Replace the brackets and commas with empty space. String formattedString = myArrayList.toString() .replace(“,”, “”) //remove the commas .replace(“[“, “”) //remove the right bracket .replace(“]”, “”) //remove the left bracket .trim(); //remove trailing spaces from partially initialized arrays
I guess (or at least it is an alternative) this way is more performant: public static IntStream baz(List<Integer> list) { return list.stream().mapToInt(Integer::intValue); } since the function Integer::intValue is fully compatible with ToIntFunction since it takes an Integer and it returns an int. No autoboxing is performed. I was also looking for an equivalent of Function::identity, … Read more
I’ve knocked up a basic version of what I’m looking for, it’s not perfect but it’ll do the job until something better comes along. public class LimitedQueue<T> : Queue<T> { public int Limit { get; set; } public LimitedQueue(int limit) : base(limit) { Limit = limit; } public new void Enqueue(T item) { while (Count … Read more
A Collection is an Iterable. So you can write: public static void main(String args[]) { List<String> list = new ArrayList<String>(); list.add(“a string”); Iterable<String> iterable = list; for (String s : iterable) { System.out.println(s); } }
Once your beanList has been initialized, you can do beanList = Collections.unmodifiableList(beanList); to make it unmodifiable. (See Immutable vs Unmodifiable collection) If you have both internal methods that should be able to modify the list, and public methods that should not allow modification, I’d suggest you do // public facing method where clients should not … Read more
Just do: map.keySet().retainAll(set); As per the javadoc, the changes in the key set are reflected back in the map. … The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. … Here’s a demo: var map = new HashMap<String, String>(); map.put(“1”, “one”); map.put(“2”, “two”); map.put(“3”, “three”); … Read more
A bit of LINQ should do it:- var myOtherList = lbMyListBox.Items.Cast<String>().ToList(); Of course you can modify the Type parameter of the Cast to whatever type you have stored in the Items property.
Easy work around is just to pass in the List into an ArrayList‘s constructor. For example: String valuesInArray[]={“1″,”2″,”3″,”4”}; List modifiableList = new ArrayList(Arrays.asList(valuesInArray)); System.out.println(modifiableList.remove(“1″) + ” remove flag”); System.out.println(” collcetion “+ modifiableList); Response: true remove flag collcetion [2, 3, 4]
You can specify that you want to use a generic list instead of an array by clicking the advanced button when you add a reference, or you can right click on the service reference and choose configure to change it in place. The reason is that WCF serializes Generic lists as arrays to send across … Read more
You can change the behaviour of ArrayList List<MyType> list = new ArrayList<MyType>() { public boolean add(MyType mt) { super.add(mt); Collections.sort(list, comparator); return true; } }; Note: a PriorityQueue is NOT a List, if you didn’t care what type of collection it was, the simplest would be to use a TreeSet, which is just like a … Read more