Something

static int[] a = new int[100];
	static int index = 3;
	static
	{
		a[0]=2;
		a[1]=3;
		a[2]=5;
		a[3]=7;
	}

	public int nextPrime()
	{		
		while(true)
		{
			for(int i=0; i<index ; i++)
			{
			    if(n % a[i] ==0)
                            {
                               n++;
                               break;

                            }else
                               return n;
			}
                        
                       
			
		}
	
	}