此方法以ASCII艺术形式创建小的状态栏，以便在控制台或日志文件中进行打印。

//package com.nowjava;/*来 自 N o w  J a v a  .   c o m*/


public class Main {

    public static void main(String[] argv) throws Exception {

        int length = 2;

        double d = 2.45678;

        boolean showPercentage = true;

        System.out.println(createPercentageBar(length, d, showPercentage));

    }


    /**

     * This method creates small status bars in ASCII art for printing in the

     * console or in log files. The status bar looks like "[********.........]"

     * without shown percentage or "[*******........] ( 45%)" with percentage

     * shown.

     * 

     * @param length

     *            is the total length of the status bar. In this length the

     *            brackets are included. The percentage number is extra length.

     * @param d

     *            is the percentage to show.

     * @param showPercentage

     *            defines whether the percentage value is to be shown.

     * @return A String is returned containing the ASCII art representation of

     *         the string

     */

    public static String createPercentageBar(int length, double d,/**来自 时   代    Java - nowjava.com**/

            boolean showPercentage) {

        StringBuffer buffer = new StringBuffer("[");

        int starNum = (int) Math.round(d * (length - 2));

        for (int dummy = 1; dummy <= length - 2; dummy++) {

            if (dummy <= starNum) {

                buffer.append('*');

            } else {

                buffer.append('.');

            }

        }

        buffer.append(']');

        if (showPercentage) {

            buffer.append(" (");

            StringBuffer num =