让控制台等待用户输入关闭

我有一个控制台应用，在执行其任务后，必须向用户提供反馈，例如“操作完成”或“操作失败”以及详细的错误。

问题是，如果我只是“让它运行”，输出消息将被打印出来，但控制台不久之后就会关闭，没有时间读取消息。

据我所知，在 c + + 中，每个控制台应用都会以“按任意键退出”之类的结尾。在 C # 中，我可以使用

Console.ReadKey();

但是用 Java 怎么做呢？我正在使用 Scanner 类，但是考虑到“ input”是我的 Scanner 实例:

input.next()
System.exit(0);

“任何钥匙”都行，除了回车，这可是个大问题，有什么建议吗？

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最佳答案

In Java this would be System.in.read()

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The problem with Java console input is that it's buffered input, and requires an enter key to continue.

There are these two discussions: Detecting and acting on keyboard direction keys in Java and Java keyboard input parsing in a console app

The latter of which used JLine to get his problem solved.

I personally haven't used it.

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I've put in what x4u said. Eclipse wanted a try catch block around it so I let it generate it for me.

try {
System.in.read();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

It can probably have all sorts of bells and whistles on it but I think for beginners that want a command line window not quitting this should be fine.

Also I don't know how common this is (this is my first time making jar files), but it wouldn't run by itself, only via a bat file.

java.exe -jar mylibrary.jar

The above is what the bat file had in the same folder. Seems to be an install issue.

Eclipse tutorial came from: http://eclipsetutorial.sourceforge.net/index.html

Some of the answer also came from: Oracle Thread

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I'd like to add that usually you'll want the program to wait only if it's connected to a console. Otherwise (like if it's a part of a pipeline) there is no point printing a message or waiting. For that you could use Java's Console like this:

import java.io.Console;
// ...
public static void waitForEnter(String message, Object... args) {
Console c = System.console();
if (c != null) {
// printf-like arguments
if (message != null)
c.format(message, args);
c.format("\nPress ENTER to proceed.\n");
c.readLine();
}
}
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You can just use nextLine(); as pause

import java.util.Scanner
//
//
Scanner scan = new Scanner(System.in);


void Read()
{
System.out.print("Press any key to continue . . . ");
scan.nextLine();
}

However any button you press except Enter means you will have to press Enter after that but I found it better than scan.next();

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I used simple hack, asking windows to use cmd commands , and send it to null.

// Class for Different hacks for better CMD Display
import java.io.IOException;
public class CMDWindowEffets
{
public static void getch() throws IOException, InterruptedException
{
new ProcessBuilder("cmd", "/c", "pause > null").inheritIO().start().waitFor();
}
}
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public static void main(String args[])
{
Scanner s = new Scanner(System.in);


System.out.println("Press enter to continue.....");


s.nextLine();
}

This nextline is a pretty good option as it will help us run next line whenever the enter key is pressed.

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A simple trick:

import java.util.Scanner;


/* Add these codes at the end of your method ...*/


Scanner input = new Scanner(System.in);
System.out.print("Press Enter to quit...");
input.nextLine();

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