publicclassByteBitPrinter{publicstaticvoidprintBits(byteb){// 打印字节的二进制表示for(inti=7;i>=0;i--){// 通过位移和与运算获取每一位的值intbit=(b>>i)&1;System.out.print(bit);}System.out.println();// 换行}publicstaticvoidmain(String[]args){byteb=5;// 示例字节值System.out.print(...
0 引言 与嵌入式软件数据交互过程中,必然涉及各种的、大量的字节操作场景。如:16进制与10进制、2进制间的转换,字符串、byte数组与int之间的转换等。故此有此核心工具类的沉淀。 1 ByteUtils 依赖 <properties> <!-- 编程提效工具 --> &l
GB2312 对应的 Charset 是 sun.nio.cs.ext. EUC_CN 而对应的 CharsetDecoder 编码类是 sun.nio.cs.ext. DoubleByte,GB2312 字符集有一个 char 到 byte 的码表,不同的字符编码就是查这个码表找到与每个字符的对应的字节,然后拼装成 byte 数组。查表的规则如下: c2b[c2bIndex[char >> 8] + (char & 0x...
A direct byte buffer may be created by invoking the allocateDirect factory method of this class. The buffers returned by this method typically have somewhat higher allocation and deallocation costs than non-direct buffers. The contents of direct buffers may reside outside of the normal garbage-coll...
publicvoidtransferTo(long position,long count,WritableByteChannel target); transferTo()方法将数据从一个channel传输到另一个可写的channel上,其内部实现依赖于操作系统对zero copy技术的支持。在unix操作系统和各种linux的发型版本中,这种功能最终是通过sendfile()系统调用实现。下边就是这个方法的定义: ...
long size =Math.max(1L, (long)cap + (pa ? ps :0));Bits.reserveMemory(size, cap); long base =0;try{ base = unsafe.allocateMemory(size); }catch(OutOfMemoryErrorx) {Bits.unreserveMemory(size, cap);throwx; } unsafe.setMemory(base, size, (byte)0);if(pa && (base % ps !=0)...
byte offsets, they can be used to address up to four billionobjects(not bytes), or a heap size of up to about 32 gigabytes. To use them, they must be scaled by a factor of 8 and added to the Java heap base address to find the object to which they refer. Object sizes using ...
0); i >= 0; i = bitSet.nextSetBit(i + 1)) {System.out.print(i+"\t");}System.out.println("---");}/*** 将BitSet对象转化为ByteArray* @param bitSet* @return*/public static byte[] bitSet2ByteArray(BitSet bitSet) {byte[] bytes = new byte[bitSet.size() / 8];for (int i ...
static int encodeUTF8(char[] utf16, int off, int len, byte[] dest, int dp) { int sl = off + len, last_offset = sl - 1; while (off < sl) { char c = utf16[off++]; if (c < 0x80) { // Have at most seven bits ...
Converts the argument to anintby an unsigned conversion. In an unsigned conversion to anint, the high-order 24 bits of theintare zero and the low-order 8 bits are equal to the bits of thebyteargument. Consequently, zero and positivebytevalues are mapped to a numerically equalintvalue and...