Skip to main content

What does 'strictfp' mean?

--
The keyword strictfp allows you to have more (predictable) control over floating-point arithmetic. Different arithmetic/logic units may enable additional features which allow a machine dependent answer to a floating point problem. The Java Virtual Machine has been modified to allow Java implementations to use these features where developers are not concerned with a routine, possibly providing a different, ie: more *or* less accurate solution to a problem on differing architectures.

Because many developers want the exact same solution to occur regardless of the underlying hardware, the strictfp keyword was implemented. strictfp insures that the VMS will always use a standardized implementation of floating point numbers, wherever the application/applet is run. Thus continuity across platforms is achieved. When this modifier is specified, the JVM adheres to the Java specifications ( IEEE-754 floating-point specification ) and returns the consistent value independent of the platform.


It can be used as a modifier with top-level classes, both static and non-static inner classes, inner interfaces, both static and instance method declarations. Variables, constructors, static or instance floating blocks can't have this modifier.

If an expression is FP-strict, all intermediate values should fit into the range for float or double variables, implying that the results of all FP-strict expressions must be those predicted by IEEE 754 arithmetic on operands represented using single and double formats. If an expression is not FP-strict, there are no such restrictions.

A non-constant expression is considered FP-strict if any of the class, interface or method declarations that contain the expression have the strictfp modifier.

Labels:

Comments

Post a Comment

Popular posts from this blog

Advantages & Disadvantages of Synchronous / Asynchronous Communications?

  Asynchronous Communication Advantages: Requests need not be targeted to specific server. Service need not be available when request is made. No blocking, so resources could be freed.  Could use connectionless protocol Disadvantages: Response times are unpredictable. Error handling usually more complex.  Usually requires connection-oriented protocol.  Harder to design apps Synchronous Communication Advantages: Easy to program Outcome is known immediately  Error recovery easier (usually)  Better real-time response (usually) Disadvantages: Service must be up and ready. Requestor blocks, held resources are “tied up”.  Usually requires connection-oriented protocol
Post a Comment
Continue Reading >>>>

WebSphere MQ Interview Questions

What is MQ and what does it do? Ans. MQ stands for MESSAGE QUEUEING. WebSphere MQ allows application programs to use message queuing to participate in message-driven processing. Application programs can communicate across different platforms by using the appropriate message queuing software products. What is Message driven process? Ans . When messages arrive on a queue, they can automatically start an application using triggering. If necessary, the applications can be stopped when the message (or messages) have been processed. What are advantages of the MQ? Ans. 1. Integration. 2. Asynchrony 3. Assured Delivery 4. Scalability. How does it support the Integration? Ans. Because the MQ is independent of the Operating System you use i.e. it may be Windows, Solaris,AIX.It is independent of the protocol (i.e. TCP/IP, LU6.2, SNA, NetBIOS, UDP).It is not required that both the sender and receiver should be running on the same platform What is Asynchrony? Ans. With messag
11 comments
Continue Reading >>>>

XML Binding with JAXB 2.0 - Tutorial

Java Architecture for XML Binding (JAXB) is an API/framework that binds XML schema to Java representations. Java objects may then subsequently be used to marshal or unmarshal XML documents. Marshalling an XML document means creating an XML document from Java objects. Unmarshalling means creating creating a Java representation of an XML document (or, in effect, the reverse of marshaling). You retrieve the element and attribute values of the XML document from the Java representation. The JAXB 2.0 specification is implemented in JWSDP 2.0. JAXB 2.0 has some new features, which facilitate the marshalling and unmarshalling of an XML document. JAXB 2.0 also allows you to map a Java object to an XML document or an XML Schema. Some of the new features in JAXB 2.0 include: Smaller runtime libraries are required for JAXB 2.0, which require lesser runtime memory. Significantly, fewer Java classes are generated from a schema, compared to JAXB 1.0. For each top-level complexType, 2.0 generates a v
Post a Comment
Continue Reading >>>>