Java中byte數(shù)組與long數(shù)組相互轉(zhuǎn)化
ByteAndLongArrayTest代碼如下：
- package com.array.test;
- import java.io.IOException;
- public class ByteAndLongArrayTest {
-
- public static byte[] longToByte(long[] longArray)throws IOException{
- byte[] byteArray=new byte[longArray.length*8];
- for(int i=0;i<longArray.length;i++)
- {
- byteArray[0+8*i]=(byte)(longArray[i]>>56);
- byteArray[1+8*i]=(byte)(longArray[i]>>48);
- byteArray[2+8*i]=(byte)(longArray[i]>>40);
- byteArray[3+8*i]=(byte)(longArray[i]>>32);
- byteArray[4+8*i]=(byte)(longArray[i]>>24);
- byteArray[5+8*i]=(byte)(longArray[i]>>16);
- byteArray[6+8*i]=(byte)(longArray[i]>>8);
- byteArray[7+8*i]=(byte)(longArray[i]>>0);
- }
- return byteArray;
- }
-
-
- public static long[] byteToLong(byte[] byteArray)throws IOException{
-
- long [] longArray=new long[byteArray.length/8];
- for(int i=0;i<longArray.length;i++)
- {
- longArray[i]=(((long)byteArray[0+8*i]&0xff)<<56)
- |(((long)byteArray[1+8*i]&0xff)<<48)
- |(((long)byteArray[2+8*i]&0xff)<<40)
- |(((long)byteArray[3+8*i]&0xff)<<32)
- |(((long)byteArray[4+8*i]&0xff)<<24)
- |(((long)byteArray[5+8*i]&0xff)<<16)
- |(((long)byteArray[6+8*i]&0xff)<<8)
- |(((long)byteArray[7+8*i]&0xff)<<0);
-
- }
- return longArray;
- }
-
- public static void main(String[] args) throws Exception{
-
- long [] longArray={1,2,3,4,500000};
- byte [] byteArray=longToByte(longArray);
- for(int i=0;i<byteArray.length;i++)
- {
- System.out.print(byteArray[i]+" ");
- }
- System.out.println();
- long [] longArray2=byteToLong(byteArray);
- for(int i=0;i<longArray.length;i++)
- System.out.print(longArray[i]+" ");
- }
- }
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