Here you can find the source of toBinaryString(byte[] bytes, int bitSize)
public static String toBinaryString(byte[] bytes, int bitSize)
//package com.java2s; /**/* w w w. jav a 2s .com*/ * Copyright 2015 Groupon * * Licensed 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. */ public class Main { public static String toBinaryString(byte[] bytes, int bitSize) { StringBuilder stringBuilder = new StringBuilder(bitSize); for (int i = 0, byteSize = (int) Math.ceil(bitSize / 8.0); i < byteSize; i++) { for (int j = 0; j < 8 && i * 8 + j < bitSize; j++) { stringBuilder.append(bytes[i] >> (7 - j) & 0x1); } } return stringBuilder.toString(); } }