Files.move REPLACE_EXISTING 无法解析为变量

Question

Files.move(Path source, Path target, CopyOption... options) 的文档说：

Alternatively, suppose we want to move a file to new directory, keeping the same file name, and replacing any existing file of that name in the directory:
 Path source = ...
 Path newdir = ...
 Files.move(source, newdir.resolve(source.getFileName()), REPLACE_EXISTING);

为什么我在下面的代码中会出错？

 Files.move(Paths.get("outputFilePath"), Paths.get("inputFilePath"), REPLACE_EXISTING);

REPLACE_EXISTING cannot be resolved to a variable

Answer 1

import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
.......

Answer 2

文档说它是接口类型 java.nio.file.CopyOption 的参数，它具有您可能正在寻找的此实现（枚举）：java.nio.file.StandardCopyOption 具有 [=12= 的定义]

Answer 3

你必须写：

StandardCopyOption.REPLACE_EXISTING

或：

import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;

请注意，您也可以尝试 StandardCopyOption.ATOMIC_MOVE 如果可以

Files.move REPLACE_EXISTING 无法解析为变量

Files.move REPLACE_EXISTING cannot be resolved to a variable

java

replace

file

move