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如何在 Binarium 中注册和验证帐户

Michael Zippo 11.03.2022

How to setup IKEv2 VPN on Windows 10

Here you will find a detailed guide for setting up VPN connection by IKEv2 protocol on Windows 10 operating system. All you need is to repeat the following steps in your system. Simply complete all the actions as shown in the pictures.

如何在 Bash 腳本中激活 virtualenv

Michael Zippo

Michael Zippo 11.03.2022

如何創建 Bash 腳本來激活 Python virtualenv?

但是,從 Bash 腳本中執行相同操作沒有任何作用:

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如何在java中反转数组

If you have a few years of experience in the Java ecosystem, and you're interested in sharing that experience with the community (and getting paid for your work of course), have a look at the "Write for Us" page. Cheers, Eugen

1. Overview

In this quick article, we'll show how we can invert an array in Java.

We'll see a few different ways to do this using pure Java 8-based solutions – some of those mutate an existing array and some create a new one.

Next, we'll look at two solutions using external libraries — one using Apache Commons Lang and one using Google Guava.

2. Defining the Problem

The basic idea is to reverse the order of the elements in the array. So, if given the array:

We'd like to get:

Let's see some ways we can do that.

3. Using a Traditional for Loop

The first way we might think about to invert an array is by using a for loop:

As we can see, the code iterates through half of the array, changing the 如何在 Binarium 中注册和验证帐户 elements in symmetric positions.

We use a temporary variable so that we don't lose 如何在 Binarium 中注册和验证帐户 the value of the current position of the array during the iteration.

4. Using Java 8 Stream API

We can also invert an array by using the Stream API:

Here we use the method IntStream.range to generate a sequential stream of numbers. Then we map this sequence 如何在 Binarium 中注册和验证帐户 into array indexes in descending order.

5. Using Collections.reverse()

Let's see how to invert an array using the Collections.reverse() method:

Compared with the previous examples, this is a more readable way to do the task.

6. Using Apache Commons Lang

Another option to invert an array is to use the Apache Commons Lang library. To use it, we must first include the library as a dependency:

The latest version of Commons Lang can be found at Maven Central.

Let's use the ArrayUtils class to invert the array:

As we can see, this solution is quite simple.

7. Using Google Guava

One more option is to use 如何在 Binarium 中注册和验证帐户 the Google Guava library. Just as we did with the Commons Lang, we'll include the library as a dependency:

The latest version can be found at Maven Central.

Then, we 如何在 Binarium 中注册和验证帐户 can use the reverse method in Guava's Lists class to invert the array:

8. Conclusion

In this article, we looked at several different ways to invert an array in Java. We showed a few solutions using only core Java and two other solutions that use third-party libraries — Commons Lang and Guava.

All the code samples shown here can be found on GitHub 如何在 Binarium 中注册和验证帐户 — this is a Maven project, so it should be easy to import and run as it is.

How to setup IKEv2 VPN on Mac OS X

IKEv2 protocol is a part of IPsec protocol suite and is used to create a reliably protected VPN connection. Distinctive feature of IKEv2 is the ability to automatically reestablish VPN tunnel connection in case of a temporary VPN disconnect which is a useful feature for mobile users. Another IKEv2 advantages are an easy setup process and no need to use additional software.

Use our guide to quickly setup VPN connection with IKEv2 protocol on your Macbook or iMac and you will be able to use Internet anonymously and protect your data from hackers' interception while using public Wi-Fi hotspots.