使用扫描仪从控制台输入字符串

//package com.nowjava;


import java.util.Scanner;/** 时   代     Java  公  众  号 - nowjava.com 提供 **/


public class Main {

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

        String question = "nowjava.com";

        String regex = "nowjava.com";

        System.out.println(inputString(question, regex));

    }


    public static String inputString(String question, String regex) {

        return inputString(question, regex, "");

    }


    public static String inputString(String question, String regex,

            String help) {

        String answer = "";

        boolean matches = false;/*时   代    Java - nowjava.com 提 供*/

        System.out.print(messageBox(question));

        while (!matches) {

            answer = new Scanner(System.in).next();

            if (answer.matches(regex)) {

                matches = true;

            } else {

                System.out.print(messageBox(help, question));

            }

        }


        return question;

    }


    public static String messageBox(String... messages) {


        if (messages.length > 0) {

            int maxLength = messages[0].length();

            for (int i = 1; i < messages.length; i++) {

                if (maxLength < messages[i].length()) {

                    maxLength = messages[i].length();

                }

            }

            if (maxLength > 0) {

                StringBuilder sb = new StringBuilder("");

                sb.append(String.format("%s%-" + maxLength + "s%s", "+ ",

                        " ", " +\n").replace(" ", "-"));

                for (String message : messages) {

                    if (message.length() > 0) {

                        sb.append("| ")

                                .append(String.format("%-" + maxLength

                                        + "s", message)).append(" |\n");

                    }