The java.lang.Math package is very powerful. Understand more methods in this package that are related to the Euler’s number named e. public class MathMethods{ public static void main(String args[]) { MathMethods
For triggering a synchronous GET request we can rely on HTTP Client API as follows: HttpClient client = HttpClient.newHttpClient();HttpRequest request = HttpRequest.newBuilder() .uri(URI.create(“https://reqres.in/api/users/2”)) .build();HttpResponse response = client.send(request, BodyHandlers.ofString());
To avoid null exceptions, we usually validate against null and emptiness as shown: if(object != null && !object.equals(“”)) {} We can simplify this as below: if(!””.equals(object)){}
The following code shows you how to compute the n Fibonacci number recursively: int fibonacci(int k) { if (k return k; } return fibonacci(k – 2) + fibonacci(k – 1);}
Automation of tasks is a good concept. Consider the example below in which you create a task and schedule it at your convenience to execute the needed actions. There are
Java arrays are not resizable. But we can work around this constraint with the following trick. int[] newArr = Arrays.copyOf(arr, arr.length + 1);
You can terminate the Java runtime that you are in programmatically. The Java Runtime class provides a method halt(argument) to support this. Of course, caution is advised when using this
With the Java Reflection API, we can isolate the abstract methods from a class via the following snippet of code: List abstractMethods = new ArrayList();Class clazz = Foo.class;Method[] methods =
Knowing the current flush mode can be done as follows: // via EntityManagerentityManager.getFlushMode();// in Hibernate JPA, via Session(entityManager.unwrap(Session.class)).getFlushMode();// starting with Hibernate 5.2(entityManager.unwrap(Session.class)).getHibernateFlushMode();