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Oracle (and others) highly recommend uninstalling outdated and unsupported versions of Java, due to unresolved security issues in older versions.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
I am currently learning JDBC for the first time.For example, if you run a select statement and create an entity class to store the returned values, I would like to ask you a question about how to do i...
static final int ROW = 4;static final int COL = 3;public static void main(String[] args) { String[][] parkingSpace = new String[ROW][COL]; System.out.println( \t1\t2\t3); String fill = □; for(int i=0;...
int menu = scanner.nextInt();System.out.print(The menu you want + menu + Is the number correct? (Y/N):);String yn = scanner.next(); And then If you enter Y, the menu + Number order has been completed....
When you say getText() in Swing, the return value is String If you look at the return value of the password field getPassword, it's char[].If you look at that, String has security issues or uses it mo...
As far as I know, i+=j; and i=i+j have the same meaning int i = 5; long j = 8;If I = i+j;, it can't be compiled. If I = j;, it runs well I wonder why.
I will Element[] array = {new Element(1), new Element(2), new Element(3)};I initialized this arrangement ArrayList<Element> arraylist = ???;How do I put it in here?
I'd like to check all the mapped pairs by rotating the repeat statement. What's the most efficient way?And does the order of the objects change depending on the map implementation?
ArrayList<String> places = new ArrayList<String>(); places.add(Buenos Aires); places.add(Córdoba); places.add(La Plata);For example, there is a source like this, and I want to reduce the i...
try { something(); return success; } catch (Exception e) { return failure; } finally { System.out.println(i don't know if this will get printed out.); }Even if I return in try and catch in...
What is the main difference between an internal class and a static internal class? Is it just a difference in design design?
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