Here you can find the source of delete(File file)
private static void delete(File file)
//package com.java2s; //License from project: Open Source License import java.io.File; public class Main { private static void delete(File file) { if (file.isDirectory()) { File[] files = file.listFiles(); for (File file2 : files) delete(file2);/*from w ww .ja va2s . co m*/ } if (!file.delete()) throw new RuntimeException("Failed to delete file: " + file); } }