Programming VIP

preface Hi, Hello, I'm Milo. I'm back 🙈 Come in and gossip for everyone and see what I've done myself? Recently, the company received a new project of agricultural products trading website. Because of a code reconstruction problem, it almost got into trouble with the boss. I thought it was the boss who deliberately made trouble for me. ...

preface In the process of daily project development, I believe everyone must often encounter the scene of time formatting. Many people may feel very simple, but is your time formatting method really elegant and efficient? 1, Common time formatting methods public static void main(String[] args) { Date now = new Date(); // Create ...

Combinatorial asynchronous programming: completable future 1, Future interface Using the example in the following code, submit a code that takes 5000ms to execute to the thread pool, and then immediately execute and print other code No blocking will be received. When the get() method of future is executed, the code will be blocked and wait fo ...

Hello, I'm glacier~~To be honest, this article took me a month. All the new features of Java 8 are here. I suggest collecting them first and reading them later.What are the new features of Java 8?Simply put, the new features of Java 8 are as follows:Lambda expressionFunctional interfaceMethod reference and constructor referenceStream APIInterfa ...

introduction When using the collection ArrayList, you often use add, remove, etc. there are many others you haven't used or even heard of Now in this tutorial, simply understand it. You don't need to write it all down It's equivalent to building an index in your head, that is, when some methods are used, don't build wheels repeatedly The Arr ...

1. Behavior parameterization   The shaded area can be calculated by ∫ sinxdx at (0, Π) The points obtained on the are reflected in the code:              integrate(F(x), 0, pi);              integrate(-cos(x), 0, pi); Or, if we want to calculate the cosine integral, we need to transfer:              integrate(sin(x), 0, pi); Of ...

catalogue 1, Supplier interface 1. Use Supplier directly 2. Use Supplier to generate objects 3. Take Supplier as the parameter of the method 2, Consumer interface 1. Use the Consumer object directly 2. Consumer as parameter 3. Use Consumer as the parameter 3, Predict interface 1. test() method demonstration 2. Default method and() 3 ...

After the release of java8, several new methods have been added to the map class library. Using these new methods can more easily manipulate the data in the map New methods include: getOrDefault，forEach，compute，computeIfAbsent，computeIfPresent，merge，putIfAbsent，remove(key,value)，replace，replaceAll getOrDefault The getOrDefault() m ...

Four built-in core functional interfaces in Java 8 Consumer < T >: consumer interface void accept(T t); Supplier < T >: supply type interface T get(); Function < T, R >: functional interface R apply(T t); Predicate < T >: predicate interface boolean test(T t); Create Stream 1. steam() or parallelStr ...