java tag

Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (WORA), meaning that compiled Java code can run on all platforms that support Java without the need to recompile. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but has fewer low-level facilities than either of them. The Java runtime provides dynamic capabilities (such as reflection and runtime code modification) that are typically not available in traditional compiled languages. As of 2019, Java was one of the most popular programming languages in use according to GitHub, particularly for client–server web applications, with a reported 9 million developers.

Java was originally developed by James Gosling at Sun Microsystems and released in May 1995 as a core component of Sun Microsystems' Java platform. The original and reference implementation Java compilers, virtual machines, and class libraries were originally released by Sun under proprietary licenses. As of May 2007, in compliance with the specifications of the Java Community Process, Sun had relicensed most of its Java technologies under the GPL-2.0-only license. Oracle offers its own HotSpot Java Virtual Machine, however the official reference implementation is the OpenJDK JVM which is free open-source software and used by most developers and is the default JVM for almost all Linux distributions.

As of March 2022, Java 18 is the latest version, while Java 17, 11 and 8 are the current long-term support (LTS) versions. Oracle released the last zero-cost public update for the legacy version Java 8 LTS in January 2019 for commercial use, although it will otherwise still support Java 8 with public updates for personal use indefinitely. Other vendors have begun to offer zero-cost builds of OpenJDK 18 and 8, 11 and 17 that are still receiving security and other upgrades.

Oracle (and others) highly recommend uninstalling outdated and unsupported versions of Java, due to unresolved security issues in older versions. Oracle advises its users to immediately transition to a supported version, such as one of the LTS versions (8, 11, 17).

Reference: WIKIPEDIA

1495 questions


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Passing the string string in server-client communication in the Rest API

I would like to pass String type strings in a different way than query parameters for server-client communication in Rest API.The sources we tried are as follows:Client Side HttpHeaders heads = new Ht...

2 years ago

2 answers
28 views
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Understanding JMeter BSF PreProcessor Behavior

In order to test the load on the web application, I am making a test plan with JMeter.Because the UUID needs to be randomly POSTed in the POST data of the web application, the BSF PreProcessor is tryi...

2 years ago

1 answers
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move frames by keyboard input

When you press the arrow on your keyboard, you are creating a program where the displayed frame moves 10 times in that direction.The input of the keyboard is detected, but the frame does not move.How ...

2 years ago

1 answers
108 views
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Information About Implementing Spring Custom Annotations

Spring Custom Annotation Story - Qiita I saw the above website.I understand that Constraint Annotation has a fixed model (message(), groups(), and payload(), but is it possible to add a condition for ...

2 years ago

1 answers
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Repaint does not call paintComponent.

public class BI2DPv extensions javax.swing.JPanel{ BufferedImage bi;// Draw to this and then transfer to g2 @ Override public void paintComponent (Graphics g) { // super.paintComponent(g); Graphics ...

2 years ago

1 answers
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About the number of xml transparent images on Android and the processing speed.

Thank you for your continued support on this site.It seems that the cause of the animation, which I didn't know the cause more than before, and the reason why the frame seemed to fall off when the ima...

2 years ago

1 answers
37 views
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I created an application that starts the timer at a specific time, but the countdown does not work at the specified time.

We are developing Android apps using Java.I set the conditional branch using localtime and isafter so that the timer starts at a specific time, but the countdown does not work at the specified time.Wh...

2 years ago

2 answers
79 views
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How to request if you have multiple channels in a single Google account on YouTube data api

I am using Youtube data apiv3 with a client for Java.YouTube.Channels.List channelRequest=youTube.channels().list(id, snippet, contentDetails);channelRequest.setMine(true);channelRequest.setMaxResults...


1 answers
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Understanding Regular Expressions in Java for HTML

What are the Java regular expressions?<HTML><HEAD><META http-equiv=Content-Type content=text/html;charset=UTF-8>/HEAD><BODY><DIV style=background-color:text-align:left;wo...


2 answers
159 views
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I don't know how to create multi-projects in Eclipse

I would like to create an Android application with Eclipse.The server side will also be created with Java+Spring.I would like to communicate between Android and the server using JSON, so I am thinking...

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