0

所以在这段代码中，在“run”方法的“Run”类下，扫描器似乎不想从第一次尝试中接收输入，只有在第二行才接收输入。我说第二行是因为我输入输入然后按两次回车，然后在第三行输入输入，它读取第二行，在这种情况下什么都没有。

我尝试过 BufferedReader 的结果相同，所以我相信我在做一些愚蠢的事情并忽略了一些事情。

import java.util.Scanner;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import java.io.*;

class Global {
    public static int stop = -1;
}

public class DataSort {

    public static void main(String[] args){

        Timer timer = new Timer();
        Direct swit = new Direct();
        Run mprog = new Run();
        Help hlp = new Help();

        String newline = System.getProperty("line.separator");

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        Scanner console = new Scanner(System.in);

        System.out.println(newline);
        System.out.println("Welcome to Data Sort! This Program is designed to sort information about targets discoverd by UAV and place the data in a table." + newline);
        System.out.print("For help, press any key. To continue, please wait. ");
        timer.schedule(swit, 3000);

        try {
            Global.stop = in.read();
        } 

        catch(IOException e) {
            e.printStackTrace();
        }

        try {
            in.close();
        }

        catch(IOException e) {
            e.printStackTrace();
        }
    }
}

class Direct extends TimerTask {

    public void run() {

        Run mprog = new Run();
        Help hlp = new Help();

        if(Global.stop != -1){
            System.out.println("Help");
            hlp.run();
        }

        if(Global.stop == -1) {
            System.out.println("Main");
            mprog.run();
        }
    }
}


class Help {

    public static void run() {
        String newline = System.getProperty("line.separator");

        System.out.print(newline);
        System.out.println("Entering Help Mode!" + newline);

        System.out.println("Entered Help Class");
        //String help = console.nextLine();
    }
}

class Run {

    public static void run() {

        /*EnterAll eall = new EnterAll();
        EnterCoords ecoords = new EnterCoords();
        EnterRelation erelat = new EnterRelation();
        EnterColor ecolor = new EnterColor();
        EnterShape eshape = new EnterShape();
        Coordinates coords = new Coordinates();
        Relation relat = new Relation();
        Color color = new Color();
        Shape shape = new Shape();
        List list = new List();
        Save save = new Save();
        SaveAs saveas = new SaveAs();*/

        String newline = System.getProperty("line.separator");
        Scanner console = new Scanner(System.in);

        System.out.print(newline);
        System.out.println("Initializing Main Program." + newline);
        System.out.println("************************** MAIN MENU *************************" + newline);
        System.out.println("Enter Coords \t Enter Relat \t Enter Color \t Enter Shape"+newline);
        System.out.println("Coordinates \t Relation \t Color \t \t Shape" + newline);
        System.out.println("Help \t \t List \t \t Save \t \t Save As" + newline);
        System.out.println("**************************************************************" + newline);

        System.out.print("Enter your selection or type All to enter lines consecutively: ");
        String raw = console.nextLine();

        System.out.println(raw);

        String select = errorCheck(raw);

        if (select.equals("All")){
        }

        if (select.equals("Enter Coords")){
        }

        if (select.equals("Enter Relat")){
        }

        if (select.equals("Enter Color")){
        }

        if (select.equals("Enter Shape")){
        }

        if (select.equals("Coordinates")){
        }

        if (select.equals("Relation")){
        }

        if (select.equals("Color")){
        }

        if (select.equals("Shape")){
        }

        if (select.equals("Help")){
        }

        if (select.equals("List")){
        }

        if (select.equals("Save")){
        }

        if (select.equals("Save As")){
        }
    }

    private static String errorCheck(String raw) {

        String select = raw;
        return select;
    }
}
4

2 回答 2

1

你的问题在于

public class DataSort {...... Global.stop = in.read(); ......}

因为 in.read 用于读取整数输入。它不读取行尾字符。这就是为什么在您输入选择字符串并按回车后它变得毫无头绪的原因。

问候，拉维

于 2013-03-31T01:12:10.073 回答
0

@Sean，这是您的解决方案

注释掉下面的行

public class DataSort
{
.
.
.
//BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
//Scanner console = new Scanner(System.in);
.
.
.
//Global.stop = in.read();
.
.
}

For Global.stop = in.read(), read from the same input read buffer(may be in the same class or somewhere else) and parse the string as you want. Don't create another input read buffer.

Regards, Ravi

于 2013-03-31T23:50:54.147 回答