Java Byte Array to Int bytesToInt(byte[] bytes)

Description

Converts a byte array to an int.

License

Apache License

Parameter

Parameter	Description
bytes	the little endian byte array that shall be converted to int

Return

int value

Declaration

public static int bytesToInt(byte[] bytes) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2014 Katja Hahn/*w  w w. ja  v  a  2s .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.
 ******************************************************************************/

public class Main {
    /**
     * Converts a byte array to an int. The bytes are considered unsigned and
     * little endian (first byte is the least significant).
     * <p>
     * Presumes the array bytes to be not null and its length smaller than or
     * equal to 4
     * 
     * @param bytes
     *            the little endian byte array that shall be converted to int
     * @return int value
     */
    public static int bytesToInt(byte[] bytes) {
        assert bytes != null && bytes.length <= 4;
        final int BYTE_SIZE = 8;
        int value = 0;
        for (int i = 0; i < bytes.length; i++) {
            // shift byte i times, so it gets the correct significance
            int shift = BYTE_SIZE * i;
            // (b & 0xff) treats b as unsigned byte
            // calculate the value to add by performing the shift
            value += (bytes[i] & 0xff) << shift;
        }
        return value;
    }
}

Related

1. bytesToInt(byte[] buf, int startIdx)
2. bytesToInt(byte[] buff, int off, int len)
3. bytesToInt(byte[] bytes)
4. bytesToInt(byte[] bytes)
5. bytesToInt(byte[] bytes)
6. bytesToInt(byte[] bytes)
7. bytesToInt(byte[] bytes)
8. bytesToInt(byte[] bytes)
9. bytesToInt(byte[] bytes, int bitOffset, int bitCount)