The latest articles on DEV Community by Omar (@omar99). https://dev.to/omar99 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F1151012%2Ff96e04ae-3576-452c-8c8c-ca664e1cf7bf.jpg https://dev.to/omar99 en Omar Sun, 30 Jun 2024 13:10:20 +0000 https://dev.to/omar99/most-important-command-line-notes-345g https://dev.to/omar99/most-important-command-line-notes-345g <p><strong>I finished the Command Line course from Elzero Web School on YouTube and the link to the notes document.</strong><br> <a href="https://docs.google.com/document/d/1V-uM4pyXYzr3J2jLjtPLjoE-Hckh57c7o67Ql6vbo5M/edit?usp=sharing">cmd course - elzero - notes commands</a><br> <strong>Note: The course is in Arabic but the notes are in English.</strong></p> cmd tutorial Omar Fri, 10 May 2024 23:12:47 +0000 https://dev.to/omar99/java-developers-squad-on-daily-dev-join-us-2io4 https://dev.to/omar99/java-developers-squad-on-daily-dev-join-us-2io4 <p><strong>To Java Developers! I made a Squad on Daily Dev, please join us there by the link below:</strong><br> <a href="https://dly.to/rEsT428yZkC">Java Developers</a></p> Omar Tue, 07 May 2024 10:52:41 +0000 https://dev.to/omar99/tech-notes-01-default-constructor-and-user-defined-constructor-in-java-2op3 https://dev.to/omar99/tech-notes-01-default-constructor-and-user-defined-constructor-in-java-2op3 <p><strong>I'm studying OOP using the <em>Java How to Program Book</em>. In exercise 4.19 - <em>(Sales Commission Calculator)</em> when I try to solve it. If we have two <code>constructors</code>when you call <code>one</code>of them, <code>JVM</code>will ignore the other <code>one</code>.</strong><br> <strong>Check the pictures to know more.</strong></p> <p><strong>1. case 1:</strong></p> <p><a href="https://media.dev.to/cdn-cgi/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fhisrdmpyogxzv601gya6.png" class="article-body-image-wrapper"><img src="https://media.dev.to/cdn-cgi/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fhisrdmpyogxzv601gya6.png" alt="Image description" width="800" height="530"></a></p> <p><strong>In the <code>default constructor</code> I just initialized</strong><br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>this.rate = 0.09; </code></pre> </div> <p><strong>variable, but I didn't use this <code>constructor</code>by the way!</strong></p> <p><strong>2.case 2:</strong></p> <p><a href="https://media.dev.to/cdn-cgi/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Frfozgxksynf3t74jkcmr.png" class="article-body-image-wrapper"><img src="https://media.dev.to/cdn-cgi/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Frfozgxksynf3t74jkcmr.png" alt="Image description" width="800" height="573"></a></p> <p><strong>I did initialize</strong><br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>this.rate = 0.09; </code></pre> </div> <p><strong>with a non-zero value, if I didn't give it a value, the compiler will equal it to zero **<br> **Note: this is an opinion, I'm a student, if you have another answer for this case, please tell me! Thanks!</strong></p> java oop constructor learnwithme