You may have seen recently that Java suffers from a similar floating-point parsing bug to the one that recently affected PHP users. The basic gist of it is that for this special 64-bit floating point ...

Double的指数部占11位，即可以表示2^11个数（2048个），考虑到补码，范围 应该是-1023~1024或-1024~1023,为啥源码中的范围是-1022~1023， 另外，尾数部为52位，小数点前的1自动补全，所以最大值为1.9999999*2^1023即2^1024,这我能理解， 但为啥取正数最小值时，尾部就变成了2 ...