Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

Copying objects is a common Java programming operation that has one serious trap. Here's how to avoid copying from an object reference and only copy the instance and values you want.

Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.

This example represents a JPEG file saved with "mypic" as its name, stored in the Pictures directory on the user's SD card. Create a Bitmap object. Declare a Bitmap object for your loaded image.