在Java编程中，如何处理空堆栈异常？

本例展示了如何使用Date类的System.currentTimeMillis()方法和Stack类的s.empty()，s.pop()方法来处理空堆栈异常。

package com.yiibai;

import java.util.Date;

import java.util.EmptyStackException;

import java.util.Stack;

public class EmptyStackExcept {

    public static void main(String[] args) {

        int count = 1000000;

        Stack s = new Stack();

        System.out.println("Testing for empty stack");

        long s1 = System.currentTimeMillis();

        for (int i = 0; i <= count; i++)

            if (!s.empty())

                s.pop();

        long s2 = System.currentTimeMillis();

        System.out.println((s2 - s1) + " milliseconds");

        System.out.println("Catching EmptyStackException");

        s1 = System.currentTimeMillis();

        for (int i = 0; i <= count; i++) {

            try {

                s.pop();

            } catch (EmptyStackException e) {

            }

        }

        s2 = System.currentTimeMillis();

        System.out.println((s2 - s1) + " milliseconds");

    }

}

上述代码示例将产生以下结果 -

Testing for empty stack

46 milliseconds

Catching EmptyStackException

1561 milliseconds