Java 二进制与16进制相互转换

1.二进制转16进制

public class Binary2Hex
{
	public static void main(String[] args)
	{
		String bString = "1010101111001101";
		System.out.println(binaryString2hexString(bString));
	}

	public static String binaryString2hexString(String bString)
	{
		if (bString == null || bString.equals("") || bString.length() % 8 != 0)
			return null;
		StringBuffer tmp = new StringBuffer();
		int iTmp = 0;
		for (int i = 0; i < bString.length(); i += 4)
		{
			iTmp = 0;
			for (int j = 0; j < 4; j++)
			{
				iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);
			}
			tmp.append(Integer.toHexString(iTmp));
		}
		return tmp.toString();
	}
}

2.16进制转二进制

public class Hex2Binary
{
	public static void main(String[] args)
	{
		String hexString = "ABCD";
		System.out.println(hexString2binaryString(hexString));
	}

	public static String hexString2binaryString(String hexString)
	{
		if (hexString == null || hexString.length() % 2 != 0)
			return null;
		String bString = "", tmp;
		for (int i = 0; i < hexString.length(); i++)
		{
			tmp = "0000"
					+ Integer.toBinaryString(Integer.parseInt(hexString
							.substring(i, i + 1), 16));
			bString += tmp.substring(tmp.length() - 4);
		}
		return bString;
	}
}