Fixing Scala error on String.format: overloaded method value format with alternatives:

最新推荐文章于 2020-12-04 11:21:55 发布

原创最新推荐文章于 2020-12-04 11:21:55 发布 · 1.8k 阅读

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博客提到在类型方面需保持一致，要将其统一成Java类型，强调了类型一致性在Java开发中的要求。

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类型上需要一致，统一成java 的。

If you try to use a “Double” in scala, you may get errors passing it to Java:

String.format("%-30s: %.2f ± %0.2f", kv._1, kv._2, kv._3)
This is the error I got:

[error] D:\projects\scala-indexer\src\main\scala\indexer\GpuConcepts.scala:114: overloaded method value format with alternatives:
[error]   (x$1: java.util.Locale,x$2: String,x$3: Object*)String <and>
[error]   (x$1: String,x$2: Object*)String
[error]  cannot be applied to (String, String, Double, Double)
[error]             String.format("%-30s: %.2f ▒ %0.2f", kv._1, kv._2, kv._3)
The issue here is that “Double”, as in “scala.Double” is the equivalent of the primitive “double” in Java. You can fix it by boxing the value:

String.format("%-30s: %.2f ± %0.2f", kv._1, Double.box(kv._2), Double.box(kv._3))