Develop Reference

How to timeout a sentence?

I'm trying to write script in groovy that does a some http requests and measure the time of it. Unfortunately, there are some requests that may be too slow to wait for it. I need to check if they are running for some part of time (eg. 1 minute) and if they didn't stop, I need to force stop of executing it.
start = new Date()
value = select.toURL().text // this needs to be timeouted after 1 minute
stop = new Date()

Take a look at
import java.util.Timer;
https://docs.oracle.com/javase/7/docs/api/java/util/Timer.html
Then you can schedule a task like:
// creating timer task, timer
TimerTask tasknew = new TimerSchedulePeriod();
Timer timer = new Timer();
// scheduling the task at interval
timer.schedule(tasknew,100, 100);
Or if you are lazy something like:
timer.schedule(new TimerTask() {
#Override
public void run() {
// Your code here
}
}, timeInMilli);

"runOnUIThread" incrementally running everytime I go back to the activity

I have a timer which runs on the activity's OnCreate method as shown below. When run, the timer increments as it should. Showing:
00:00,
00:01,
00:02,
etc.
final Timer timer = new Timer();
final TimerTask timerTask = new TimerTask(){
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
String timer = sdf.format(new Date(counter * 1000L));
timerText.setText(timer);
counter++;
}
});
}};
timer.schedule(timerTask, 0, 1000);
However, when I revisit the activity, the timer's interval increases. If I revisit it the first time, the interval becomes 2 i.e.
00:00,
00:02,
00:04,
etc.
Revisiting it again makes the interval 3 i.e.
00:00,
00:03,
00:06,
etc.
And the intervals keep incrementing.
I deduced the runOnUIThread method is being run n times, where n is the number of times onCreate has been accessed, but I don't really know what to do about it.

Use the Timer constructor that specifies it to be a daemon new Timer(true) so that if it exits the timer thread exits too.
Also consider cancelling the timer before exiting on onDestroy or onPause for example.

Creating a timer in java

I try to create a timer in java and show it on JFrame but when I comper my timer to my phone timer the timer in my phone is faster then my why?
I set the deley to 10 to every hundred of second in my timer.
This is the code only for the timer:
import javax.swing.Timer;
int min = 0, sec = 0, hundredSec = 0;
timer = new Timer(10, new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
hundredSec++;
if(hundredSec >= 99)
{
sec++;
hundredSec = 0;
}
if(sec >= 59)
{
min++;
sec = 0;
}
timerL.setText(String.format("%02d:%02d:%02d", min, sec, millisec));
}
});
Sorry for bad english.
Thanks in advance for answer.

I believe that your problem has to do with the third line of code. As the java API docs says: "The delay parameter is used to set both the initial delay and the delay between event firing, in milliseconds." This means that there is a 10 millisecond delay every time, which might be causing your delay. To fix that you can change the line of code to:
timer = new Timer(0, new ActionListener());
By changing 10 to 0 it would run instantly as opposed to slowly falling behind. I would recommend reading this article to learn more about timers.

The delay you pass into a Timer is just that, a delay before the event is queued, not an exact time that the event will perform. While you can be sure that 10ms have passed since the last time the call was performed, you can't be sure that ONLY 10ms have passed.
You probably want something like this (with as little change to your code as possible; there are certainly different/more optimal ways to do this):
import javax.swing.Timer;
Date dt = new Date();
timer = new Timer(10, new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
int min = 0, sec = 0, hundredSec = 0;
long millisec = (new Date()).getTime() - dt.getTime();
hundredSec = ( millisec / 10 ) % 100;
sec = ( millisec / 1000 ) % 60;
min = ( millisec / 60000 );
timerL.setText(String.format("%02d:%02d:%02d", min, sec, hundredSec));
}
});
There are a couple issues here (missing timerL declaration, and I fixed the millisec reference in the setText call), but they're the same as you had above, so I assume you're just posting a snippet.

What is wrong with my event timer loop thing?

I have a timer set up that should run code every 10th of a second, but instead it seems to run the desired code only once. I cannot figure out what I am doing wrong. :{
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
System.out.println("it only prints this once");
}
}, 100, 100000);
Thanks in advance for your help.

The last two arguments to scheduleAtFixedRate seem odd. The first one is always 0 (which is not a problem; just means that there's no delay before the first execution). The second is set to 2 minutes, not 0.1 second. The argument is supposed to be the rate in milliseconds. For 0.1 second, you should use 100, not 2*60*1000.
Try this:
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
System.out.println("it only prints this once");
}
}, 100, 100);

In Java, how do I execute code every X seconds?

I'm making a really simple snake game, and I have an object called Apple which I want to move to a random position every X seconds. So my question is, what is the easiest way to execute this code every X seconds?
apple.x = rg.nextInt(470);
apple.y = rg.nextInt(470);
Thanks.
Edit:
Well do have a timer already like this:
Timer t = new Timer(10,this);
t.start();
What it does is draw my graphic elements when the game is started, it runs this code:
#Override
public void actionPerformed(ActionEvent arg0) {
Graphics g = this.getGraphics();
Graphics e = this.getGraphics();
g.setColor(Color.black);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
e.fillRect(0, 0, this.getWidth(), this.getHeight());
ep.drawApple(e);
se.drawMe(g);

I would use an executor
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
Runnable toRun = new Runnable() {
public void run() {
System.out.println("your code...");
}
};
ScheduledFuture<?> handle = scheduler.scheduleAtFixedRate(toRun, 1, 1, TimeUnit.SECONDS);

Use a timer:
Timer timer = new Timer();
int begin = 1000; //timer starts after 1 second.
int timeinterval = 10 * 1000; //timer executes every 10 seconds.
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
//This code is executed at every interval defined by timeinterval (eg 10 seconds)
//And starts after x milliseconds defined by begin.
}
},begin, timeinterval);
Documentation: Oracle documentation Timer

Simplest thing is to use sleep.
apple.x = rg.nextInt(470);
apple.y = rg.nextInt(470);
Thread.sleep(1000);
Run the above code in loop.
This will give you an approximate(may not be exact) one second delay.

You should have some sort of game loop which is responsible for processing the game. You can trigger code to be executed within this loop every x milliseconds like so:
while(gameLoopRunning) {
if((System.currentTimeMillis() - lastExecution) >= 1000) {
// Code to move apple goes here.
lastExecution = System.currentTimeMillis();
}
}
In this example, the condition in the if statement would evaluate to true every 1000 milliseconds.