Java Long Number Create toLong(byte[] bytes)

Description

Converts a byte array to a long value

License

Apache License

Parameter

Parameter	Description
bytes	a parameter

Return

the long value

Declaration

public static long toLong(byte[] bytes) 

Method Source Code

//package com.java2s;
/**//  w  w w  .jav  a 2s  .co  m
 * 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.
 */

public class Main {
    /**
     * Size of long in bytes
     */
    public static final int SIZEOF_LONG = Long.SIZE / Byte.SIZE;

    /**
     * Converts a byte array to a long value
     * @param bytes
     * @return the long value
     */
    public static long toLong(byte[] bytes) {
        return toLong(bytes, 0);
    }

    /**
     * Converts a byte array to a long value
     * @param bytes
     * @param offset
     * @return the long value
     */
    public static long toLong(byte[] bytes, int offset) {
        return toLong(bytes, offset, SIZEOF_LONG);
    }

    /**
     * Converts a byte array to a long value
     * @param bytes
     * @param offset
     * @param length
     * @return the long value
     */
    public static long toLong(byte[] bytes, int offset, final int length) {
        if (bytes == null || length != SIZEOF_LONG || (offset + length > bytes.length)) {
            return -1L;
        }
        long l = 0;
        for (int i = offset; i < (offset + length); i++) {
            l <<= 8;
            l ^= (long) bytes[i] & 0xFF;
        }
        return l;
    }
}

Related

1. toLong(byte[] bytes)
2. toLong(byte[] bytes)
3. toLong(byte[] bytes)
4. toLong(byte[] bytes)
5. toLong(byte[] bytes)
6. toLong(byte[] bytes, boolean bigEndian)
7. toLong(byte[] bytes, int index)
8. toLong(byte[] bytes, int index)
9. toLong(byte[] bytes, int offset)