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The original and reference implementation Java compilers, virtual machines, and class libraries were developed by Sun from 1995. As of May 2007, in compliance with the specifications of the Java Community Process, Sun relicensed most of their Java technologies under the GNU General Public License. Others have also developed alternative implementations of these Sun technologies, such as the GNU Compiler for Java and GNU Classpath.
One characteristic of Java is portability, which means that computer programs written in the Java language must run similarly on any supported hardware/operating-system platform. This is achieved by compiling the Java language code to an intermediate representation called Java bytecode, instead of directly to platform-specific machine code. Java bytecode instructions are analogous to machine code, but are intended to be interpreted by a virtual machine (VM) written specifically for the host hardware. End-users commonly use a Java Runtime Environment (JRE) installed on their own machine for standalone Java applications, or in a Web browser for Java applets.
Standardized libraries provide a generic way to access host-specific features such as graphics, threading and networking.
A major benefit of using bytecode is porting. However, the overhead of interpretation means that interpreted programs almost always run more slowly than programs compiled to native executables would, and Java suffered a reputation for poor performance. This gap has been narrowed by a number of optimization techniques introduced in the more recent JVM implementations.
Programs written in Java have a reputation for being slower and requiring more memory than those written in some other languages. However, Java programs' execution speed improved significantly with the introduction of Just-in-time compilation in 1997/1998 for Java 1.1, the addition of language features supporting better code analysis (such as inner classes, StringBuffer class, optional assertions, ect.), and optimizations in the Java Virtual Machine itself, such as HotSpot becoming the default for Sun's JVM in 2000.
To boost even further the speed performances that can be achieved using the Java language Systronix made JStik, a microcontroller based on the aJile Systems line of embedded Java processors.
Java uses an automatic garbage collector to manage memory in the object lifecycle. The programmer determines when objects are created, and the Java runtime is responsible for recovering the memory once objects are no longer in use. Once no references to an object remain, the unreachable memory becomes eligible to be freed automatically by the garbage collector. Something similar to a memory leak may still occur if a programmer's code holds a reference to an object that is no longer needed, typically when objects that are no longer needed are stored in containers that are still in use. If methods for a nonexistent object are called, a "null pointer exception" is thrown.
One of the ideas behind Java's automatic memory management model is that programmers be spared the burden of having to perform manual memory management. In some languages memory for the creation of objects is implicitly allocated on the stack, or explicitly allocated and deallocated from the heap. Either way, the responsibility of managing memory resides with the programmer. If the program does not deallocate an object, a memory leak occurs. If the program attempts to access or deallocate memory that has already been deallocated, the result is undefined and difficult to predict, and the program is likely to become unstable and/or crash. This can be partially remedied by the use of smart pointers, but these add overhead and complexity. Note that garbage collection does not prevent 'logical' memory leaks, i.e. those where the memory is still referenced but never used.
Garbage collection may happen at any time. Ideally, it will occur when a program is idle. It is guaranteed to be triggered if there is insufficient free memory on the heap to allocate a new object; this can cause a program to stall momentarily. Explicit memory management is not possible in Java.
Java does not support C/C++ style pointer arithmetic, where object addresses and unsigned integers (usually long integers) can be used interchangeably. This allows the garbage collector to relocate referenced objects, and ensures type safety and security.
As in C++ and some other object-oriented languages, variables of Java's primitive data types are not objects. Values of primitive types are either stored directly in fields (for objects) or on the stack (for methods) rather than on the heap, as commonly true for objects (but see Escape analysis). This was a conscious decision by Java's designers for performance reasons. Because of this, Java was not considered to be a pure object-oriented programming language. However, as of Java 5.0, autoboxing enables programmers to proceed as if primitive types are instances of their wrapper classes. |
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| | | JavaFX, Applet, JVM, J2EE, JSP, J2ME, J2SE, JavaBeans, Servlet, OSGi, JDK, Jar, JStik, JRE, Swing |
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| News or Articles | mentioning Java |
| Aptana Unveils Cloud Integration for Java and Eclipse - Company announces availability of Java support in its application hosting and life-cycle management service Aptana Cloud Connect.Aptana, Inc., a provider of web development, deployment and management solutions, yesterday announced the availability of Java support in its application hosting and life-cycle management service, Aptana Cloud Connect. The company says that Aptana Cloud Connect is architected to integrate with both leading cloud hosting providers and Aptana Studio, the ...
Amazon Makes Java Deployment Easier On EC2 - Less than a month after enabling developers to launch Windows and SQL Server instances in the Europe, cloud infrastructure provider Amazon Web Services (aws.amazon.com) has introduced the AWS Toolkit for Eclipse (www.eclipse.org), a plug-in for the Eclipse Java IDE that makes it easier for Amazon EC2 developers to develop, deploy, and debug Java applications on Amazon's infrastructure.According to Amazon's announcement this week, the AWS Toolkit for Eclipse lets developers get ...
Ensim and Sun to Automate Management Of Server-Side Java Applications - Hosting automation company Ensim Corporation (Ensim.com), and Sun Microsystems, Inc. (Sun.com) today announced an alliance that will enable the provisioning, management and deployment of server-side Java(TM) applications. Ensim's adoption of Java in its ServerXchange hosting operations platform will provide hosting companies with a single-console management solution that embraces the server hardware and applications, as well as the growing use of dynamic Web content, for the rapid deployment of ...
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