WIFI IP转换

private String intToIp(int i) {
/**
* " -- 表示双引号(")
    * & -- 表示位与运算符(&)
    * &lt; -- 表示小于运算符(<)
    * &gt; -- 表示大于运算符(>)
    * &nbsp; -- 表示空格( )
*/
    return
    ( i & 0xFF) + "." +
    ((i >> 8 ) & 0xFF) + "." +
    ((i >> 16 ) & 0xFF) + "." +
        ((i >> 24 ) & 0xFF)
        ;
    }

由于int是32位，和0xff相与后，高24比特就会被清0。

Integral Types and Values
The values of the integral types are integers in the following ranges:

    * For byte, from -128 to 127, inclusive
    * For short, from -32768 to 32767, inclusive
    * For int, from -2147483648 to 2147483647, inclusive
    * For long, from -9223372036854775808 to 9223372036854775807, inclusive
    * For char, from '\u0000' to '\uffff' inclusive, that is, from 0 to 65535