Here you can find the source of writeBytes(File file, byte[] pattern, int repeat)
public static void writeBytes(File file, byte[] pattern, int repeat) throws IOException
//package com.java2s; /*/* w ww .ja v a 2 s .com*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; public class Main { public static void writeBytes(File file, byte[] pattern, int repeat) throws IOException { file.deleteOnExit(); file.getParentFile().mkdirs(); OutputStream out = null; try { out = new BufferedOutputStream(new FileOutputStream(file)); for (int i = 0; i < repeat; i++) { out.write(pattern); } out.close(); out = null; } finally { try { if (out != null) { out.close(); } } catch (final IOException e) { // Suppressed due to an exception already thrown in the try block. } } } public static boolean mkdirs(File directory) { if (directory == null) { return false; } if (directory.exists()) { return false; } if (directory.mkdir()) { return true; } File canonDir = null; try { canonDir = directory.getCanonicalFile(); } catch (IOException e) { return false; } File parentDir = canonDir.getParentFile(); return (parentDir != null && (mkdirs(parentDir) || parentDir.exists()) && canonDir.mkdir()); } }