## JAVA EXAMPLE PROGRAMS

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# Program: Write a program to check the given number is a prime number or not?

 Description: A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is prime, as only 1 and 5 divide it, whereas 6 is composite, since it has the divisors 2 and 3 in addition to 1 and 6. The fundamental theorem of arithmetic establishes the central role of primes in number theory: any integer greater than 1 can be expressed as a product of primes that is unique up to ordering. This theorem requires excluding 1 as a prime.

 Code: ```package com.java2novice.algos; public class MyPrimeNumCheck { public boolean isPrimeNumber(int number){ for(int i=2; i<=number/2; i++){ if(number % i == 0){ return false; } } return true; } public static void main(String a[]){ MyPrimeNumCheck mpc = new MyPrimeNumCheck(); System.out.println("Is 17 prime number? "+mpc.isPrimeNumber(17)); System.out.println("Is 19 prime number? "+mpc.isPrimeNumber(19)); System.out.println("Is 15 prime number? "+mpc.isPrimeNumber(15)); } } ```

 Output: ```Is 17 prime number? true Is 19 prime number? true Is 15 prime number? false ```

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Daemon thread is a low priority thread. It runs intermittently in the back ground, and takes care of the garbage collection operation for the java runtime system. By calling setDaemon() method is used to create a daemon thread.
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 Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle. Privacy Policy | Copyright © 2022 by Nataraja Gootooru. All Rights Reserved.