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This is achieved by compiling the Java language code to an intermediate representation called Java bytecode, instead of directly to architecture-specific machine code. Java bytecode instructions are analogous to machine code, but they are intended to be executed by a virtual machine (VM) written specifically for the host hardware. End-users commonly use a Java Runtime Environment (JRE) installed on their device for standalone Java applications or a web browser for Java applets. Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. The syntax of Java is similar to C and C++, but has fewer low-level facilities than either of them.
The language is specified by the Java Language Specification (JLS); changes to the JLS are managed under JSR 901. The Java launcher launches Java by loading a given class (specified on the command line or as an attribute in a JAR) and starting its public static void main(String) method. The String args parameter is an array of String objects containing any arguments passed to the class. It is simply the name of the method the Java launcher calls to pass control to the program. Java classes that run in managed environments such as applets and Enterprise JavaBeans do not use or need a main() method.
The string «Hello World!» is automatically converted to a String object by the compiler. The classes in the Java APIs are organized into separate groups called packages. Each package contains a set of related interfaces, classes, subpackages and exceptions. Starting with JDK 7u40 release, Java menu items are added to the Windows Start Menu to provide easy access to Java resources. The installer may ask you to reboot your computer if you chose not to restart an internet browser when it prompted you to do so. The installer cannot proceed with the current Internet Connection proxy settings.
JEP 405 allows record patterns, extending the pattern matching capabilities of instanceof operators, and switch expressions, to include record patterns that explicitly refer to the components of the record. Java 5 was first available on Apple Mac OS X 10.4 (Tiger) and was the default version of Java installed on Apple Mac OS X 10.5 (Leopard).
During the development phase, new builds including enhancements and bug fixes were released approximately weekly. Beta versions were released in February and June 2006, leading up to a final release that occurred on December 11, 2006. These downloads can be used for development, personal use, or to run Oracle licensed products. Use for other
purposes, including production or commercial use, requires a Java SE Universal Subscription or another Oracle license. GraalVM for JDK 17 will receive updates under the GFTC, until September 2024.
Java does not support C/C++ style pointer arithmetic, where object addresses can be arithmetically manipulated (e.g. by adding or subtracting an offset). This allows the garbage collector to relocate referenced objects and ensures type safety and security. If you saved the JRE installer to your computer, run the installer by double-clicking it. The installer notifies you if Java content is disabled in web browsers, and provides instructions for enabling it.