Here you can find the source of delete(File file)
public static boolean delete(File file)
//package com.java2s; import java.io.File; public class Main { public static boolean delete(File file) { if (file == null) return false; return file.delete(); }//from ww w . j ava2 s. com public static boolean delete(String path) { if (path == null) return false; File file = new File(path); return file.delete(); } }