File.isFile()返回不正确的结果? [英] File.isFile() returns incorrect result?

问题描述

public class Test {
  public static void isFile() {
    System.out.println(new File("D:\\a.log").isFile());
  }

  public static void main(String[] args) {
    System.out.println(new File("‪D:\\a.log").isFile());
    isFile();
  }
}

预期结果是:

true
true

但实际上结果是:

false
true

文件D:\ a.log实际上存在并且路径正确，jdk版本是1.8.0_11，操作系统是win10

The file D:\a.log is actually exist and the path is correct, the jdk version is 1.8.0_11, and the os is win10

如何理解这一点?

推荐答案

main方法中的字符串"‪D:\\a.log"具有9个字符，isFile方法中的字符串具有8个字符.

The string "‪D:\\a.log" inside the main method has 9 characters, the one in the isFile method has 8 characters.

main方法中的一个以不可见的Unicode字符U + 202A(从左向右嵌入")开头.

The one inside the main method starts with invisible unicode character U+202A ("LEFT-TO-RIGHT EMBEDDING").

将main中的字符串替换为isFile中的字符串，或从main中的字符串中删除第一个不可见的字符.

Replace the string inside main with the string inside isFile, or delete the first invisible character from the string in main.

(注意:这表明复制粘贴您的实际代码的真正好处，因为问题出在您上面的问题中粘贴的代码中)

(Note: this shows the real benefit of copy-pasting your actual code, as the problem is in the code that you pasted in your question above)

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