从控制台读取整数

//package com.nowjava;

import java.io.BufferedReader;
/** 
 来自 NowJava.com - 时代Java**/

import java.io.IOException;

import java.io.InputStreamReader;


public class Main {

    private static BufferedReader buffer = new BufferedReader(

            new InputStreamReader(System.in));


    /**

     * Read an integer from console

     * 

     * @return The read integer

     * @throws IOException

     *             If an IO error occurs

     */

    public static