How to retrieve image from project folder?

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Put all the images in images folder that you have in your project in parallel to src folder.

 F:/>Kiosk
             |
             |___src
             |
             |___lib
             |
             |___koisk
                   |
                   |__main1.java
             |
             |__images
                |
                |__c.jpg
                |__d.jpg
                |__e.jpg
                |__f.jpg

Use this code

list.add(resizeImage(ImageIO.read(new File("images\\c.jpg"))));
list.add(resizeImage(ImageIO.read(new File("images\\d.jpg"))));
list.add(resizeImage(ImageIO.read(new File("images\\e.jpg"))));
list.add(resizeImage(ImageIO.read(new File("images\\f.jpg"))));

— EDIT —

You can try any one

// Read from same package 
list.add(resizeImage(ImageIO.read(getClass().getResourceAsStream("c.png"))));

// Read from absolute path
list.add(resizeImage(ImageIO.read(new File("E:\\SOFTWARE\\TrainPIS\\res\\drawable\\c.png"))));

// Read from images folder parallel to src in your project
list.add(resizeImage(ImageIO.read(new File("images\\c.jpg"))));

Repeat any one for all four images.

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