blocks|key|539392|text|您必须对每个文件执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|539393|public+static+void+deleteFolder(File+folder)+{
++++File[]+files+=+folder.listFiles();
++++if(files!=null)+{+//some+JVMs+return+null+for+empty+dirs
++++++++for(File+f:+files)+{
++++++++++++if(f.isDirectory())+{
++++++++++++++++deleteFolder(f);
++++++++++++}+else+{
++++++++++++++++f.delete();
++++++++++++}
++++++++}
++++}
++++folder.delete();
}|code-block|syntax|javascript|539394|然后调用|539395|deleteFolder(outputFolder);|539396|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You have to do this for each File:

<pre><code>public static void deleteFolder(File folder) {
 File[] files = folder.listFiles();
 if(files!=null) { //some JVMs return null for empty dirs
 for(File f: files) {
 if(f.isDirectory()) {
 deleteFolder(f);
 } else {
 f.delete();
 }
 }
 }
 folder.delete();
}
</code></pre>

Then call

<pre><code>deleteFolder(outputFolder);
</code></pre>

blocks|key|539440|text|不能在数组上删除！这应该能更好地工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|539441|for+(File+f+:+files)+f.delete();|code-block|syntax|javascript|539442|但是如果文件夹不是空的，它就不会工作。对于这种情况，您需要递归地下降到文件夹层次结构并删除所有内容。是的，很遗憾Java在默认情况下不能做到这一点……|539443|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can't delete on an array ! This should work better :

<pre><code>for (File f : files) f.delete();
</code></pre>

But it won't work if the folders are not empty. For this cases, you will need to recursively descend into the folder hierarchy and delete everything. Yes it's a shame Java can't do that by default...

blocks|key|756033|text|for(File+f+:+files)+{
++++f.delete();
}++++
files.delete();+//+will+work|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|756034|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>for(File f : files) {
 f.delete();
} 
files.delete(); // will work
</code></pre>

blocks|key|756063|text|您不能删除File数组。正如所有其他答案所建议的那样，在删除文件夹之前，您必须删除每个单独的文件...|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|756064|final+File[]+files+=+outputFolder.listFiles();
for+(File+f:+files)+f.delete();
outputFolder.delete();|code-block|syntax|javascript|756065|entityMap^0|5|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can't delete an <code>File</code> array. As all of the other answers suggest, you must delete each individual file before deleting the folder...

<pre><code>final File[] files = outputFolder.listFiles();
for (File f: files) f.delete();
outputFolder.delete();
</code></pre>

blocks|key|756136|text|删除文件夹有文件，不需要循环或递归搜索。您可以直接使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|756137|FileUtils.deleteDirectory(<File+object+of+directory>);|code-block|syntax|javascript|756138|此功能将目录删除文件夹和其中的所有文件。|756139|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

To delete folder having files, no need of loops or recursive search. You can directly use:
<pre><code>FileUtils.deleteDirectory(&lt;File object of directory&gt;);
</code></pre>
This function will directory delete the folder and all files in it.

blocks|key|539600|text|在FileUtils.deleteDirectory()中使用FileUtils；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|539601|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use FileUtils with FileUtils.deleteDirectory();

blocks|key|539647|text|这是一个不需要库就可以解决这个问题的可能的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|539648|public+static+boolean+delete(File+file)+{

++++File[]+flist+=+null;

++++if(file+==+null){
++++++++return+false;
++++}

++++if+(file.isFile())+{
++++++++return+file.delete();
++++}

++++if+(!file.isDirectory())+{
++++++++return+false;
++++}

++++flist+=+file.listFiles();
++++if+(flist+!=+null+&&+flist.length+>+0)+{
++++++++for+(File+f+:+flist)+{
++++++++++++if+(!delete(f))+{
++++++++++++++++return+false;
++++++++++++}
++++++++}
++++}

++++return+file.delete();
}|code-block|syntax|javascript|539649|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is one possible solution to solve the problem without a library :

<pre><code>public static boolean delete(File file) {

 File[] flist = null;

 if(file == null){
 return false;
 }

 if (file.isFile()) {
 return file.delete();
 }

 if (!file.isDirectory()) {
 return false;
 }

 flist = file.listFiles();
 if (flist != null &amp;&amp; flist.length &gt; 0) {
 for (File f : flist) {
 if (!delete(f)) {
 return false;
 }
 }
 }

 return file.delete();
}
</code></pre>

After enumerating a directory, I now need to delete all the files.

I used: 

<pre><code>final File[] files = outputFolder.listFiles();
files.delete();
</code></pre>

But this hasn't deleted the directory.

How to delete directory content in Java?

Java

枚举目录后，我现在需要删除所有文件。我使用：final File[] files = outputFolder.listFiles();files.delete();但这并没有删除目录。

问如何在Java中删除目录内容？
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