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PHP Login and Registration script

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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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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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