java對數據的位操作

以後搞JAVA了，發一些入門級沒營養的東西。
數據位操作函數

         /**整數轉成byte數組*/
	 public static byte[] intToByteArray(int i) {   
	        byte[] result = new byte[4];   
	        result[0] = (byte) ((i >> 24) & 0xFF);   
	        result[1] = (byte) ((i >> 16) & 0xFF);   
	        result[2] = (byte) ((i >> 8) & 0xFF);   
	        result[3] = (byte) (i & 0xFF);   
	        return result;   
	    }

	 /**短整型轉到byte數組*/
	 public static byte[] shortToByteArray(short s) 
	 {
		   byte[] shortBuf = new byte[2];
		   for(int i=0;i<=0;i++) {
		   int offset = (shortBuf.length - 1 -i)*8;
		   shortBuf[i] = (byte)((s>>>offset)&0xff);
		   }
		   return shortBuf;
	 }

	 /**byte轉short,同時高低位互換*/
	 public static final int byteArrayToShort(byte [] b) {
		    return (b[1] << 8) + (b[0] & 0xFF);
		   }

	 /**byte轉int,同時高低位互換*/
	 public static final int byteArrayToInt(byte [] b) {
		    return (b[3] << 24) + (b[2] << 16) + (b[1] << 8) + (b[0] & 0xFF);
		   }

	 /**整數轉byte, 同時，高低位互換*/
	 public static byte[] intLtoH(int n){ 
	        byte[] b = new byte[4]; 
	        b[0] = (byte)(n & 0xff); 
	        b[1] = (byte)(n >> 8 & 0xff); 
	        b[2] = (byte)(n >> 16 & 0xff); 
	        b[3] = (byte)(n >> 24 & 0xff); 
	        return   b; 
	    } 

	/**將短整型高低位互換*/
	 public static byte[] shortLtoH(int n){ 
	        byte[] b = new byte[4]; 
	        b[0] = (byte)(n & 0xff); 
	        b[1] = (byte)(n >> 8 & 0xff); 
	        return   b; 
	    } 

	 /**單字節轉無符號整數*/
	 public  static int bytesToInt(byte b) 
	 {
		return ((int)b >= 0) ? (int)b : 256 + (int)b;  
	 }

	 /**
	  * 取得某一個data的第pos位的二進制位是0還是1
	  * @param data 要查的數據
	  * @param pos 第幾位
	  * @return 0或1
	  */
	 public static int getBin(int data,int pos)
	{
		pos-=1;
		if(pos < 0)
			return 0;
		if(((1<<pos) & data )== 0)
			return 0;
		else
			return 1;
	}