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public class Stack<T>{
 
   private ArrayList<T>  list;
   public Stack(){
          list =  new ArrayList<T>();
}
          public T pop(){
              if(list.size != 0 ){
                 T popOut = list.get(list.size - 1);
                 remove(popOut);
                 return popOut;
             }
             else{
               return null;
            }
 }
}
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