Question

我的输出有\。

我的预期输出是：

temp/F1.java
temp/F2.java
temp/subtemp/F3.java

怎么了？............................................ .................................................. .................................................. .................................................. ................

public class FileFinder
{
    public static void main(String[] args) throws IOException
    {
       File dir1 = new File("temp");
       dir1.mkdir() ;
       File f1 = new File("temp/F1.java") ;
       f1.createNewFile() ;
       File f2 = new File("temp/F2.java") ;
       f2.createNewFile() ;
       File dir2 = new File("temp/subtemp") ;
       dir2.mkdir() ;
       File f3 = new File("temp/subtemp/F3.java") ;
       f3.createNewFile() ;
       find(dir1, ".java");
    }

    /**
       Prints all files whose names end in a given extension.
       @param aFile a file or directory
       @param extension a file extension (such as ".java")
    */
    public static void find(File aFile, String extension)
    {            
        //-----------Start below here. To do: approximate lines of code = 10
        // 1. if aFile isDirectory 
        if (aFile.isDirectory()) {
            //2. use listFiles() to get an array of children files 
            File[] children = aFile.listFiles();
            //3. use sort method of Arrays to sort the children 
            Arrays.sort(children);
            //4. for each file in the sorted children 
            for (File child : children) {
                //5. recurse  
                find(child, extension);
            }
        }//
        else {//
            //6. otherwise the file is not a directory, so 
            //use toString() to get the file name 
            String fileName = aFile.toString();
            //7. use replace() to change '\' to '/' 
            fileName.replace('\'' , '/');
            //8. if the file name endsWith the extension 
            if (fileName.endsWith(extension)) {
                //9. then print it.     
                System.out.println(fileName);
            }
        }
        //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.
    }
}

Answer 1

你需要逃避斜线。目前你正在逃避单一报价。

变化：

fileName.replace('\'' , '/');

要：

fileName = fileName.replace('\\' , '/');

replace（）不会改变值，你必须再次保存它，这就是我上面所做的。

Answer 2

此代码

fileName.replace('\'' , '/');

正在将'更改为/并使用使用regexp的replaceAll

你想要的是

fileName.replaceAll("\\" , "/");

但实际上 - 为什么要烦恼这个代码，你甚至都没有保存替换的结果。为此你需要

fileName = fileName.replaceAll("\\" , "/");

Java String replace方法不会将'\'替换为'/'File Finder类

2 个答案: