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SEO stands for Search Engine Optimization. SEO is the process or activity of optimizing website or web pages  in order to make them available at higher position in search results of search engines. Some of worlds powerful search engines are Google, Yahoo, and Bing.

Java Factorial Program using Recursion

class FactorialRecusionProgramExample{

static int facto(int a){  
  if (a == 0)  
    return 1;  
  else  
    return(a * facto(a-1));  
 }  
 public static void main(String args[]){
  int i,f=1;
  int num=5;//Number for which we are calculating factorial  
  f = facto(num);  
  System.out.println("Factorial of "+num+" is: "+f);  
 }
} 

Java Factorial Program

class FactorialExampleProg{

public static void main(String args[]){
  int j,f=1;
  int num=5;//Number for which we want to calculate factorial  
  for(j=1;j<=num;j++){  
      f=f*j;  
  }  
  System.out.println("Factorial of "+num+" is: "+f);  
 }
}

Java program to check Prime number

class PrimenumExample{  
 public static void main(String args[]){  
  int j,m=0,f=0;    
  int n=7;//Number which we want to check  
  m=n/2;    
  for(j=2;j<=m;j++){    
   if(n%j==0){    
   System.out.println("Number is not prime");    
   f=1;    
   break;    
   }    
  }    
  if(f==0)    
  System.out.println("Number is prime");    
}  
} 

Java Program to reverse a string

import java.util.*;
 
class RevString
{
   public static void main(String args[])
   {
      String orig, rev = "";
      Scanner in = new Scanner(System.in);
 
      System.out.println("Enter a string you want to reverse :");
      orig = in.nextLine();
 
      int length = orig.length();
 
      for ( int i = length - 1 ; i >= 0 ; i-- )
         rev = rev + orig.charAt(i);
 
      System.out.println("Reverse of string is: "+rev);
   }
}