Fibbonaci series in java

package fibonacciexample1;

import java.util.Scanner;
class FibonacciExample1{
public static void main(String args[])
{  
     
    Scanner b = new Scanner(System.in);
 int n1=0,n2=1,n3,i,count;  
     System.out.println("Enter limit of series");
      count = b.nextInt();
 System.out.print(n1+" "+n2);//printing 0 and 1  
   
 for(i=2;i<count;++i)//loop starts from 2 because 0 and 1 are already printed  
 {  
  n3=n1+n2;  
  System.out.print(" "+n3);  
  n1=n2;  
  n2=n3;  
 }  
 
}}

Find prime numbers in java

package primeexample;
import java.util.Scanner;
class PrimeExample{
 public static void main(String args[]){
     Scanner b = new Scanner(System.in);
  int i,m=0,flag=0;  
  int n;
  System.out.println("Enter an integer");
  n=b.nextInt();
  m=n/2;  
  for(i=2;i<=m;i++){  
   if(n%i==0){  
   System.out.println("Number is not prime");  
   flag=1;  
   break;  
   }  
  }  
  if(flag==0)  
  System.out.println("Number is prime");  
}
}