Here you can find the source of toByteArray(int integer)
public static byte[] toByteArray(int integer)
//package com.java2s; /***************************************************************** * 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./*from w w w. j ava 2s .c o m*/ ****************************************************************/ import java.nio.ByteBuffer; public class Main { public static byte[] toByteArray(int integer) { if (integer <= Short.MAX_VALUE) { return toByteArray((short) integer); } return ByteBuffer.allocate(4).putInt(integer).array(); } public static byte[] toByteArray(short shortInt) { if (shortInt <= Byte.MAX_VALUE) { return toByteArray((byte) shortInt); } return ByteBuffer.allocate(2).putShort(shortInt).array(); } public static byte[] toByteArray(byte byteInt) { return new byte[] { byteInt }; } }