Java NIO-Files.isSameFile与Path.equals有何不同 [英] Java NIO - How is Files.isSameFile different from Path.equals

问题描述

我不明白java.nio.file.Files.isSameFile方法与java.nio.file.Path.equals方法有何不同.

有人可以告诉他们有什么不同吗?

解决方案

它们非常不同.

例如:

final Path p1 = Paths.get("/usr/src");
final Path p2 = Paths.get("/usr/../usr/src");

p1.equals(p2); // FALSE
Files.isSameFile(p1, p2); // true

final Path p1 = fs1.getPath("/usr/src");
final Path p2 = fs2.getPath("/usr/src");

p1.equals(p2); // FALSE

一个Path等于另一个Path，当且仅当:

• 它们具有相同的FileSystem;
• 它们具有相同的根元素；
• 它们具有相同的名称元素.

这与Files.isSameFile()完全不同，后者访问文件系统并尝试查看两个Path是否指向相同的文件系统资源.

I could not understand how java.nio.file.Files.isSameFile method is different from java.nio.file.Path.equals method.

Could anybody please tell how they are different?

解决方案

They are very different.

For instance:

final Path p1 = Paths.get("/usr/src");
final Path p2 = Paths.get("/usr/../usr/src");

p1.equals(p2); // FALSE
Files.isSameFile(p1, p2); // true

final Path p1 = fs1.getPath("/usr/src");
final Path p2 = fs2.getPath("/usr/src");

p1.equals(p2); // FALSE

A Path is equal to another Path if and only if:

• they have the same FileSystem;
• they have the same root element;
• they have the same name elements.

This is very different from Files.isSameFile() which accesses the filesystem and tries and see if two Paths point to the same filesystem resource.

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