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Completablefuture Api Improvements Java String Replacefirst Java Iterator Net Urldate Java String Equals Java Hashmap Values Java Arraylist Containsall Java Inheritance Arrays Output Java String Substring Number Rint Exception Thread Java Stringbuffer Java String Contentequals Number Tostring Java File Java String Copyvalueof Data Element Number Floor Java Object Notify Dir Empty Java Enumeration Interface Java Print Rect Method Label Dir Delete Java Hashtable Class Method Array Java Object Tostring Java Enum Java String Isempty File Date Modify Java String Regionmatches Character Islowercase Java Interfaces Java Arraylist Remove File Size Collection Replace Thread Monitor File Exist Arrays_Merge Collection Iterate Number Valueof Exception Method Java Properties Class Java Hashmap Remove String Search Java Package Thread Suspend File Create Temp Dir Current Java Files Io Java Inner Class Java Arraylist Clone Java Hashmap Replaceall Dir Search Java Datainputstream Collection Hashtable Key Java Arraylist Trimtosize Java Networking Java Object Wait Timeout Nanos Java Loop Java Object Class Dir Modification Java Object Hashcode Number Abs Data Stack Number Asin Collection Shuffle Collection Compare Java Anonymous Class Java Arraylist Sublist Java8 Optional Class Java Hashmap Containsvalue Data Add Java Environment Setup Dir Hierarchy Java Arraylist Foreach Java9 Process Api Improvements Number Cos Java Documentation String Split Java String Endswith Character Isdigit Collection All Arrays Search Number Atan Dir Display Net Url Header Method Continue String Optimization Java Bytearrayoutputstream Number Max Java String Trim Number Min Java Arraylist Isempty Java String Charat Java Dataoutputstream Java Regular Expressions Java String Subsequence Data Queue Java Arraylist Replaceall String Format Java Map Interface Arrays Insert Net Filetime Java String Hashcode Java String Length Collection Minmax Method Factorial Dir Parent Number Sqrt Arrays Extension Java Arraylist 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import java.util.*;

public class Main {
   private LinkedList list = new LinkedList();
   public void push(Object v) {
      list.addFirst(v);
   }
   public Object top() {
      return list.getFirst();
   }
   public Object pop() {
      return list.removeFirst();
   }
   public static void main(String[] args) {
      Main stack = new Main();
      for (int i = 30; i < 40; i++)
         stack.push(new Integer(i));
      System.out.println(stack.top());
      System.out.println(stack.pop());
      System.out.println(stack.pop());
      System.out.println(stack.pop());
   }
}

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