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Oracle (and others) highly recommend uninstalling outdated and unsupported versions of Java, due to unresolved security issues in older versions.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 make buttons dynamically. First, I set the style to xml like below, but I want to transfer it to the code.<Button android:id=@+id/buttonIdDoesntMatter android:layout_height=wrap_content android:l...
I don't know what the last value of ArrayList is. How do I get the last value of ArrayList?
I made the access restrictor of one of the elements private to design the class elements private. How can I get the value of stubIWant from the code below?class IWasDesignedPoorly { private int stuffI...
Is there a standard or a good way to create a temporary directory within a Java application?
No matter how much I look for information about stack overflow errors, there is no clear answer. Java documents show that the error java.lang.StackOverflowError is application says that the recursion ...
Is there an easy way to write OutputStream with InputStream? It's not hard to write to the byte buffer code, but I think I'm missing an easier way...If InputStream has in and OutputStream has out byte...
I was playing a problem solving game related to Java, and the keyword native came out. What is the native keyword used in Java?
Assuming there is a HashMap, how do I find the value of Integer as the string key value and update the value? The way to remove the existing value and enter a new one is concerned about overhead. The ...
What is the best way to avoid data loss when converting from long to int?public static int safeLongToInt(long l) { int i = (int)l; if ((long)i != l) { throw new IllegalArgumentException(l + cannot b...
What is the easiest way to put a space in a string in Java?I think there's something in an API like StringUtil, but it doesn't come out when I look it up. Please teach me.
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