Everyone who has been and will be working on the Java language will know the concepts of JDK, JRE and JVM. So do people know what they are and the difference between them? In this tutorial, I will make clear to everyone to have a… Read More
After deploying our application, to deploy the application to Cloud Foundry, we can use the Push command with the Cloud Foundry CLI. In this tutorial, I will guide you how to use Push command in the Cloud Foundry. The main steps for deploying our application… Read More
I have shown you how to use JPA in the Spring framework in the previous tutorial. In this tutorial, I will continue to guide you all using JPA in Spring MVC. First, I will also create a Maven project as an example: If someone does… Read More
Function interface is used to convert data from input parameters to return results in a different format. To do this, we will implement the apply() abstract method defined in the Function interface. But first, let’s look at the contents of the Function interface.
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package java.util.function; import java.util.Objects; /** * Represents a function that accepts one argument and produces a result. * * <p>This is a <a href="package-summary.html">functional interface</a> * whose functional method is {@link #apply(Object)}. * * @param <T> the type of the input to the function * @param <R> the type of the result of the function * * @since 1.8 */ @FunctionalInterface public interface Function<T, R> { /** * Applies this function to the given argument. * * @param t the function argument * @return the function result */ R apply(T t); /** * Returns a composed function that first applies the {@code before} * function to its input, and then applies this function to the result. * If evaluation of either function throws an exception, it is relayed to * the caller of the composed function. * * @param <V> the type of input to the {@code before} function, and to the * composed function * @param before the function to apply before this function is applied * @return a composed function that first applies the {@code before} * function and then applies this function * @throws NullPointerException if before is null * * @see #andThen(Function) */ default <V> Function<V, R> compose(Function<? super V, ? extends T> before) { Objects.requireNonNull(before); return (V v) -> apply(before.apply(v)); } /** * Returns a composed function that first applies this function to * its input, and then applies the {@code after} function to the result. * If evaluation of either function throws an exception, it is relayed to * the caller of the composed function. * * @param <V> the type of output of the {@code after} function, and of the * composed function * @param after the function to apply after this function is applied * @return a composed function that first applies this function and then * applies the {@code after} function * @throws NullPointerException if after is null * * @see #compose(Function) */ default <V> Function<T, V> andThen(Function<? super R, ? extends V> after) { Objects.requireNonNull(after); return (T t) -> after.apply(apply(t)); } /** * Returns a function that always returns its input argument. * * @param <T> the type of the input and output objects to the function * @return a function that always returns its input argument */ static <T> Function<T, T> identity() { return t -> t; } } |
We… Read More
I have instructed you how to install Jenkins in Linux and using Docker. There is another way that we can install Jenkins that is using the war file. How is it in details? Let’s find out in this tutorial. There are two things that we… Read More
Jenkins is a tool that makes it easy to build source code for software projects. In this tutorial, I will guide you to install Jenkins on Ubuntu and will have some instructions about it in the incoming tutorials. To install Jenkins, you need to install… Read More
The equals() and hashCode() methods are very important for all objects in Java. In this tutorial, I will present to you all the basic knowledge about these two methods. By default, these methods are defined in Object objects, which are the parent objects of all… Read More
This method was introduced from Java 9. Here we have two overload methods delayedExecutor(), the first method has the following syntax:
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static Executor delayedExecutor(long delay, TimeUnit unit) |
This method returns an Executor object from the default Executor object that the CompletableFuture object uses to execute the task, after the delay.… Read More
Compare plugin in Notepad++ is a plugin that allows us to compare any two files that are opened in Notepad++, to see the difference between them clearly. In this tutorial, I will guide you how to install and use the basic with this plugin. Installation… Read More
This method was introduced from Java 9.
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CompletableFuture<T> completeOnTimeout(T value, long timeout, TimeUnit unit) |
This method is used to: if after a timeout period our task is still unfinished, instead of throwing out the TimeoutException exception like the orTimeout() method, our code will return the value that we passed in this method.… Read More
