ByteBuffer-将long转换为char数组,反之亦然

您不需要提供索引

long longValZ = 219902744986400000L;

ByteBuffer bbX = ByteBuffer.allocate(8);
bbX.putLong(longValZ); 

char[] charArr1 = new char[4];
for (int i = 0; i < charArr1.length; i++)
   charArr1[i] = bbX.getChar();



//convert char array to long

ByteBuffer bbY = ByteBuffer.allocate(8);
for (int i = 0; i < charArr1.length; i++)
    bbY.putChar(charArr1[i]);

long longValY = bbY.getLong(0); 

多亏了索蒂里奥斯,以下是正确答案:

//convert long to char array

long longValZ = 219902744986400000L;

ByteBuffer bbX = ByteBuffer.allocate(8);
bbX.putLong(longValZ); 

char [] charArr1 = new char[4];
charArr1[0] = bbX.getChar(0);
charArr1[1] = bbX.getChar(2);
charArr1[2] = bbX.getChar(4);
charArr1[3] = bbX.getChar(6);



//convert char array to long

ByteBuffer bbY = ByteBuffer.allocate(8);
bbY.putChar(0,charArr1[0]);
bbY.putChar(2,charArr1[1]);
bbY.putChar(4,charArr1[2]);
bbY.putChar(6,charArr1[3]);

long longValY = bbY.getLong(0);