The first kind:
1, the conversion between int and byte[] (similar to byte? Short and long types)
【java】？ Opinion? Plain? Copy?
/**?
*? Converts an int value into a four-byte byte array. This method is suitable for sequence (low order first, high order last). ? Used with bytesToInt ()?
*? @param？ Value?
* int value to be converted?
*? @ Return? Byte array?
*/
Public? Static electricity byte[]？ intToBytes(？ int？ Value? )
{
byte[]？ src？ =? New? Byte [4]; ?
src[3]？ =? (bytes)? ((value & gt& gt24)? & amp？ 0x ff)； ?
src[2]？ =? (bytes)? ((value & gt& gt 16)? & amp？ 0x ff)； ?
src[ 1]？ =? (bytes)? ((value & gt& gt8)? & amp？ 0x ff)；
src[0]？ =? (bytes)? (value? & amp？ 0x ff)； ?
Return? src
}?
/**?
*? Converts an int value into a four-byte byte array. This method is suitable for sequence (high order first, low order later). ? Used with bytesToInt2 ()?
*/
Public? Static electricity byte[]？ intToBytes2(int？ Value)
{
byte[]？ src？ =? New? Byte [4]; ?
src[0]？ =? (bytes)? ((value & gt& gt24)? & amp？ 0x ff)； ?
src[ 1]？ =? (bytes)? ((value & gt>16); ? 0x ff)； ?
src[2]？ =? (bytes)? ((value & gt>8)&; 0x ff)；
src[3]？ =? (bytes)? (value? & amp？ 0x ff)；
Return? src？
}?
Byte[] to int
【java】？ Opinion? Plain? Copy?
/**?
*? Accepts int values in byte arrays. This method is suitable for the order (low order comes first, high order comes last). Can I use it with intToBytes ()?
*
*? @param？ src？
* byte array?
*? @param？ Offset?
* Starting from the first offset bit of the array?
*? @ Return? Int value?
*/
Public? Static electricity int？ bytesToInt(byte[]？ src，？ int？ Offset)? {?
int？ Value;
Value? =? (int)？ ((src[offset]？ & amp？ 0xFF)
|? ((src[offset+ 1]？ & amp？ 0x ff)& lt； & lt8)
|? ((src[offset+2]？ & amp？ 0x ff)& lt； & lt 16)
|? ((src[offset+3]？ & amp？ 0x ff)& lt； & lt24)); ?
Return? Value; ?
}?
/**?
*? Int values are taken from byte arrays, and the appropriate order of this method is (low order last, high order first). Used with intToBytes2 ()?
*/?
Public? Static electricity int？ bytesToInt2(byte[]？ src，？ int？ Offset)? {?
int？ Value;
Value? =? (int)？ (? ((src[offset]？ & amp？ 0x ff)& lt； & lt24)?
|((src[offset+ 1]？ & amp？ 0x ff)& lt； & lt 16)?
|((src[offset+2]？ & amp？ 0x ff)& lt； & lt8)?
|(src[offset+3]？ & amp？ 0x ff))； ?
Return? Value; ?
}?
The second type: 1, int and byte[] (similar to byte
Short and long types)
【java】？ Opinion? Plain? Copy?
/**?
*? Converts an int value into a four-byte byte array. This method is suitable for sequence (low order first, high order last). ?
*? @param？ Value?
* int value to be converted?
*? @ Return? Byte array?
*/
Public? Static electricity byte[]？ intToBytes(int？ Value)
{
byte[]？ byte_src？ =? New? Byte [4]; ?
byte_src[3]？ =? (bytes)? ((value? & amp？ 0xFF000000)>& gt24); ?
byte_src[2]？ =? (bytes)? ((value? & amp？ 0x00FF0000)>& gt 16); ?
byte_src[ 1]？ =? (bytes)? ((value? & amp？ 0x0000FF00)>& gt8);
byte_src[0]？ =? (bytes)? ((value? & amp？ 0x 000000 ff))； ?
Return? byte _ src？
}?
Byte[] to int
【java】？ Opinion? Plain? Copy?
/**?
*? Int values are taken from byte arrays, and the suitable order of this method is (low order first, high order last). ?
*
*? @param？ ary？
* byte array?
*? @param？ Offset?
* Starting from the first offset bit of the array?
*? @ Return? Int value?
*/
Public? Static electricity int？ bytesToInt(byte[]？ ary？ int？ Offset)? {?
int？ Value;
Value? =? (int)？ ((ary[offset]& amp； 0xFF)
|? ((ary[offset+ 1]& lt； & lt8)? & amp？ 0xFF00)？
|? ((ary[offset+2]& lt； & lt 16)； ? 0xFF0000)
|? ((ary[offset+3]& lt； & lt24)? & amp？ 0x ff 000000))； ?
Return? Value; ?
}