how to take a document file as an input from the user interface in java

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Java

JSF

Hello, I am making a Java project that takes a docx file as an input and generates its image and then save it as a PDF file.
i.e. .docx -> .JPG -> .PDF

While coding the first part i.e .docx -> .jpg , here is my code but I am specifying the path of my document, but I want to ask how to make it possible so that the user can specify the document path.
here is my code

import com.aspose.words.Document;
import com.aspose.words.ImageSaveOptions;
import com.aspose.words.SaveFormat;


public class Program {


    public static void main(String args[]) throws Exception {


        new Program().generateImages("E:\\pro2\\Document.docx"); // here i am specifying the path of the document file within code itself
    }

    public void generateImages(final String sourcePath) {
        try {
            Document doc = new Document(sourcePath);
            ImageSaveOptions options = new ImageSaveOptions(SaveFormat.JPEG);
            options.setJpegQuality(100);
            options.setResolution(100);

            for (int i = 0; i < doc.getPageCount(); i++) {
                String imageFilePath = sourcePath + "_outputimg_" + i + ".jpg";
                options.setPageIndex(i);
                doc.save(imageFilePath, options);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Please tell me how to make GUI where user can select location of the .docx file.