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This tutorial explains the key differences between Map and in Java HashMap . In Java, Map is an interface for storing data in key-value pairs, and HashMap is Map an implementation class of the interface. Java has several classes ( TreeHashM...

This article explains how to use the two methods contained in the HashMap class in Java - update put() and replace() update the values ​​in a HashMap. hashmap.put() Update the value in Hashmap in Java using When we want to HashMap inser...

This tutorial explains how to print HashMap an element in Java and also provides some sample code to understand the topic. HashMap It is Map an implementation class of the interface and is used to collect elements into key and value pairs....

This tutorial explains how to Mapkey, value sort pairs by value in Java and lists some sample codes to understand it. There are several ways to Map sort . Here we use sort() the , sorted() method, and Comparator interface. Let's look at an...

This article explains how to convert a Hashmap to a JSON object in Java. We will see a detailed example of creating a hashmap and then converting it to a JSON object. Hashmap and JSON are both very commonly used by developers as they help u...

This tutorial explains how to create program delays in Java and gives some sample code to understand it. There are several ways to create a time delay, such as TimeUnit.sleep() ,, ScheduleAtFixedRate() etc. Thread.sleep() Let's look at an e...

This article explains how to use enum in Java . We will use statement switch with enum in two ways . switch In Java, we use traditional switch and case to perform enumeration operations. switch In this example, we SwitchEnum create an enume...

This article shows the steps to update the PHP version from 7.x version to 7.4 in CentOS. How to Update PHP from 7.X to 7.4 in CentOS Update operating system packages. yum update -y Check your PHP version in CentOS. php -v Prints a list of...

PHP has one of the best encryption functions for data security. Hash_hmac() The encrypt function is one of the most famous encryptors. We'll show you how to use hash_hmac and sha256 encryptors to create 安全签名 one that you can store i...

We can upload images in PHP using simple file upload operation, but first, php.ini file upload should be enabled from Files. This tutorial demonstrates how to upload images in PHP. php.ini Enable file upload from file in PHP to upload image...

In this tutorial article, we will discuss about resizing images in PHP. Load the image before resizing Before we can resize an image, we must first load it as an image resource in our script. This is file_get_contents() different from using...

Different tasks may require running multiple versions of PHP. You may need to switch PHP versions by running two sites on the same server or testing older versions of code using outdated methods. We can switch PHP versions on Ubuntu using t...

Let's say you're in a login form and you enter the wrong information; in this case, you probably want to go back to the login page. PHP has a built-in function header() to redirect a page to a specific page. But what if the login page is at...

This article shows you how to div id store a in a PHP variable and pass it to JavaScript code. We will answer the following questions. What is div id ? How to div id store in a PHP variable? How to pass variables to JavaScript code? Let’s...

We will use PHP and ajax by printing a simple sum of two numbers 2 and . Also, print a php array in JSON. 3 object We will also use PHP with ajax by getting the HTML formatted output from the number division in PHP. Printing simple addition...