Converts a byte array to an int. - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Converts a byte array to an int.

Demo Code

/*******************************************************************************
 * Copyright 2014 Katja Hahn/*from w  w w .  ja v  a2  s  . c o m*/
 * 
 * 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.
 ******************************************************************************/
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] bytes = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(bytesToInt(bytes));
    }

    /**
     * Converts a byte array to an int. The bytes are considered unsigned and
     * little endian (first byte is the least significant).
     * 
     * @param bytes
     *            the little endian byte array that shall be converted to int
     * @return int value
     * @throws IllegalArgumentException
     *             if byte array contains more than 4 bytes
     */
    public static int bytesToInt(byte[] bytes) {
        int value = 0;
        for (int i = 0; i < bytes.length; i++) {
            int shift = 8 * i;
            value += (bytes[i] & 0xFF) << shift;
        }
        return value;
    }
}

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