Related Articles

# BigInteger nextProbablePrime() Method in Java with Examples

• Last Updated : 08 Apr, 2019

The java.math.BigInteger.nextProbablePrime() is used to find the first integer greater than this BigInteger that is probably prime. If this method returns ‘p’ then there is no prime number ‘q’ between this Biginteger and ‘p’ (this < q < p ) i.e. it never skips any prime number greater than BigInteger that is used to call the method.

Syntax:

```public BigInteger nextProbablePrime()
```

Parameters: The method doesn’t accept any Parameters.
Return: This method returns a Biginteger which holds the first integer greater than this BigInteger that is probably prime number.

Exception: The number must be non – negative and not too large otherwise Arithmetic Exception is thrown.

Below programs illustrate nextProbablePrime() method of BigInteger class

Example 1:

 `// Java program to demonstrate``// nextProbablePrime() method of BigInteger`` ` `import` `java.math.BigInteger;`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// BigInteger object to store the result``        ``BigInteger result;`` ` `        ``// For user input``        ``// Use Scanner or BufferedReader`` ` `        ``// object of String created``        ``// Holds the value to find next prime number``        ``String input1 = ``"1516132"``;`` ` `        ``// Creating BigInteger object``        ``BigInteger a``            ``= ``new` `BigInteger(input1);`` ` `        ``// Using nextProbablePrime()``        ``result = a.nextProbablePrime();`` ` `        ``// Print result``        ``System.out.println(``"The next probable"``                           ``+ ``" Prime number is "``                           ``+ result);``    ``}``}`
Output:
```The next probable Prime number is 1516153
```

Example 2: Printing all Prime number below 100

 `// Java program to demonstrate``// nextProbablePrime() method of BigInteger`` ` `import` `java.math.BigInteger;`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// BigInteger object to store the result``        ``BigInteger result;`` ` `        ``// Creating BigInteger objects``        ``BigInteger a;`` ` `        ``// Printing all prime numbers``        ``// Below 100``        ``for` `(``int` `i = ``0``; i < ``100``😉 {``            ``a = ``new` `BigInteger(``                ``Integer.toString(i));`` ` `            ``// Using nextProbablePrime()``            ``result = a.nextProbablePrime();`` ` `            ``// Print the answer``            ``if` `(Integer.parseInt(``                    ``result.toString())``                ``< ``100``) {``                ``System.out.print(result + ``" "``);``            ``}`` ` `            ``i = Integer.parseInt(``                ``result.toString());``        ``}``    ``}``}`
Output:
```2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
```

Example 3: Program showing exception when value is negative.

 `// Java program to demonstrate``// nextProbablePrime() method of BigInteger`` ` `import` `java.math.BigInteger;`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// BigInteger object to store the result``        ``BigInteger result;`` ` `        ``// For user input``        ``// Use Scanner or BufferedReader`` ` `        ``// object of String created``        ``// Holds the value to find prime number``        ``String input1 = ``"-5"``;`` ` `        ``// Creating BigInteger objects``        ``BigInteger a``            ``= ``new` `BigInteger(input1);`` ` `        ``try` `{``            ``// Using nextProbablePrime()``            ``result = a.nextProbablePrime();``        ``}``        ``catch` `(ArithmeticException e) {``            ``System.out.println(e);``        ``}``    ``}``}`
Output:
```java.lang.ArithmeticException: start < 0: -5
```

To know about checking current BigInteger is prime or not, visit isProbablePrime() Method in Java page.

Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more,  please refer Complete Interview Preparation Course.

My Personal Notes arrow_drop_up