爲什麼新文件（「c：\\ a」）不等於新文件（「c：\\ a」，「\\」）？

Question

這些彼此相等：

new File("c:\\a") 
new File("c:\\a\\") 
new File("c:\\a","") 
new File("c:\\a\\","") 

但 new File("c:\\a","\\")不等於他們

但 new File("c:\\a","\\b")等於new File("c:\\a","b")

爲什麼呢？

Answer 1

equals() - Compares two abstract pathnames lexicographically。

以下印刷清楚地表明，這有不一樣的路徑。

System.out.println(new File("c:\\a").getAbsolutePath()); 
System.out.println(new File("c:\\a\\").getAbsolutePath()); 
System.out.println(new File("c:\\a","").getAbsolutePath()); 
System.out.println(new File("c:\\a\\","").getAbsolutePath()); 
System.out.println(new File("c:\\a","\\").getAbsolutePath()); 
System.out.println(new File("c:\\a","\\b").getAbsolutePath()); 
System.out.println(new File("c:\\a","b").getAbsolutePath()); 

輸出

c:\a 
c:\a 
c:\a 
c:\a 
c:\a\ 
c:\a\b 
c:\a\b 

Answer 2

我對Java一無所知，但不是因爲「c：\ a」是一個文件，而「\」是一個目錄？

Answer 3

JavaDocs對於java.io.File應該說清楚。

File(File parent, String child) 
      Creates a new File instance from a parent abstract pathname and a child pathname string. 
File(String pathname) 
      Creates a new File instance by converting the given pathname string into an abstract pathname.