e016. determining if two filename paths refer to the same file.txt

这里面包含了一百多个JAVA源文件

A filename path may include redundant names such as `.' or `..' or symbolic links (on UNIX platforms). File.getCanonicalFile() converts a filename path to a unique canonical form suitable for comparisons. 
    File file1 = new File("./filename");
    File file2 = new File("filename");
    
    // Filename paths are not equal
    boolean b = file1.equals(file2);      // false
    
    // Normalize the paths
    try {
        file1 = file1.getCanonicalFile(); // c:\almanac1.4\filename
        file2 = file2.getCanonicalFile(); // c:\almanac1.4\filename
    } catch (IOException e) {
    }
    
    // Filename paths are now equal
    b = file1.equals(file2);              // true