Fredy  Larson

Fredy Larson

1602319808

How to Parse JSON & XML Using the Same Code in Java

Supporting multiple formats like XML (Extensible Markup Language) and JSON (JavaScript Object Notation) usually means multiple implementations that deal with serializing and deserializing data. Fortunately, it’s possible to do it using the same code.

In this article, you’ll learn how to do it in Java by using dataformat-xml — Jackson library extension in such a way that you only need to write your code once. We’ll go through the main features including model definition, custom serialization, and deserialization. Finally, I’ll share a tricky use-case where our “one to rule them all code” won’t work and explain why.

Project setup

We’ll use a simple Maven project. In the pom.xml build section, there is a maven-compiler-plugin configured to use Java 11. We’ll also need jackson-dataformat-xml dependency.

<?xml version="1.0" encoding="UTF-8"?>
	<project xmlns="http://maven.apache.org/POM/4.0.0"
	         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	    <modelVersion>4.0.0</modelVersion>

	    <groupId>rauluka</groupId>
	    <artifactId>xml-json-one-code</artifactId>
	    <version>1.0-SNAPSHOT</version>

	    <properties>
	        <maven.compiler.release>11</maven.compiler.release>
	    </properties>

	    <dependencies>
	        <dependency>
	            <groupId>com.fasterxml.jackson.dataformat</groupId>
	            <artifactId>jackson-dataformat-xml</artifactId>
	            <version>2.11.2</version>
	        </dependency>
	    </dependencies>

	    <build>
	    <pluginManagement>
	        <plugins>
	            <plugin>
	                <groupId>org.apache.maven.plugins</groupId>
	                <artifactId>maven-compiler-plugin</artifactId>
	                <version>3.8.1</version>
	            </plugin>
	        </plugins>
	    </pluginManagement>
	    </build>
	</project>

Maven pom.xml file (gist by Author).

#code #coding #java #technology #programming

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How to Parse JSON & XML Using the Same Code in Java
Samanta  Moore

Samanta Moore

1621137960

Guidelines for Java Code Reviews

Get a jump-start on your next code review session with this list.

Having another pair of eyes scan your code is always useful and helps you spot mistakes before you break production. You need not be an expert to review someone’s code. Some experience with the programming language and a review checklist should help you get started. We’ve put together a list of things you should keep in mind when you’re reviewing Java code. Read on!

1. Follow Java Code Conventions

2. Replace Imperative Code With Lambdas and Streams

3. Beware of the NullPointerException

4. Directly Assigning References From Client Code to a Field

5. Handle Exceptions With Care

#java #code quality #java tutorial #code analysis #code reviews #code review tips #code analysis tools #java tutorial for beginners #java code review

Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Autumn  Blick

Autumn Blick

1593251880

JSON Parsing in Android - Step by Step Implementation

JSON Structures in Android

JSON uses two types of brackets that are as follows:

  • [] – To declare the elements of Array in JSON, they’re written in square brackets.
  • {} – To create JSON objects, the elements are written in curly brackets.

JSON has the following types of structures that are:

1. JSON Objects

The elements inside the curly brackets are known as Objects.

2. JSON Array

A list of values, known as Arrays.

3. JSON Key-Value

This data is stored as a pair of keys and values. Here the keys can be a name, a number for which the values can be Seema, 98767586 etc.

Why JSON Parsing in Android over XML?

Let us see some reasons for why to choose JSON over XML:

  • It is much easier and quicker with high performance
  • It can use arrays
  • Its libraries do not depend on other libraries
  • The codes written in JSON are short, clean and easy to understand
  • It is free to open use and open-source tool
  • In JSON value retrieval is easy
  • It has a fully automated way of serializing/deserializing JavaScript.
  • It is supported by many Ajax toolkits and most of the backend technologies.

Examples of XML and JSON

Let us see the code difference of JSON and XML files:

XML Example:

<?xml version= “1.0” encoding= “” ?>
<student>
        <student>
  <name> Sia Sharma</name>
  <city> Chandigarh</city>
         </student>
        <student>
  <name>Dimple D’souza</name>
  <city> Nagpur</city>
         </student>
      <student>
  <name>Anna Jones</name>
  <city> Mumbai</city>
         </student>
  </student>

JSON Example:

{ “students”: [
{ “name”: “Sia Sharma”, “city”: “Chandigarh”},
{ “name”: “Prachi D’Souza”, “city”: “Nagpur”},
{ “name”: “Annas Jones”, “city”: “Mumbai”}
]}

I hope the difference is all clear in front of you. This is how simple JSON is and how easily it could be understood.

#android tutorials #json parsing in android #json parsing in android example #json parsing in android step by step #json parsing with android #read json file android

Samanta  Moore

Samanta Moore

1624955940

12 Common Java Mistakes Made by Newcomers

Everyone makes mistakes, not just beginners, but even professionals. This article goes over a dozen common mistakes that Java newbies and newcomers make and how to avoid them. Have you or your colleagues made any of these common Java mistakes early in your career?

Everyone makes mistakes, not only learners or beginners but professionals. As a programming course, the CodeGym team often collects mistakes of newbies to improve our auto validator. This time we decided to interview experienced programmers about mistakes in Java they made closer to their careers start or noticed them among their young colleagues.

We collected their answers and compiled this list of dozen popular mistakes Java beginners make. The order of errors is random and does not carry any special meaning.

#java #learn-java #java-programming #beginners #beginners-to-coding #learning-to-code #learn-to-code #learn-to-code-java

Fredy  Larson

Fredy Larson

1602319808

How to Parse JSON & XML Using the Same Code in Java

Supporting multiple formats like XML (Extensible Markup Language) and JSON (JavaScript Object Notation) usually means multiple implementations that deal with serializing and deserializing data. Fortunately, it’s possible to do it using the same code.

In this article, you’ll learn how to do it in Java by using dataformat-xml — Jackson library extension in such a way that you only need to write your code once. We’ll go through the main features including model definition, custom serialization, and deserialization. Finally, I’ll share a tricky use-case where our “one to rule them all code” won’t work and explain why.

Project setup

We’ll use a simple Maven project. In the pom.xml build section, there is a maven-compiler-plugin configured to use Java 11. We’ll also need jackson-dataformat-xml dependency.

<?xml version="1.0" encoding="UTF-8"?>
	<project xmlns="http://maven.apache.org/POM/4.0.0"
	         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	    <modelVersion>4.0.0</modelVersion>

	    <groupId>rauluka</groupId>
	    <artifactId>xml-json-one-code</artifactId>
	    <version>1.0-SNAPSHOT</version>

	    <properties>
	        <maven.compiler.release>11</maven.compiler.release>
	    </properties>

	    <dependencies>
	        <dependency>
	            <groupId>com.fasterxml.jackson.dataformat</groupId>
	            <artifactId>jackson-dataformat-xml</artifactId>
	            <version>2.11.2</version>
	        </dependency>
	    </dependencies>

	    <build>
	    <pluginManagement>
	        <plugins>
	            <plugin>
	                <groupId>org.apache.maven.plugins</groupId>
	                <artifactId>maven-compiler-plugin</artifactId>
	                <version>3.8.1</version>
	            </plugin>
	        </plugins>
	    </pluginManagement>
	    </build>
	</project>

Maven pom.xml file (gist by Author).

#code #coding #java #technology #programming