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Showing content from https://www.geeksforgeeks.org/java/biginteger-intvalueexact-method-in-java-with-examples/ below:

BigInteger intValueExact() Method in Java with Examples

Last Updated : 04 Dec, 2018

java.math.BigInteger.intValueExact()

was introduced in Java 8. It is an inbuilt function which converts the value of BigInteger to a int and checks for lost information. If the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; the method will throw

ArithmeticException

as BigInteger doesn’t fit in int range.

Syntax:

public int intValueExact()

Return Value:

This method returns the int value of this BigInteger.

Exception:

The method throws

ArithmeticException

if the value of BigInteger is greater than 2,147,483,647 or less than -2,147,483,648; as this range doesn’t fit in int range.

Example:

Input: 4561561
Output: 4561561
Explanation: 4561561 is given as input which is bigInteger
and int value of 4561561 is 4561561

Input: -8546512
Output: -8546512
Explanation: -8546512 is given as input which is bigInteger 
and int value of -8546512 is -8546512

Input: 3000000000
Output: ArithmeticException
Explanation: When 3000000000 is tried to convert to int,
since 3000000000 > 2,147,483,647 (greater than a int's range), 
therefore it throws an arithmetic exception.

Below programs illustrates intValueExact() method of BigInteger class:

Program 1:

To demonstrate intValueExact() method for positive number <2,147,483,647

Java


 // Java program to demonstrate intValueExact()
// method of BigInteger Class

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {
        // Creating a BigInteger object
        BigInteger big;
        big = new BigInteger("4561561");

        // print value of BigInteger
        System.out.println("BigInteger value : "
                           + big);

        // convert big to the int value
        int b1 = big.intValueExact();

        // print int value
        System.out.println("int converted value : "
                           + b1);
    }
}

Output:

BigInteger value : 4561561
int converted value : 4561561

Program 2:

To demonstrate intValueExact() method for negative number >-2,147,483,648

Java


 // Java program to demonstrate intValueExact()
// method of BigInteger Class

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Creating a BigInteger object
        BigInteger big = new BigInteger("-8546512");

        // print value of BigInteger
        System.out.println("BigInteger value : "
                           + big);

        // convert big to the int value
        int b1 = big.intValueExact();

        // print int value
        System.out.println("int converted value : "
                           + b1);
    }
}

Output:

BigInteger value : -8546512
int converted value : -8546512

Program 3:

To demonstrate intValueExact() method for negative number <-2,147,483,648. It will throw Arithmetic Exception

Java


 // Java program to demonstrate intValueExact()
// method of BigInteger Class

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Creating a BigInteger object
        BigInteger big = new BigInteger("-3000000000");

        // print value of BigInteger
        System.out.println("BigInteger value : "
                           + big);

        try {
            // convert big to the int value
            int b1 = big.intValueExact();

            // print int value
            System.out.println("int converted value : "
                               + b1);
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

Output:

BigInteger value : -3000000000
Exception: java.lang.ArithmeticException: BigInteger out of int range

Program 4:

To demonstrate intValueExact() method for positive number >2,147,483,647. It will throw Arithmetic Exception

Java


 // Java program to demonstrate intValueExact()
// method of BigInteger Class

import java.math.*;

public class GFG {

    public static void main(String[] args)
    {

        // Creating a BigInteger object
        BigInteger big = new BigInteger("3000000000");

        // print value of BigInteger
        System.out.println("BigInteger value : "
                           + big);

        try {
            // convert big to the int value
            int b1 = big.intValueExact();

            // print int value
            System.out.println("int converted value : "
                               + b1);
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

Output:

BigInteger value : 3000000000
Exception: java.lang.ArithmeticException: BigInteger out of int range

Reference: https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#intValueExact--

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