java中关于Stack的LIFO一段非常简单，非常典型的小代码

 

 

package test;

//: Stacks.java
// Demonstration of Stack Class
import java.util.*;

public class Stacks {
  static String[] months = {
    "January", "February", "March", "April",
    "May", "June", "July", "August", "September",
    "October", "November", "December" };
  public static void main(String[] args) {
    Stack<String> stk = new Stack<String>();
    for(int i = 0; i < months.length; i++)
      stk.push(months[i] + " ");
    System.out.println("stk = " + stk);
    // Treating a stack as a Vector:
    stk.addElement("The last line");
    System.out.println(
      "element 5 = " + stk.elementAt(5));
    System.out.println("popping elements:");
    while(!stk.empty())
      System.out.println(stk.pop());
  }
} ///:~

 

运行结果

stk = [January , February , March , April , May , June , July , August , September , October , November , December ]
element 5 = June
popping elements:
The last line
December
November
October
September
August
July
June
May
April
March
February
January

months数组的每一行都通过push()继承进入堆栈，稍后用pop()从堆栈的顶部将其取出。要声明的一点是，Vector操作亦可针对Stack对象进行。这可能是由继承的特质决定的——Stack“属于”一种Vector。因此，能对Vector进行的操作亦可针对Stack进行，例如elementAt()方法。