Samanta  Moore

Samanta Moore

1622869440

Easy Java Swing exercise: Tip calculator

Single-purpose calculators are frequently used as exercises for Java beginners. The instructor tasks the students with writing a command line program that calculates the area of a room in square feet, or it calculates body mass index (BMI), or it converts an amount of money in one currency to another, etc.

To do the same thing with a graphical user interface (GUI), such as with Java Swing, would be too difficult for a Java beginner, because there is a lot more overhead. Or is it? After all, the three major integrated development environments (IDEs) include GUI form designers.

In this tutorial, I will walk you through the process of making a simple tip calculator with Java Swing.

We could prototype this in HTML with CSS and JavaScript (which, as you might know, is not the scripting edition of Java). A tip calculator for a Web browser is actually a trivially simple project.

To use Java Swing for this tip calculator project might seem like overkill. But for anything slightly more involved, JavaScript’s sloppy type system can be a hindrance rather than a help.

There are a few concepts in common between the Java and JavaScript versions of this project. If nothing else, the concept of event listeners is a concept in common. There’s also some kind of document object model in both.

An event listener watches out for a specific kind of event and creates an event object whenever that event occurs. We’re not talking about a big event, like a wedding or a concert, but a small event that occurs in your computer or similar device.

For example, if you move your mouse even just a little bit, that’s an event. If you scroll down a little bit on this page, that’s also an event (an event that I hope occurs again and again, but gradually, until you have read this whole article).

The big difference between the Java and the JavaScript versions of this project is that in Java both the event listeners and the event objects are well defined according to clearly documented types.

I’m going to use Apache NetBeans for my Java IDE. Both Eclipse and IntelliJ IDEA have form designers. They look different from the NetBeans form designer, but they accomplish the same goal of giving you a WYSIWYG experience for designing forms. Connecting the generated forms to your “handwritten code” follows the same principles of Java.

#java #gui #tip-calculator #java-swing

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Easy Java Swing exercise: Tip calculator
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

Samanta  Moore

Samanta Moore

1622869440

Easy Java Swing exercise: Tip calculator

Single-purpose calculators are frequently used as exercises for Java beginners. The instructor tasks the students with writing a command line program that calculates the area of a room in square feet, or it calculates body mass index (BMI), or it converts an amount of money in one currency to another, etc.

To do the same thing with a graphical user interface (GUI), such as with Java Swing, would be too difficult for a Java beginner, because there is a lot more overhead. Or is it? After all, the three major integrated development environments (IDEs) include GUI form designers.

In this tutorial, I will walk you through the process of making a simple tip calculator with Java Swing.

We could prototype this in HTML with CSS and JavaScript (which, as you might know, is not the scripting edition of Java). A tip calculator for a Web browser is actually a trivially simple project.

To use Java Swing for this tip calculator project might seem like overkill. But for anything slightly more involved, JavaScript’s sloppy type system can be a hindrance rather than a help.

There are a few concepts in common between the Java and JavaScript versions of this project. If nothing else, the concept of event listeners is a concept in common. There’s also some kind of document object model in both.

An event listener watches out for a specific kind of event and creates an event object whenever that event occurs. We’re not talking about a big event, like a wedding or a concert, but a small event that occurs in your computer or similar device.

For example, if you move your mouse even just a little bit, that’s an event. If you scroll down a little bit on this page, that’s also an event (an event that I hope occurs again and again, but gradually, until you have read this whole article).

The big difference between the Java and the JavaScript versions of this project is that in Java both the event listeners and the event objects are well defined according to clearly documented types.

I’m going to use Apache NetBeans for my Java IDE. Both Eclipse and IntelliJ IDEA have form designers. They look different from the NetBeans form designer, but they accomplish the same goal of giving you a WYSIWYG experience for designing forms. Connecting the generated forms to your “handwritten code” follows the same principles of Java.

#java #gui #tip-calculator #java-swing

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Ray  Patel

Ray Patel

1619518440

top 30 Python Tips and Tricks for Beginners

Welcome to my Blog , In this article, you are going to learn the top 10 python tips and tricks.

1) swap two numbers.

2) Reversing a string in Python.

3) Create a single string from all the elements in list.

4) Chaining Of Comparison Operators.

5) Print The File Path Of Imported Modules.

6) Return Multiple Values From Functions.

7) Find The Most Frequent Value In A List.

8) Check The Memory Usage Of An Object.

#python #python hacks tricks #python learning tips #python programming tricks #python tips #python tips and tricks #python tips and tricks advanced #python tips and tricks for beginners #python tips tricks and techniques #python tutorial #tips and tricks in python #tips to learn python #top 30 python tips and tricks for beginners

Seamus  Quitzon

Seamus Quitzon

1602637135

Learning by Doing: How to Learn Java Basics by Building Your Own Project

Java is not the hardest language to start with. So, it becomes way popular among novice developers joining the ranks of Java coders every single day. If you are reading this blog post, you might be interested in learning Java.

Java is widely used across industry, and especially in the area of Enterprise software, which results in many high paying job opportunities and makes this programming language a common language for newbies. A general promotion of it within colleges and other institutions providing a formal Computer Science education also contributes to its popularity.

However, these are not the only advantages of Java — among other things, it allows you to adopt good practices and makes it way easier to learn other languages in the future. And with no doubt, you can easily learn it if you’re following the right approach. In this post, I am going to share some of them with you.

The Importance of Practice in Programming

Beyond all doubt, practice is important and valuable. But, before we get to the advantages of hands-on experience, I want to draw your attention to one essential thing I often tell my students.

New programmers who are just learning and start implementing things, without being supervised, often end up adapting bad practices. To avoid that, especially when you are making your first steps in programming, I recommend looking for a person who will supervise you and teach you. A strong mentorship with someone engaged in a serious project, as well as communication within the community in the form of sharing code and asking for feedback, is worth the effort. Similarly, when you are applying for your first job, you want to be looking for a company with a strong team and a good leader who would be keen on investing into your learning.

Now, let’s return to practical experience. Learning by doing is different from learning by passively consuming the information. To make sure we can use all the newly acquired technology, we should put our skills to test and write tons of code. The benefits of hands-on experience are almost endless.

Efficiency and Productivity

By practicing, you get a clear understanding of what programming is. Consequently, you start doing better with each new hands-on task, complete it faster, and thus become more productive.

Even if you are not working on real-world projects yet, it’s important to get used to having deadlines. They are inextricably linked to the programming process. My recommendation is to set up your own deadlines while practicing stage and follow them as closely as possible.

#java #learn java #java code #learn java in easy way #learn java course #learn java development