I’ve a two POJOs, Sample code below Controller class This returns me a list of the list: but what I want is a single list like How can I do that with Java 8 streams? I’ve tried flatMap also, but that doesn’t go well with the Object datatype of entries. Answer Consider a List<String> as a field entries in the
Tag: list
How convert JavaRDD to JavaRDD<List>?
JavaRDD<List> documents = StopWordsRemover.Execute(lemmatizedTwits).toJavaRDD().map(new Function<Row, List>() { @Override public List call(…
trouble initialize List Using Arrays.asList
When I initialize List, I am able to do this: List foo = new ArrayList(); foo.add(new Object[]{816, “foo”, 2.6}); But when I want to simplify it using Arrays.asList: List<…
How to [flat] merge Merge Multiple Arrays into List in Java
How can I [flat] merge multiple arrays into a single List? For example: private String title[] = { “Cup Cake”, “Donut”, “Eclair”, “Froyo”, …
How to get Cartesian product from multiple lists?
Say I have several List<T>s, I will put them into another list or other collections, so I don’t know how many list<T> I have until I call List<List<T>>.size() Take below List<Integer> as an example: How can I get the result of list1*list2*list3*…listn as a Cartesian product? For example: should be: Answer You can use recursion to achieve it, your base
Incompatible types List of List and ArrayList of ArrayList
The below line gives me error : What is the reason? EDIT I understand if I change my second ArrayList to List, it does not give me error. I want to know the reason of error though. Thanks Answer If you had a List<List<Integer>> then you’d be able to add a LinkedList<Integer> to it. But you can’t do this for
Java 8: merge lists with stream API
I have the following situation Map
Jackson read json in generic List
I’m using Jackson in order to read json messages. One of the values that I’ trying to parse is a List and another value contains the type of the data in the list. This is the structure i ‘ve created in java. Through Class.forName(); I can get the class which represents the data in the list. The question is how
Find substring in List and return Index Number
I have an List, with Strings like: String One String Two String Three Now i would like to get the Index Number for the Substring “One”. How can i get this? I only could make it if i convert it to an …
hasPrevious() Method not working
I don’t understand why my hasPrevious iterator is not functioning, it looks like this: public void previousSong(){ Iterator