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Prime Number Program in Java

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Prime Number Program in Java: The prime number is a natural number who value is greater than 1 and can be divisible by 1 and by itself. The number of counts to find the prime numbers is 2 because it can divisible only by 1 and by itself For example: 6 - can be divisible by 1x6,2x3,3x2,6x1. where the count is 4 and it is not a prime number 7 - can be divisible by 1x7,7x1. where the count is 2 and it is a prime number Example 1: Program to check whether the given number is prime number or not import java.util.Scanner; public class Primenumbers { public static void main(String[] args) { int i =2; boolean flag = true; System.out.print("Enter the number to find it is prime or not: "); Scanner sc = new Scanner(System.in); int n = sc.nextInt(); if(n<0) { System.out.println("The prime number cannot be negative"); } else { while(i<n) { if(n%i==0) { flag = false; break; } i++;...
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Difference between StringBuffer and StringBuilder

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StringBuffer and StringBuilder: The string is immutable class which created the new String object whenever the string is concat or append. The StringBuffer and StringBuilder are mutable class where it will not create the new String object at the time of append / concat instead it just modify the String in same object. Even though StringBuffer and StringBuilder terminology are same, but there is some difference in it which we are going to discuss now. StringBuffer: In StringBuffer every methods are synchronized which means only one thread is allowed to append the string with the cost of performance. It provides thread safety which allows only one thread to perform whereas the other thread has to wait for it's time. java.lang.StringBuffer extends java.lang.AbstractStringBuilder implements java.io.Serializable, java.lang.CharSequence Constructor: StringBuffer() - It will create the empty buffer with initial capacity of 16 StringBuffer(String s) - it will create buffer...
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Multiple image upload to database and display from it

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Upload image into the database and retrieve from it Video: Multiple image upload and display from database Create the database name as 'image' and just copy this table given below Database CREATE TABLE IF NOT EXISTS `multiple` ( `id` int(255) NOT NULL AUTO_INCREMENT, `name` varchar(255) NOT NULL, `image` longblob NOT NULL, PRIMARY KEY (`id`) ) Html: In this form tag make sure that you set the '[ ]' in the input tag and 'multiple' use to select the multiple image PHP: (upload and display) mysql_connect("localhost","root",""); mysql_select_dB("image"); if(isset($_POST["submit"])){ $filename = $_FILES['img']['name']; $file_tmp = $_FILES['img']['tmp_name']; $filetype = $_FILES['img']['type']; $filesize = $_FILES['img']['size']; for($i=0; $i "; } } } } $res = mysql_query("SELECT * FROM multiple"); ...
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