Java convert BigInteger to int

Tags: BigInteger BigInteger intValueExact BigInteger intValue int

In this Java core tutorial we learn how to use the java.math.BigInteger.intValueExact() and java.math.BigInteger.intValue() method to convert a BigInteger object into an integer value.

How to convert BigInteger object to int value

To convert a BigInteger value into int value we can use the method java.math.BigInteger.intValueExact(). This method also checks the value of BigInteger if it is out of range of integer then an ArithmeticException is thrown.

ConvertBigIntegerToIntExample1.java 

import java.math.BigInteger;

public class ConvertBigIntegerToIntExample1 {
    public static void main(String... args) {
        BigInteger value = new BigInteger("78999");

        int intValue = value.intValueExact();

        System.out.println("BigInteger value: " + value);
        System.out.println("int value: " + intValue);
    }
}
The output is: 
BigInteger value: 78999
int value: 78999

We also can use the java.math.BigInteger.intValue() method which casts the BigInteger value to int.

ConvertBigIntegerToIntExample2.java 

import java.math.BigInteger;

public class ConvertBigIntegerToIntExample2 {
    public static void main(String... args) {
        BigInteger value = new BigInteger("65999");

        int intValue = value.intValue();

        System.out.println("BigInteger value: " + value);
        System.out.println("int value: " + intValue);
    }
}
The output is: 
BigInteger value: 65999
int value: 65999

Happy Coding 😊

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