从控制台读取一个浮点数

//package com.nowjava;// from n o w j a   v  a . c o m - 时  代  Java

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;


public class Main {

    private static BufferedReader buffer = new BufferedReader(

            new InputStreamReader(System.in));


    /**

     * Reads a float from console

     * 

     * @return the read float

     * @throws IOException

     *             If an IO error occurs

     */

    public static