Java Integer Create toInt(byte[] b)

Description

Converts a byte array of 1-4 bytes to an int.

License

Open Source License

Parameter

Parameter	Description
b	the byte array to use

Exception

Parameter	Description
IllegalArgumentException	if the byte array has a length of 0 or greater than 4.

Return

an int having the same value as the byte array. The integer is left paddded with 0s.

Declaration

public static int toInt(byte[] b) 

Method Source Code

//package com.java2s;
/*//from  w w w  . j a  v  a 2 s .  c o m
 * The MIT License
 *
 * Copyright 2013 Georgios Migdos <cyberpython@gmail.com>.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

public class Main {
    /**
     * Converts a byte array of 1-4 bytes to an int.
     * 
     * @param b the byte array to use
     * 
     * @return an int having the same value as the byte array. The integer is 
     * left paddded with 0s.
     * 
     * @throws IllegalArgumentException if the byte array has a length of 0 or 
     *                                  greater than 4.
     */
    public static int toInt(byte[] b) {
        if ((b.length < 1) || (b.length > 4)) {
            throw new IllegalArgumentException("Array of size " + b.length + " cannot be converted to int.");
        }
        int result = 0;
        for (int i = 0; i < b.length; i++) {
            result = ((0xFF & b[i]) << ((b.length - i - 1) * 8)) | result;
        }
        return result;
    }
}

Related

1. toInt(byte[] b)
2. toInt(byte[] b)
3. toInt(byte[] b)
4. toInt(byte[] b)
5. toInt(byte[] b)
6. toInt(byte[] b)
7. toInt(byte[] b)
8. toInt(byte[] b)
9. toInt(byte[] b, int begin_index, int len)