Convert unsigned int to long in Java

Use Integer.toUnsignedLong to avoid sign extension.

int i = 0b10000011001000010101011000000000;  // -2094967296 or 2200000000

long signed = i;                             // -2094967296 (with sign extension)
long unsigned = Integer.toUnsignedLong(i);   //  2200000000 (without sign extension)

Or, equivalently:

long unsigned = i & 0xffffffffL;