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/**
* Returns the value obtained by reversing the order of the bits in the
* two's complement binary representation of the specified <tt>int</tt>
* value.
*
* @return the value obtained by reversing order of the bits in the
* specified <tt>int</tt> value.
* @since 1.5
*/
public static int reverse(int i) {
// HD, Figure 7-1
i = (i & 0x55555555) << 1 | (i >>> 1) & 0x55555555;
i = (i & 0x33333333) << 2 | (i >>> 2) & 0x33333333;
i = (i & 0x0f0f0f0f) << 4 | (i >>> 4) & 0x0f0f0f0f;
i = (i << 24) | ((i & 0xff00) << 8) |
((i >>> 8) & 0xff00) | (i >>> 24);
return i;
}
jdk里面的分治法
01010101
00110011
00001111
这就是 3 5 F
能看明白吗?