com.buession.core.utils.NumberUtils Maven / Gradle / Ivy
/*
* 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.
*
* =========================================================================================================
*
* This software consists of voluntary contributions made by many individuals on behalf of the
* Apache Software Foundation. For more information on the Apache Software Foundation, please see
* .
*
* +-------------------------------------------------------------------------------------------------------+
* | License: http://www.apache.org/licenses/LICENSE-2.0.txt |
* | Author: Yong.Teng |
* | Copyright @ 2013-2020 Buession.com Inc. |
* +-------------------------------------------------------------------------------------------------------+
*/
package com.buession.core.utils;
/**
* 数字工具类
*
* @author Yong.Teng
*/
public class NumberUtils {
/**
* 将 int 转换为 byte[]
*
* @param value
* int 类型的值
*
* @return byte[] 值
*/
public final static byte[] int2bytes(final int value){
byte[] result = new byte[4];
for(int i = 0; i < 4; ++i){
int offset = 32 - (i + 1) * 8;
result[i] = (byte) ((value >> offset) & 0xff);
}
return result;
}
/**
* 将 byte[] 转换为 int
*
* @param value
* byte[] 类型的值
*
* @return int 值
*/
public final static int bytes2int(final byte[] value){
int result = 0;
for(int i = 0; i < 4; ++i){
result <<= 8;
result |= (value[i] & 0xff);
}
return result;
}
/**
* 将 long 转换为 byte[]
*
* @param value
* long 类型的值
*
* @return byte[] 值
*/
public final static byte[] long2bytes(final long value){
byte[] result = new byte[8];
for(int i = 0; i < 8; ++i){
int offset = 64 - (i + 1) * 8;
result[i] = (byte) ((value >> offset) & 0xff);
}
return result;
}
/**
* 将 byte[] 转换为 long
*
* @param value
* byte[] 类型的值
*
* @return long 值
*/
public final static long bytes2long(final byte[] value){
long result = 0;
for(int i = 0; i < 8; ++i){
result <<= 8;
result |= (value[i] & 0xff);
}
return result;
}
/**
* 将 float 转换为 byte[]
*
* @param value
* float 类型的值
*
* @return byte[] 值
*/
public final static byte[] float2bytes(final float value){
return int2bytes(Float.floatToIntBits(value));
}
/**
* 将 byte[] 转换为 float
*
* @param value
* byte[] 类型的值
*
* @return float 值
*/
public final static double bytes2float(final byte[] value){
return (float) bytes2int(value);
}
/**
* 将 double 转换为 byte[]
*
* @param value
* double 类型的值
*
* @return byte[] 值
*/
public final static byte[] double2bytes(final double value){
return long2bytes(Double.doubleToLongBits(value));
}
/**
* 将 byte[] 转换为 double
*
* @param value
* byte[] 类型的值
*
* @return double 值
*/
public final static double bytes2double(final byte[] value){
return (double) bytes2long(value);
}
}