java - 为什么打印语句 "=>"在您输入扫描仪输入后出现

Question

我正在尝试创建一个基于文本的冒险游戏，并且我正在尝试添加一个功能，每当游戏需要您输入时，一个小勾号“=>”将显示在您输入的位置旁边。使用此处的代码，每当我在命令提示符 (Windows 7) 中运行它时，输入都会显示，而小勾号不会显示。输入后，勾号会出现在输入后。我希望能够像这样将刻度线和输入全部放在一行中，“=> [使用输入]”。请帮忙!

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() 刷新输出流。如需更多帮助，请参阅 this example或 docs .

刷新输出流将帮助您找出代码失败的地方。