Java如何處理空堆疊異常？

在Java編程中，如何處理空堆疊異常？

本例展示了如何使用Date類的System.currentTimeMillis()方法和Stack類的s.empty()，s.pop()方法來處理空堆疊異常。

package com.zaixian;

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");
    }
}

上述代碼示例將產生以下結果 -

Testing for empty stack
46 milliseconds
Catching EmptyStackException
1561 milliseconds