Bytes to float int String Double

package com.helo.datReader;import java.nio.charset.Charset;public class ByteUtil  {      public static byte[] getBytes(short data)      {          byte[] bytes = new byte[2];          bytes[0] = (byte) (data & 0xff);          bytes[1] = (byte) ((data & 0xff00) >> 8);          return bytes;      }      public static byte[] getBytes(char data)      {          byte[] bytes = new byte[2];          bytes[0] = (byte) (data);          bytes[1] = (byte) (data >> 8);          return bytes;      }      public static byte[] getBytes(int data)      {          byte[] bytes = new byte[4];          bytes[0] = (byte) (data & 0xff);          bytes[1] = (byte) ((data & 0xff00) >> 8);          bytes[2] = (byte) ((data & 0xff0000) >> 16);          bytes[3] = (byte) ((data & 0xff000000) >> 24);          return bytes;      }      public static byte[] getBytes(long data)      {          byte[] bytes = new byte[8];          bytes[0] = (byte) (data & 0xff);          bytes[1] = (byte) ((data >> 8) & 0xff);          bytes[2] = (byte) ((data >> 16) & 0xff);          bytes[3] = (byte) ((data >> 24) & 0xff);          bytes[4] = (byte) ((data >> 32) & 0xff);          bytes[5] = (byte) ((data >> 40) & 0xff);          bytes[6] = (byte) ((data >> 48) & 0xff);          bytes[7] = (byte) ((data >> 56) & 0xff);          return bytes;      }      public static byte[] getBytes(float data)      {          int intBits = Float.floatToIntBits(data);          return getBytes(intBits);      }      public static byte[] getBytes(double data)      {          long intBits = Double.doubleToLongBits(data);          return getBytes(intBits);      }      public static byte[] getBytes(String data, String charsetName)      {          Charset charset = Charset.forName(charsetName);          return data.getBytes(charset);      }      public static byte[] getBytes(String data)      {          return getBytes(data, "GBK");      }      public static short getShort(byte[] bytes)      {          return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));      }      public static char getChar(byte[] bytes)      {          return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));      }      public static int getInt(byte[] bytes)      {          return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 & (bytes[2] << 16)) | (0xff000000 & (bytes[3] << 24));      }      public static long getLong(byte[] bytes)      {          return(0xffL & (long)bytes[0]) | (0xff00L & ((long)bytes[1] << 8)) | (0xff0000L & ((long)bytes[2] << 16)) | (0xff000000L & ((long)bytes[3] << 24))           | (0xff00000000L & ((long)bytes[4] << 32)) | (0xff0000000000L & ((long)bytes[5] << 40)) | (0xff000000000000L & ((long)bytes[6] << 48)) | (0xff00000000000000L & ((long)bytes[7] << 56));      }      public static float getFloat(byte[] bytes)      {          return Float.intBitsToFloat(getInt(bytes));      }      public static double getDouble(byte[] bytes)      {          long l = getLong(bytes);          System.out.println(l);          return Double.longBitsToDouble(l);      }      public static String getString(byte[] bytes, String charsetName)      {          return new String(bytes, Charset.forName(charsetName));      }      public static String getString(byte[] bytes)      {          return getString(bytes, "GBK");      }      public static void main(String[] args)      {          short s = 122;          int i = 122;          long l = 1222222;          char c = 'a';          float f = 122.22f;          double d = 122.22;          String string = "我是好孩子";          System.out.println(s);          System.out.println(i);          System.out.println(l);          System.out.println(c);          System.out.println(f);          System.out.println(d);          System.out.println(string);          System.out.println("**************");          System.out.println(getShort(getBytes(s)));          System.out.println(getInt(getBytes(i)));          System.out.println(getLong(getBytes(l)));          System.out.println(getChar(getBytes(c)));          System.out.println(getFloat(getBytes(f)));          System.out.println(getDouble(getBytes(d)));          System.out.println(getString(getBytes(string)));      }  }