Java: Convert from BigInteger to long
Use Number.longValue:
BigInteger bigInt = ...
long l = bigInt.longValue()Note that this simply discards all but the lowest 64 bits. If the BigInteger is outside of the range −9,223,372,036,854,775,808…9,223,372,036,854,775,807 the conversion my have unexpected results.
| BigInteger | longValue() |
|---|---|
| 1,000 | 1,000 |
| 9,223,372,036,854,775,807 | −1 |
| 9,223,372,036,854,775,808 | 0 |
| 9,223,372,036,854,775,809 | 1 |
| 18,446,744,073,709,551,616 | 0 |
| 10,000,000,000,000,000,000 | −1,981,284,352 |
| −10,000,000,000,000,000,000 | 1,981,284,352 |
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