Int型和byte数组，以及long型和byte数组之间的相互转换

续：几个典型问题的求解 的第一个问题。

直接贴代码：

public class ExchangeIntToByte { static byte[] bArray; public static void intToByte(int a){ bArray = new byte[4]; for(int i=0; i<bArray.length; i++){ bArray[i] = new Integer(a & 0XFF).byteValue(); a >>= 8; System.out.print(bArray[i] +" "); } System.out.println(); } public static void byteToInt(byte[] bArray){ int a = 0; for (int i=0; i<bArray.length; i++){ a += (bArray[i] & 0XFF) << (8 * i); } System.out.println(a); } public static void longToByte(long a){ bArray = new byte[8]; for(int i=0; i<bArray.length; i++){ bArray[i] = new Long(a & 0XFF).byteValue(); a >>= 8; System.out.print(bArray[i] +" "); } System.out.println(); } public static void byteToLong(byte[] bArray){ long a = 0; for (int i=0; i<bArray.length; i++){ a += (long)((bArray[i] & 0XFF) << (8 * i)); } System.out.println(a); } public static void main(String args[]){ int i = 1000; long l = 1000l; intToByte(i); byteToInt(bArray); longToByte(l); byteToLong(bArray); } }

运行结果：

-24 3 0 0 1000 -24 3 0 0 0 0 0 0 1000