BigInteger class

In this chapter you will learn:

How to use Java BigInteger class
How to compare with BigInteger constant value

BigInteger

BigInteger is an immutable class that represents a signed integer of arbitrary precision.

BigInteger declares three convenience constants: ONE, TEN, and ZERO. Each constant is the BigInteger equivalent of 1, 10, and 0.

import java.math.BigInteger;
/*from  ja v a 2 s .co m*/
public class Main {
  public static void main(String[] args) {
    BigInteger numberB = BigInteger.TEN;

  }
}

Compare with BigInteger constant value

We can compare BigInteger value against the constant value.

import java.math.BigInteger;
/*from j  av a  2s .  com*/
public class Main {
  public static void main(String[] args) {
    System.out.println(factorial(new BigInteger("170")));
  }

  static BigInteger factorial(BigInteger n) {
    if (n.equals(BigInteger.ZERO))
      return BigInteger.ONE;
    else
      return n.multiply(factorial(n.subtract(BigInteger.ONE)));
  }
}