6- Interrupting a Thread

Jul 03, 2026 14:42 · 2:54 · English · Whisper Turbo · 2 Àwọn Àkọ́lé

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Quite often when dealing with long -lived tasks,

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we want to give our users the ability to cancel.

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So here we are starting a download task.

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I want to cancel this after one second.

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First,

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we go back to our download file task.

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Instead of pausing this thread to simulate a long -running task,

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let's add a for loop that continuously print a message on the terminal.

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So for I equals zero

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as long as it's less than integer that max value.

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I want a really large number so we can see this task going for a little while.

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I++ and here we print downloading

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byte i.

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With this we can easily verify if our download actually

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gets cancelled.

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Now,

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back to our demo class.

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I want to cancel this thread after one second.

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So,

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let's pause the current thread for one second.

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That is thread .sleep 1000.

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Just like before we should handle the interrupted exception here

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So we're starting a separate thread to download a file and then

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have the current thread that is the main thread that is executing this code wait for

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one second now to cancel the download thread here

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we call thread dot interrupt Let's

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run our program So our download

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is going and going and going.

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How come it's not stopping?

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Let me stop the program first.

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All right.

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The reason our download thread didn't stop is that calling the interrupt method

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doesn't actually force the thread to stop.

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It simply sends an interrupt request to the thread.

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It's up to that thread to decide if it should stop what it's doing.

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So back to our download file task class.

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Here we should continuously check for an interrupt request.

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If you get that request,

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then we'll have to stop the download.

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So in this for loop,

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let's add a code block.

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First we check for an interrupt request.

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So we type if thread that current

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thread we get access to the current thread and then call is Interrupted

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if this returns true,

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then we can break out of this loop or simply return

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Otherwise,

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we're going to download the byte now.

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Let's run our program again So after

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one second our download stopped

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So remember the interrupt method doesn't force a threat to stop what it's

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doing It simply sends an interrupt request to support interruption

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We should constantly check for the interrupted requests and act accordingly Now

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if a threat is sleeping and we send an interrupt request to it,

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it throws an exception That is why you have

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to handle this interrupted exception when pausing a threat

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