Reads a int using big-endian convention. - Java java.lang

Java examples for java.lang:int Binary

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Description

Reads a int using big-endian convention.

Demo Code

/*/*from w w w.  j  ava 2  s.  c o m*/
 * Copyright (c) 2008 Kasper Nielsen.
 *
 * 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(readInt(bytes));
    }

    /**
     * Reads a int using big-endian convention.
     * 
     * @param bytes
     *            the array to read from
     * @return the integer corresponding to the 4 bytes that was read
     */
    public static int readInt(byte[] bytes) {
        return readInt(bytes, 0);
    }

    /**
     * Reads a int using big-endian convention from the specified offset.
     * 
     * @param bytes
     *            The array to read from
     * @param offset
     *            the position to start reading from
     * @return the integer corresponding to the 4 bytes that was read
     */
    public static int readInt(byte[] bytes, int offset) {
        return (bytes[offset] << 24) + ((bytes[offset + 1] & 0xff) << 16)
                + ((bytes[offset + 2] & 0xff) << 8)
                + (bytes[offset + 3] & 0xff);
    }
}

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