Заполнение Stack и вывод на печать

/**
 *  @author Lewis and Chase
 */
package jss2;
import jss2.exceptions.*;
public class ArrayStack<T> implements StackADT<T>
{
    private final int DEFAULT_CAPACITY = 100;
    private int top;  
    private T[] stack;
 
    public ArrayStack(){
     top = 0;
     stack = (T[])(new Object[DEFAULT_CAPACITY]);
    }
    public ArrayStack (int initialCapacity){
     top = 0;
     stack = (T[])(new Object[initialCapacity]);
    }
    public void push (T element){
      if (size() == stack.length) 
      expandCapacity();
 
      stack[top] = element;
      top++;
    }
    public T pop() throws EmptyCollectionException{
      if (isEmpty())
      throw new EmptyCollectionException("Stack");
 
      top--;
      T result = stack[top];
      stack[top] = null; 
 
      return result;
    }
    public T peek() throws EmptyCollectionException{
     if (isEmpty())
      throw new EmptyCollectionException("Stack");
 
     return stack[top-1];
   }
  public boolean isEmpty(){
    return (top == 0);
  }
 
  public int size(){
    return top;
  }
 
  public String toString(){
    String result = "";
 
    for (int scan=0; scan < top; scan++)
      result = result + stack[scan].toString() + "\n";
 
    return result;
  }
 
  
  private void expandCapacity(){
    T[] larger = (T[])(new Object[stack.length*2]);
    
    for (int index=0; index < stack.length; index++)
      larger[index] = stack[index];
    
    stack = larger;
  }
}

package jss2.exceptions;
 
public class EmptyCollectionException extends RuntimeException
{
  /**
   * Sets up this exception with an appropriate message.
   * @param collection String representing the name of the collection
   */
  public EmptyCollectionException (String collection)
  {
    super ("The " + collection + " is empty.");
  }
}

public Type pop() {
   return stack.remove(stack.size() - 1);
}

throw new YourException()

   public static void main(String[] args) {
      Stack<Integer> stack = new Stack<Integer>();
      int i;
      for (i = 0; i < 10; ++i)
         stack.push(i);
      System.out.println(stack.toString());
      System.out.println("Is stak empty? "
            + (stack.empty() ? "True" : "False. Size = " + stack.size()));
      for (i = 0; i < 10; ++i)
         System.out.print(stack.pop() + " ");
      System.out.println();
      stack.pop();
 
   }
 
}