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Oracle (and others) highly recommend uninstalling outdated and unsupported versions of Java, due to unresolved security issues in older versions.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

1476 questions


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I want Python to search for multiple java files in the target directory and get the defined class name

I would like to explore several java files in the target directory and earn the defined class name.For example, if you have target_dir/Car.java Train.java, I would like to receive the class names Car ...

1 weeks ago

1 answers
351 views
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Inquire how to design tables when creating dynamic bulletin boards

You are about to implement dynamically generated bulletin boards.I'm asking you this question because I'm curious about how other people implement it.Method 1: Push into one table.==> This method i...

1 weeks ago

1 answers
228 views
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PROGRAM FOR SAVING INPUT CHARACTER STRING IN FILE

Instead of using the scanner class in java, we create a program that reads the string entered line by line until a blank character is entered and writes it to a file if a blank character is entered.Ex...

1 weeks ago

2 answers
339 views
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Should I use StringBuffer or StringBuilder for SQL statement assembly?

There are Tomcat, which is accessed by multiple people at the same time, and web applications that run on IIS.SQL statements are dynamically assembled within the application, taking into account on-sc...

1 weeks ago

1 answers
337 views
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I want to know how to run the loadPage method inside the run method

I have to run the loadPage method when the button is clicked using a new run method, but I don't know what code to write in the run method.private void loadPage() { urlButton.setDisable(true); textFlo...

2 weeks ago

1 answers
318 views
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How do I empty or clean the String Builder?

You are using StringBuilder in the loop and want to start with an empty StringBuilder and empty after x iterations.The functionality corresponding to the NET String Builder is not displayed. Only remo...

2 weeks ago

2 answers
268 views
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Understanding How Java Open Files Without a System Cache for Reading and Writing Data

Question SummaryCould you tell me how Java can do the following things that Win32 API does?Open files without a system cache to read and write dataI'm investigating, but I can't find any means at the ...

3 weeks ago

1 answers
324 views
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I want to make the following program in java, but I don't know.please tell me。

Consider (x,y,n) satisfying 1/x+1/y=1/n,x yy with x,y,n as a positive integer.For example, when n=4, there are three different solutions (x, y, 4).Concretely, there are three of 1/5+1/20=1/4→(x,y,n)=(...

3 weeks ago

1 answers
365 views
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When you create a calculator that calculates an expression, it is not calculated well if there are multiple operators in the expression.

I'm working on a one-line calculator program.If you use two numbers, such as 1+1, the calculation will be successful, but if the number is more than three (e.g., 1010+10+10, 11+1+1+1+1).The answer to ...

3 weeks ago

1 answers
293 views
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Unable to export file!

The program below reads three files (txt1, txt2, txt3) and outputs them to the console, creating and writing three other files (txt4, txt5, txt6).The console outputs the file and creates a file, but a...

1 months ago
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