Java – How to convert int to BigInteger?

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In Java, we can use BigInteger.valueOf(int) to convert int to a BigInteger

JavaExample.java

package com.mkyong;

import java.math.BigInteger;

public class JavaExample {

    public static void main(String[] args) {

        int n = 100;
        System.out.println(n);

        // convert int to Integer
        Integer integer = Integer.valueOf(n);
        System.out.println(integer);

        // convert int to BigInteger
        BigInteger bigInteger = BigInteger.valueOf(n);
        System.out.println(bigInteger);

        // convert Integer to BigInteger
        //BigInteger bigInteger2 = BigInteger.valueOf(integer); // works
        BigInteger bigInteger2 = BigInteger.valueOf(integer.intValue());
        System.out.println(bigInteger2);

    }

}

Output


100
100
100
100

References

  1. BigInteger JavaDoc

mkyong

Founder of Mkyong.com, passionate Java and open-source technologies. If you enjoy my tutorials, consider making a donation to these charities.

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Mohamed Sahil
6 years ago

int n = 100;
BigInteger bigInteger = BigInteger.valueOf(n);

when we write like this it is throwing error.
BigInteger.valueOf() only accepting long value not int value.
So we have to store value like:

long n = 100;
BigInteger bigInteger = BigInteger.valueOf(n);

3
Reply
Vibin
3 years ago
Reply to  Mohamed Sahil

Four

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