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Hi, I would suggest you read this post How to use KNearest in java?.
To actually use it you would need a learning set for text something like this THE MNIST DATABASE of handwritten digits.
Last case is to prepare your image as a (this is for digits.png in the 1st link) thresholded 20x20 square with white digit/letter in the middle of the square.
I too struggle sometimes with lack of examples for Java. Usually the easiest is to convert Python examples.
