You can use AJAX which allows you with the help of HTTPXMLObject and JavaScript to send data from the client to the server without the need to recreate the complete page.

This is an introduction tutorial on how to create a custom meta box for your post editor of your WordPress website.

This is a practical tutorial, where you will learn how you can create your own custom annotation types in your Java program. But also an introduction into the Java annotation package, which can be useful for you.

This is an introduction tutorial on how to create a REST API that performs CRUD operations. It can get, add, updated and delete data.