如何创建一个像手机一样的秒/毫秒计时器？
如何创建一个像手机一样的秒/毫秒计时器？
提问于 2018-06-15 00:49:43
我是用Java编程的新手，可以看作是一个新手。然而，我仍然有很多东西要学，我正在尝试创建一个带有倒计时和秒表的迷你乘法游戏。我的愿望是秒表在倒计时说“开始！”的时候能以秒和毫秒为单位计时。我想展示一下玩家花了多长时间来解决这些问题。我试着查找一个关于如何初始化秒表的教程，但是，它似乎没有初始化。我知道这一点，因为我打印值，secondsPassed，最后结果是0。有没有人可以帮我修复代码，这样我就可以在"Go!“之后的几秒钟和几毫秒内启动一个计时器。并在游戏结束后显示时间？谢谢。
import java.util.Scanner;
import java.util.Timer;
import java.util.TimerTask;
public class Mathgame {
public static int secondsPassed = 0;
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
secondsPassed++;
}
};
public void start() {
timer.scheduleAtFixedRate(task,1000,1000);
}
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Welcome to 'The Math Game!' Please chose whether you would like to play or not by inputting 'yes' or 'no'.");
String x = input.nextLine();
if(x.equals ("no")) {
System.out.println("Ok! Maybe next time!");
System.exit(1);
} else {
System.out.println("OK! We are starting the game in...");
System.out.println("3");
try {
Thread.sleep(1000);
} catch(InterruptedException ex){
System.exit(0);
}
System.out.println("2");
try {
Thread.sleep(1000);
} catch(InterruptedException ex) {
System.exit(0);
}
System.out.println("1!!");
try {
Thread.sleep(1000);
} catch(InterruptedException ex) {
System.exit(0);
}
System.out.println("Go!");
System.out.println("Your timer started!");
System.out.println(secondsPassed);
}
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-15 04:08:52
我不知道你想做什么，但我对你的代码做了一些修改，这让它更有趣，更干净……
public class Mathgame {
// it is not necessary do it static
public int secondsPassed = 0;
//alternatively you can use Timer timer = new Timer(true); if you want to stop timer immediately after method main is finished
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
secondsPassed++;
// your timer will run this method every 1 sec, so you need to put output here if you want to see changes
System.out.println("Running my task again. secondsPassed is " +secondsPassed);
}
};
public void start() {
//this timmer will run your task every 1000ms (1 second) and will start in 1000ms (1 second) after start is called
timer.scheduleAtFixedRate(task, 1000, 1000);
}
// this is main method so it is better to throw exceptions upper then handler them without output
public static void main(String[] args) throws InterruptedException {
Scanner input = new Scanner(System.in);
System.out.println("Welcome to 'The Math Game!' Please chose whether you would like to play or not by inputting 'yes' or 'no'.");
String x = input.nextLine();
// it is better to check for 'yes' than for 'no' this is good practice
if (x.equalsIgnoreCase("yes") || x.equalsIgnoreCase("y")) {
System.out.println("OK! We are starting the game in...");
System.out.println("3");
Thread.sleep(1000);
System.out.println("2");
Thread.sleep(1000);
System.out.println("1!!");
Thread.sleep(1000);
System.out.println("Go!");
//starting your timer, we have to create object of your class first and then run method start
Mathgame mathgame = new Mathgame();
mathgame.start();
System.out.println("Your timer started!");
//main is finished however there is timer thread which is still working
// if you want to stop timer immediately after main then you need to build it as 'Timer timer = new Timer(true);'
// in that case you may put here extra sleep and see how timer is working
//let wait until timer will count 10 sec
Thread.sleep(10000);
//you can check secondsPassed from main too
System.out.println("This is called from main. secondsPassed value is " + mathgame.secondsPassed);
System.out.println("Method main is finished");
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50862409
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