com.fjn.helper.common.util.NumberUtil.java Source code

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Here is the source code for com.fjn.helper.common.util.NumberUtil.java

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/*
 *
 *  Copyright 2018 FJN Corp.
 *
 *  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.
 *
 *  Author                        Date                       Issue
 *  fs1194361820@163.com          2015-01-01                 Initial Version
 *
 */

package com.fjn.helper.common.util;

import org.apache.commons.lang3.math.NumberUtils;

/**
 *
 * @author fjn
 *
 */
public class NumberUtil extends NumberUtils {

    /**
     * intbyte[]
     *
     * @param number
     * @return
     */
    public static byte[] int2bytes(int number) {
        byte[] targets = new byte[4];
        targets[0] = (byte) (number & 0xff);// ?
        targets[1] = (byte) ((number >> 8) & 0xff);// ?
        targets[2] = (byte) ((number >> 16) & 0xff);// ?
        targets[3] = (byte) (number >>> 24);// ?,??
        return targets;
    }

    /**
     * byte[]int
     *
     * @param bytes
     * @return
     */
    public static int bytes2int(byte[] bytes) {
        int targets = (bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00) | ((bytes[2] << 24) >>> 8) | (bytes[3] << 24);
        return targets;
    }

    public static void main(String[] args) {
        byte[] b = int2bytes(128);
        int a = bytes2int(b);
        System.out.println(a);
    }
}