# Java.math.BigInteger.longValue() Method

## Description

The java.math.BigInteger.longValue() converts this BigInteger to a long. This conversion is analogous to a narrowing primitive conversion from long to int.

If this BigInteger is too big to fit in a long, only the low-order 64 bits are returned. This conversion can lose information about the overall magnitude of the BigInteger value as well as return a result with the opposite sign.

## Declaration

Following is the declaration for java.math.BigInteger.longValue() method.

```public long longValue()
```

## Specified by

longValue in class Number.

NA

## Return Value

This method returns this BigInteger converted to a long.

NA

## Example

The following example shows the usage of math.BigInteger.longValue() method.

```package com.tutorialspoint;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

// create 2 BigInteger objects
BigInteger bi1, bi2;

// create 2 Long objects
Long l1, l2;

// assign values to bi1, bi2
bi1 = new BigInteger("-123");
bi2 = new BigInteger("9888486986");

// assign the long values of bi1, bi2 to l1, l2
l1 = bi1.longValue();
l2 = bi2.longValue();

String str1 = "Long value of " +bi1+ " is " +l1;
String str2 = "Long value of " +bi2+ " is " +l2;

// print l1, l2 values
System.out.println( str1 );
System.out.println( str2 );
}
}
```

Let us compile and run the above program, this will produce the following result −

```Long value of -123 is -123
Long value of 9888486986 is 9888486986
```
java_math_biginteger.htm