Print First 10 Prime Numbers in Java

Print First 10 Prime Numbers in Java | Prime numbers are natural numbers that are divisible by only 1 and the number itself. In other words, prime numbers are positive integers greater than 1 with exactly two factors, 1 and the number itself. Also see:- Prime Number Program in Java

For example– 2 is a prime number because it has only two factors 1 and 2.

Similarly,
4 is not a prime number because it has more than 2 factors that are 1, 2, and 4.

Note:- All negative numbers, 0 and 1 are not the prime numbers.

Print First 10 Prime Numbers in Java

In this program, we will use the While Loop to print the first 10 prime numbers.

Program description:- Write a program to print the first 10 prime numbers in java

public class PrimeNumber {

  public static boolean isPrime(int number) {

    /* Negative numbers, 0 and 1 
    * are not a prime number
    * 
    * Even numbers (except 2) are
    * also not a prime number
    */
    if(number == 2) return true;
    else if(number<=1 || number%2==0)
         return false;

    // logic for remaining numbers
    for(int i=3; i<=Math.sqrt(number); i++){
         if(number%i == 0) return false;
    }

    return true;
  }

  public static void main(String[] args) {

    System.out.println(
      "The First 10 prime numbers in Java are::");

    // variables
    int i=1, count=0;

    // loop to repeat the process
    while(count<10) {
       if(isPrime(i)) {
          System.out.print( i + " ");
          count++;
       }
       i++;
    }
  }
}

Output:-

The first 10 prime numbers in Java are::
2 3 5 7 11 13 17 19 23 29

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