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Easy Learn Java: Programming Articles, Examples and Tips - Page 51


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My Java application is for system with small memory. How to get the system's fre

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Question: I am writing a Java application for system with small memory.

To make it reliable I would like to monitor memory size in my program and try to decrease program activity to enable Garbage Collector do its job before all memory will be consumed. When enough memory will be available program must continue the job.

How can I info about free memory in my Java application?

Answer: Your idea to design long time running program for an extreme environment is excellent! Smile

Use Runtime.totalMemory() - you get the total amount of memory in the Java virtual machine. This value varies all the time, depending on the host environment. Note that the amount of memory required to hold an object of any given type may be implementation-dependent...

and

Runtime.freeMemory() - you get info about free memory in the Java Virtual Machine. Calling the gc method may result in increasing the value returned by freeMemory.



103 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Friday, May 09, 2003 (00:00:00) (3335 reads)

What is relation between JAXP and Xerces?

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Question: What is relation between JAXP and Xerces?

Answer: JAXP is a set of interfaces and Xerces is one of JAXP implementations.

JAXP plays the same role for Xerces like Oracle's JDBC Driver for Oracle.

JAXP is an API, more accurately called an abstraction layer. JAXP doesn't provide a new ways for XML parsing , or adds new possibilities and functionality to handling Java with XML . Instead, JAXP makes it easier to use SAX and DOM to deal with some difficult tasks. It also makes it possible to handle some vendor-specific tasks in a vendor-neutral way.

The Java API for XML Processing (JAXP) supports processing of XML documents using DOM, SAX, and XSLT. JAXP enables applications to parse and transform XML documents independent of a particular XML processing implementation.

Depending on the needs of the application, developers have the flexibility to swap between XML processors (such as high performance vs. memory conservative parsers) without making application code changes.

Thus, application and tools developers can rapidly and easily XML-enable their Java applications for e-commerce, application integration, and dynamic Web publishing. Just added into the JAXP 1.2 reference implementation is support for XML schema and an XSLT compiler (XSLTC). These new features are also available as part of the Java Web Services Developer Pack (Java WSDP) v1.0_01 and as part of the Java XML Pack Summer 02 Update Release.



5 comments | Printer Friendly Page  Send to a Friend | Score: 4.4
Posted by jalex on Thursday, May 08, 2003 (00:00:00) (7039 reads)

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