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.

Get a deep dive into using method references in your Java programs, including stream operations, ... User objects: User::new is a shortcut to call the User constructor for each name.

Consumer<Long> lambdaConsumer = (Long t) -> System.out.println(t*t); lambdaConsumer.accept(new Long(5)); I like to use a verbose lambda syntax when demonstrating how they work, but one of the reasons ...