One way to convert a list to an array is shown below: List list = Arrays.asList(1, 2, 3);Integer[] array = new Integer[list.size()];array = list.toArray(array);
Query methods defined in repositories can be executed asynchronously. This means that the query method will return immediately upon invocation. The sample code below relies on @Async annotation and Future,
In order to selectively expose CRUD operations, we need to define an intermediate interface, annotated as below: @NoRepositoryBeaninterface IntermediateRepository extends Repository { // add here the selected CRUD, for example
For defining a SynchronousQueue in Java, we need the BlockingQueue interface as follows: BlockingQueue queue = new SynchronousQueue();
Converting List to Set: List list = Arrays.asList(1, 2, 3);Set set = new HashSet(list); Converting Set to List: Set set = Sets.newHashSet(1, 2, 3);List list = new ArrayList(set);
The quickest solution for sorting an array in Java relies on Arrays.sort() method as below: int[] arr = {5, 12, 3, 44, 55}; Arrays.sort(arr);
Consider a Review object with three properties: article, book and magazine. Let’s assume that only one of these three properties should be set as non-null. For checking this constraint we
The best way to declare a Pattern in Java is as a constant, since Pattern is immutable. Use the following code: private static final Pattern PATTERN = Pattern.compile(” +”); Further,
If we have a code-point, we can check if it is a Unicode surrogate pair as follows: int cp = some_code_point;if(Character.charCount(cp) == 2) { // 2 means a surrogate pair