One of the best examples is in your hand, yes, Android Smartphone, the application Chrome/UC/Opera is built in Java. I am not sure if they have switched to Kotlin or not but Java used to be the Primary language to code Android applications.
If you know deep concepts of java then you can also use the language to make backend of web pages with the help of Java Applets. Desktop applications such as in banking, finance, the stock market, big data, Space exploration, oil rigs etc., uses Java Programming language.
Smart Televisions which have an Android operating system installed can use applications coded in Java Programming language. In any system language is not a barrier, one should be good enough to code for it.