為什么打印聲明“=>”在您輸入掃描儀輸入后出現

Question

我正在嘗試創建一個基於文本的冒險游戲，我正在嘗試添加一個功能，每當游戲需要您輸入時，一個小刻號，“=>”將顯示在您輸入的位置旁邊。 使用此代碼，每當我在命令提示符（Windows 7）中運行它時，輸入顯示，而小滴答則不顯示。 輸入輸入后，勾選后會顯示。 我希望能夠將勾號和輸入全部放在一行，如“=> [使用輸入]”。 請幫忙！

import java.io.IOException;
import java.util.Scanner;

import org.fusesource.jansi.AnsiConsole;



public class Game {

    public static String BLACK = "\u001B[0;30m";
    public static String RED = "\u001B[0;31m";
    public static String GREEN = "\u001B[0;32m";
    public static String YELLOW = "\u001B[0;33m";
    public static String BLUE = "\u001B[0;34m";
    public static String MAGENTA = "\u001B[0;35m";
    public static String CYAN = "\u001B[0;36m";
    public static String WHITE = "\u001B[0;37m";

    public final static String ESC = "\033[";

    public static String name;
    public static String gender;

    public static void main(String[] args) {
        AnsiConsole.systemInstall();

        check();
    }

    public static void start() {

        Scanner a = new Scanner(System.in);

        System.out.println("###############################################################################");
        System.out.println("#                                                                             #");
        System.out.println("#                        " + YELLOW + "^.^" + WHITE + " " + "Adventure Time Is Yes " + YELLOW + "^.^" + WHITE + "                        #");
        System.out.println("#                                                                             #");
        System.out.println("###############################################################################");

        //Get Name
        System.out.print("\n");
        System.out.println("Hello young lad! What is thy " + RED + "name " + WHITE + "you were given at birth?");
        System.out.print("=> ");
        //Global Variable for Name
        name = a.next();

        System.out.print("\n");

        System.out.println("Hello " + RED + name + WHITE + "! Are you a Male or Female?");
        System.out.print("=> ");
        gender = a.next();


    }

    public static void check() {

        Scanner a = new Scanner(System.in);

        System.out.println("Can you see these colors?: ");
        System.out.println(RED + "Red " + GREEN + "Green " + YELLOW + "Yellow " + BLUE + "Blue " + MAGENTA + "Magenta " + CYAN + "Cyan " + WHITE + "White");
        System.out.println("Y/N");
        System.out.print("=> ");

        String as = a.nextLine();
        as.toUpperCase();

        if (as == "Y") {
            System.out.println(ESC + "2J");
            start();
        } else {
            System.out.println(ESC + "2J");
            start();
            //Future idea is to make it so there is an exact copy of the game but without color :D
        }

    }
}

/*try {
System.in.read();
} catch (IOException e) {
e.printStackTrace();
}

System.exit(0);*/

//System.out.println(ESC + "2J"); Clear Lines On Screen

Answer 1

您可以使用outputstreamName.flush（）刷新輸出流。 有關更多幫助，請參閱此示例或文檔 。

刷新輸出流將幫助您找出代碼失敗的位置。

Answer 2

在請求輸入之前，刷新輸出流，以確保寫入的所有內容都已通過緩沖區。