使用Java删除所有带扩展名的文件 [英] Delete all files with an extension using Java

问题描述

我（相对）是Java的新手，我正在尝试实现一个运行命令列表的.jar，它在Windows XP的命令提示符下会是：

I'm (relatively) new to Java and I'm trying to implement a .jar that runs a list of commands that in Windows XP's command prompt it would be:

cd\
cd myfolder
del *.lck /s

我的（失败）尝试：

// Lists all files in folder
File folder = new File(dir);
File fList[] = folder.listFiles();
// Searchs .lck
for (int i = 0; i < fList.length; i++) {
    String pes = fList.get(i);
    if (pes.contains(".lck") == true) {
        // and deletes
        boolean success = (new File(fList.get(i)).delete());
    }
}

我在get（i）附近搞砸了，但我认为我现在非常接近我的目标。

I screwed somewhere around that "get(i)", but I think I'm pretty close to my goal now.

我请求你的帮助，并提前非常感谢你！

I ask for your help and thank you very much in advance!

编辑

好吧！非常感谢大家。通过3个建议的修改，我最终得到：

Alright! Many thanks, everybody. With the 3 suggested modifications I ended up with:

// Lists all files in folder
File folder = new File(dir);
File fList[] = folder.listFiles();
// Searchs .lck
for (int i = 0; i < fList.length; i++) {
    String pes = fList[i];
    if (pes.endsWith(".lck")) {
        // and deletes
        boolean success = (new File(fList[i]).delete());
    }
}

现在可行了！

推荐答案

fList.get（i）应为 fList [i] as fList 是一个数组，它返回文件引用而不是字符串。

fList.get(i) should be fList[i] as fList is an array, and it returns a File reference not a String.

更改： -

String pes = fList.get(i);

to： -

File pes = fList[i];

然后更改 if（pes.contains（。lck）=如果（pes.getName（）。contains（。lck））

事实上，既然你要检查扩展名，你应该使用 endsWith 方法而不是包含方法。是的，您不需要将布尔值与 == 进行比较。所以只需使用这个条件： -

In fact, since you are checking for the extension, you should use endsWith method rather than contains method. And yes, you don't need to compare your boolean value with ==. So just use this condition: -

if (pes.getName().endsWith(".lck")) {
    boolean success = (new File(fList.get(i)).delete());
}

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