrowing primitive conversion.
*
* @return the {@code double} value represented by this object
* converted to type {@code float}
* @jls 5.1.3 Narrowing Primitive Conversions
* @since JDK1.0
*/
public float floatValue() {
return (float)value;
}
It looks like it behaves exactly like your casting. Therefore there's no advantage to using it.
看起来它的行为与您的铸造完全一样。因此，使用它没有任何好处。
