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