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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.util;

import java.io.Serializable;

public interface Stack extends Serializable {
  public boolean isEmpty();

  public Object peek();

  public Object peek2();

  public void add(Object obj);

  public void push(Object obj);

  public Object pushAndPeek(Object obj);

  public void push(Object obj1, Object obj2);

  public void push(Object obj1, Object obj2, Object obj3);

  public Object pop();

  public Object pop2();

  public void discard();

  public void clear();

  public int size();

  public void showStack();
}