What is BigInteger.longValueExact() method in Java?
In Java, the BigInteger class handles calculations with very big integral values that are beyond the limits of the primitive integer type.
The longValueExact method of the BigInteger class converts the value of the BigInteger to a long value.
An ArithmeticException is thrown if the value of this BigInteger is larger than the maximum value a long type can hold.
Syntax
public long longValueExact()
Parameters
This method doesn’t take any argument.
Output
This method returns the BigInteger value as a long value.
Code
The below code demonstrates how to use the longValueExact method:
import java.math.BigInteger;
class LongValueExact {
public static void main( String args[] ) {
BigInteger val1 = new BigInteger("10");
BigInteger val2 = new BigInteger("9223372036854775808");
System.out.println("LongValueExact of " + val1 + " : "+ val1.longValueExact());
try{
System.out.println("LongValueExact of " + val2 + " : "+ val2.longValueExact());
} catch(Exception e) {
System.out.println("Exception while converting the " + val2 + " - \n" + e);
}
}
}Explanation
In the above code:
-
We created two
BigIntegerobjects,val1andval2, with value10and9223372036854775808, respectively. -
We called the
longValueExactmethod of theval1object. This will return theBigIntegervalue aslong. The value10can be stored inlong, so there will be no exception. -
We called the
longValueExactmethod of theval2object. The value9223372036854775808is too large to be stored inlong, so anArithmeticExceptionis thrown.
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