final --> for primitives --> value can't change. for non-primitives --> you can't change the reference and point it to another object. Note : It is different from immutability.
Hands down, the Bluetooth speaker with the longest battery life is the Fugoo. It offers up to 40 hours of battery life, nearly twice the battery life of other leading Bluetooth speakers in this category. Given how long its battery lasts, you might even forget that the Fugoo needs to be plugged in to charge.
This $99 speaker offers impressively rich bass, a crisp speakerphone for chatting with friends and a splashproof design that makes it safe for poolside or a rainy camp day. Factor in its 10-hour battery and a range of fun color options, and you've got one of the best overall values of any Bluetooth speaker.