包java.util的堆栈类。

import java.util.Stack;//N o w J a v a . c o m - 时代Java

import java.util.EmptyStackException;


public class Main 

{

   public static void main(String[] args)

   {

      Stack<Number> stack = new Stack<>(); // create a Stack


      // use push method

      stack.push(12L); // push long value 12L

      System.out.println("Pushed 12L");

      printStack(stack);

      stack.push(34567); // push int value 34567

      System.out.println("Pushed 34567");/*时 代 J a v a 公 众 号 - nowjava.com*/

      printStack(stack);

      stack.push(1.0F); // push float value 1.0F

      System.out.println("Pushed 1.0F");

      printStack(stack);

      stack.push(1234.5678); // push double value 1234.5678

      System.out.println("Pushed 1234.5678 ");

      printStack(stack);


      // remove items from stack

      try 

      {

         Number removedObject = null;


         // pop elements from stack

         while (true) 

         {

            removedObject = stack.pop(); // use pop method

            System.out.printf("Popped %s%n", removedObject);

            printStack(stack);

         } 

      } 

      catch (EmptyStackException emptyStackException) 

      {

         emptyStackException.printStackTrace();

      } 

   } 


   // display Stack contents

   private static void printStack(Stack<Number> st