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2. How to make a new List in Java - Stack Overflow

   stackoverflow.com/questions/858572

   In case we are using Java 9 then: List<String> list = List.of("A", "B"); Java 10. In case we are at Java 10 then the method Collectors.unmodifiableList will return an instance of truly unmodifiable list introduced in Java 9.

3. loops - Ways to iterate over a list in Java - Stack Overflow

   stackoverflow.com/questions/18410035

   The three forms of looping are nearly identical. The enhanced for loop:. for (E element : list) { . . . } is, according to the Java Language Specification, identical in effect to the explicit use of an iterator with a traditional for loop.

4. How can I read all files in a folder from Java? - Stack Overflow

   stackoverflow.com/questions/1844688

   Simple example that works with Java 1.7 to recursively list files in directories specified on the command ...

5. java - What is the difference between List.of and Arrays.asList...

   stackoverflow.com/questions/46579074

   I'm not a Java developer, so take it as a casual observation. There's possibly a good reason for the behavior to differ, but if I had a method returning a List<Integer> like the example, the interface wouldn't be sufficient for me to know if I'll get a runtime exception if I check it for nulls.

6. How to print out all the elements of a List in Java?

   stackoverflow.com/questions/10168066

   System.out.println(list) should print all the standard java object types (String, Long, Integer etc). In case, if we are using custom object types, then we need to override toString() method of our custom object.

7. Java Generics: List, List<Object>, List<?> - Stack Overflow

   stackoverflow.com/questions/490091

   List, List<?>, and List<? extends Object> are the same thing. The second is more explicit. The second is more explicit. For a list of this type, you cannot know what types are legal to put into it, and you don't know anything about the types you can get out of it, except that they will be objects.

8. Choosing the best concurrency list in Java - Stack Overflow

   stackoverflow.com/questions/8203864

   You might want to look at ConcurrentDoublyLinkedList written by Doug Lea based on Paul Martin's "A Practical Lock-Free Doubly-Linked List". It does not implement the java.util.List interface, but offers most methods you would use in a List. According to the javadoc: A concurrent linked-list implementation of a Deque (double-ended queue).

9. Java: convert List<String> to a join ()d String - Stack Overflow

   stackoverflow.com/questions/1751844

   Yes, it is thread safe. The only state saved in a joiner is the separator (which is final).Everything that I've seen in Guava, where I used to use an Apache Commons equivalent has been so much better (read: cleaner, faster, safer and just more robust in general) in Guava with fewer edge case failures and thread safety issues and smaller memory footprint.

10. java - Check if a value exists in ArrayList - Stack Overflow

    stackoverflow.com/questions/4404084

    Java docs for HashSet says This class offers constant time performance for the basic operations (add, remove, contains and size) ArrayList.contains() might have to iterate the whole list to find the instance you are looking for.

11. Convert list to array in Java - Stack Overflow

    stackoverflow.com/questions/9572795

    For sure the list does not fit into the passed array new Foo[0] (unless the list itself is empty), and a new array will be created for holding the list items. You are just passing the type of the array (while the object itself is useless).