Check button-click during for-statement

hi,
I have wrote an import-function that reads out a text-file.
I want that the user of my GUI is able to stop the import by pressing an abort-button.
unfortunately, java seems not to check for button clicks during a block of code is processed.
therefore I am looking for a work around.
thanks
gammloop

Java's Thread Tutorial
JavaWorld: Introduction to Java threads
IBM: Introduction to Java threads
Google: java+threads+tutorial

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my main class calls :
LoginContext loginContext = new LoginContext("Main",
new DialogCallbackHandler());
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The only way you could test for that type of circumstance... one where something may happen... is to do so with a timeout. In other words, you cannot let the test pass simply because the first event occurred.
Two ways to handle this... with sequences:
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fail('i shouldnt be here');
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Check button-click during for-statement

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