File format validation and text field validation in java swings

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File format validation and text field validation in java swings

i am reading a jpg image file throuh jfilechooser in java swings,when we press browse button for selecting file it will display filechooser in this process when we select a file other than jpg file we have to display dialog box message 'please select jpg file only' plz give me the code in swings. Please.

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