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Java BigInteger Class | nextProbablePrime() Method with Example

BigInteger Class nextProbablePrime() method: Here, we are going to learn about the nextProbablePrime() method of BigInteger Class with its syntax and example.
Submitted by Preeti Jain, on May 11, 2020

BigInteger Class nextProbablePrime() method

• nextProbablePrime() method is available in java.math package.
• nextProbablePrime() method is used to get the next probable prime number that should be higher than this BigInteger and there is a limit of composite number that should not exceed 2 pow(-100).
• nextProbablePrime() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• nextProbablePrime() method may throw an exception at the time of returning the next probable prime number.
  ArithmeticException: This exception may throw when the value of this BigInteger is negative.

Syntax:

    public BigInteger nextProbablePrime();

Parameter(s):

• None

Return value:

The return type of this method is BigInteger, it returns BigInteger that holds the value larger than this BigInteger and it is probably prime.

Example:

// Java program to demonstrate the example 
// of BigInteger nextProbablePrime() method of BigInteger

import java.math.*;

public class NextProbablePrimeOfBI {
    public static void main(String args[]) {
        // Initialize two variables str1 and str2
        String str1 = "13";
        String str2 = "6";

        // Initialize two BigInteger objects  
        BigInteger b_int1 = new BigInteger(str1);
        BigInteger b_int2 = new BigInteger(str2);

        // returns the next prime number
        // of this BigInteger b_int1 so the value of
        // this BigInteger is 13 then the next prime
        // after 13 is 17
        BigInteger next_prime = b_int1.nextProbablePrime();
        System.out.println("b_int1: " + b_int1);
        System.out.println("b_int1.nextProbablePrime(): " + next_prime);

        System.out.println();

        // returns the next prime number
        // of this BigInteger b_int2 so the value of
        // this BigInteger is 6 then the next prime
        // after 6 is 7
        next_prime = b_int2.nextProbablePrime();
        System.out.println("b_int2: " + b_int2);
        System.out.println("b_int2.nextProbablePrime(): " + next_prime);
    }
}

Output

b_int1: 13
b_int1.nextProbablePrime(): 17

b_int2: 6
b_int2.nextProbablePrime(): 7