reverse a string using stacks

class reverse_a_string_using_stack
{
  public static void main(String[] args)
  {
     String input="vinayak";  
     reverse(input);
  }
  static String input="vinayak";
  static int l=input.length();
  static char array[]=new char[l];
  static int top=-1;
   static char stackarray[]=new char[l];
  static void reverse(String input)
  {
     for (int j = 0; j < l; j++) 
     {
         char ch = input.charAt(j);
        push(ch);
     }

        if(top>=0)
        {
            System.out.println("Elements in the Stack ");
            for(int i=0;i<l;i++)
            {
                System.out.println("   --->>>"+stackarray[i]);
            }
        }
    
      System.out.println(" Reversed String is = .");
       for (int i = 0; i <l; i++) 
     {       
          pop();
     }
  }
    
     public static void push(char value)
    {
         top++;
          stackarray[top]=value;                       
    }
    
    public static void pop()
    {
        
        if(top>=0)
        {                
              System.out.print(stackarray[top]);
                 top--;  
        }
    }
    
}