![]() We need to add a SuppressWarnings to our method to fix this: 6.4. This code compiles and works, but gives us an unchecked assignment warning. ![]() In other words, this is a problem we can solve by type casting: Stream> stream = Stream.of("A", "AAA", "B", "AAB", "C") Where String isn't a subclass of Object, Optional is actually an identical runtime type to Optional. Luckily, there's a difference between this example and our previous examples. However, we'd again get a compiler error if we tried to construct our array: // compiler error filter(string -> string.startsWith("A")) There are two main ways to create linked lists in Java. We can also easily take our Stream and convert it to Stream> by using the map method: Stream> stream = Stream.of("A", "AAA", "B", "AAB", "C") It's valid to declare this sort of array: Optional strings = null ![]() Perhaps we have an API we want to call that takes Optional as its input. It is a child interface of Collection.Now let's imagine we want to convert the values in our stream into an object which itself has a type parameter, say List or Optional. I have been trying to get the string value but the function I wrote does not seem to return the string, it only returns null and I don't know what I did wrong. Array: As a circular buffer backed by an array. I have a doubly linked list class and I need to make a function called get that returns a string from a given index. Queue: Linked list: As a singly-linked list with a head and tail pointer.
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