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From: Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: What do you think of my CropImage class
Date: Thu, 21 Jul 2016 07:58:44 -0700
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On 7/21/2016 03:05, Cecil Westerhof wrote:
>
>> Runnable r = new Runnable() {
>> public void run() {
>> try {
>> ImageIO.write(subImage,"JPEG",new
>> File("crop.jpg"));
>> } catch (IOException ioe) {
>> ioe.printStackTrace();
>> }
>> }
>> };
>> new Thread(r).start();
>
> Why are you doing this in a separate thread?
>

So if you have a large image that takes a second or two to write it 
won't block the Event Dispatch Thread and mess up the mouse movement.

-- 

Knute Johnson