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.
JBL Charge 2. JBL has a long history of producing great-sounding speakers, including several wonderful Bluetooth models. The JBL Charge 2 is the best one yet For such a small speaker (itâs similar in size and weight to the UE Boom), it has extremely accurate sound, and the clarity of the mix is impressive.