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Categories >> Software >> Java Related >> Java J2EE >> Struts
 
 


 

 
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Question
what is the difference between SAX Parser and DOM Parser??
 Question Submitted By :: Struts
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Both SAX and DOM are used to parse the XML document. Both
has advantages and disadvantages and can be used in our
programming depending on the situation
SAX:
1. Parses node by node
2. Doesnt store the XML in memory
3. We cant insert or delete a node
4. Top to bottom traversing
DOM
1. Stores the entire XML document into memory before processing
2. Occupies more memory
3. We can insert or delete nodes
4. Traverse in any direction.
If we need to find a node and doesnt need to insert or
delete we can go with SAX itself otherwise DOM provided we
have more memory.
 
Is This Answer Correct ?    189 Yes 11 No
Penchala
 
Answer
# 2
1. sax is an event based parser and raise and event, while
dom is not
2. sax is forward only where as dom can acess both was
forward as well as backwards.
3. sax parses the file as it reads where as the dom loads
the file into memory to parse the file.
4. Sax does not have memory constraints where as the dom
has momory constraints as xml file is loaded into the
momory to parse the file.
5. sax is read only , dom is read and write both.
6. if you have to parse and use the content only once ,
consider using sax if the xml file and content are used
extensively then consider using dom
 
Is This Answer Correct ?    185 Yes 12 No
Guest
 
 
 
Answer
# 3
hii Penchala..

U r Explination is pretty good..
 
Is This Answer Correct ?    47 Yes 14 No
Chaithanya
 
Answer
# 4
It really nice Explanation by penchala the more about XML

SAX :
---
SAX Parser is the one which is developed to run the java
programs especially.

DOM:
---
DOM is developed by w3c consortium so that it is an open
standard.
In DOM the xml file is arranged as a tree and backward and
forward search is possible for searching the tags and
evaluating the data which it holds.
It depends upon the application and ease of data
accessiblity.
If we want to extract the data from a xml file once we
have to move to SAX which is one time top to bottom read
approach and if we want ot randomly pick the data in an xml
file then the tree reperesentation of DOM model is to be
put into use. Thats all !
 
Is This Answer Correct ?    35 Yes 7 No
Shyam Miyatra
 
Answer
# 5
very nice explaination 
Is This Answer Correct ?    27 Yes 12 No
Venkateswarlu
 
Answer
# 6
Cant we insert or delete a node in SAX???? 
Is This Answer Correct ?    48 Yes 35 No
Simi
 
Answer
# 7
DOM
1. Tree of nodes
2. Memory: Occupies more memory, preffered for small XML
documents
3. Slower at runtime
4. Stored as objects
5. Programmatically easy
6. Ease of navigation
SAX
1. Sequence of events
2. Doesn't use any memory preferred for large documents
3. Faster at runtime
4. Objects are to be created
5. Need to write code for creating objects
6. Backward navigation is not possible as it sequentially
processes the document
 
Is This Answer Correct ?    17 Yes 5 No
Ashish
 
Answer
# 8
very good explanation

Thank you.
 
Is This Answer Correct ?    13 Yes 5 No
Madhu
 
Answer
# 9
Thank you..it helped us a lot :) 
Is This Answer Correct ?    10 Yes 5 No
Natasha,ashwni,smita,prajakta
 
Answer
# 10
sax is simple api for xml
it read the first xml data and get outputed backward is not
possible,
dom is doccument object model
through dom we can create a xml data as a tree and it is
loaded in memory so we can easily access the data
 
Is This Answer Correct ?    7 Yes 4 No
Chaitheesh
 

 
 
 
Other Struts Interview Questions
 
  Question Asked @ Answers
 
explain the struts-configuration file? TCS 3
What is Portlet???? when,where and why we use it ?? Wipro 3
why servlet is used as controller not JSP? MCS 6
what is struts? why Struts? TCS 6
wahts the diif between Mvc1 and Mvc2? Wipro 3
Where can i get jar file for use the struts-tags in struts2?   2
struts comes under which layer of three tire architecture in real time projects plz i need explaination? Infinite-Computer-Solutions 10
What is the difference between a Strut and a Class?   1
how you implement and maintain your struts project by using MVC2 arch? Wipro 2
what are the type of forward class in Struts? Wipro 5
1.Which of the following can be performed using interceptors by the developer? 1. Provide pre-processing logic before invoking the action 2. Interact with the action and set the request parameter on the action 3. Provide post-processing logic after invoking the action 4. Modify the result 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 2.Interceptors can be used for which of the following tasks? 1. Checking security and bottleneck 2. Tracing the log 3. Validating user input 4. Uploading file 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 3.The ValueStack is made up of which of the following objects? 1. Temporary Objects 2. Model Object 3. Action Object 4. Permanent Object 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 4.Which of the following statements are correct? Apache Struts is a Java based framework that separates the application logic from the presentation layer. Action is based on pull-MVC framework which means that the data to be displayed is pulled from the action class which is a POJO class acting as a model in the Web application. OGNL is a powerful expression language that allows you to refer and manipulate the data present on the ValueStack. Declarative architecture enables you to integrate the different components present in the Web application either using XML files or Annotations. 5.Which of the following are the examples of helpers? 1. Action Interface 2. ActionSupport Class 3. ActionImplement Interface 1, 2 2, 3 1, 3 1, 2, 3 6.The Struts 2 filter performs which of the following tasks? 1. Installation of the Action class 2. Execution of the method specified in the configuration file 3. Reading of the control string 1, 2 2, 3 1, 3 1, 2, 3 7.Which of the following value for the debug parameter displays an OGNL console to test OGNL expressions against the value stack? xml console command All of the above. 8.Which of the following are correct statements? The execute () method of the action class defines business logic implementations. ActionSupport class adds useful utilities to the class that extends it. Set of Interceptors are grouped into a stack known as Interceptor Stack. All of the above. 9.Which of the following annotation helps to set the path of the action URL? It is placed before the action class and it applies to all actions defined in the class, even if the fully qualified URLs are not supplied. @Namespace @Result @Results @ParentPackage 10.Which of the following statements are correct related to OGNL and Annotations? OGNL is an expression and binding language that is used for getting and setting the properties of the Java objects. Annotations acts as an alternative to HTML and Java properties configuration file. Action Annotations are available when the framework scans the classpath for action classes. Lifecycle callback annotations are invoked at any time during the processing of an action. 11.Which of the following are the features of the new unified Expression Language? Deferred evaluation of expression Support expressions that can set values and invoke methods Provides a pluggable API for resolving expressions All of the above. 12.By introducing the new feature by JSF, improvements have been made in which of the following areas? Set of standard converter messages Addition of requiredMessage, converterMessage, and validatorMessage attribute for input components. Displaying the error message using the input component name with the help of label attribute added to the input components All of the above. 13.Which of the following statements are correct about the 'label' attribute? In JSF 2.1, the label attribute have been introduced with the input components. The label attribute can accept literal or value expressions. The Literal or value expressions accepted by label attribute is prefixed before the components error message. All of the above. 14.Which of the following statements are correct? EL allows developers to use simple expressions to dynamically access data from JavaBeans components. EL supports only deferred evaluation. A value expression can either yield a value or set a value and can be used for both read and write. In immediate evaluation, the expression is evaluated immediately. 15.Which of the following statements are correct? Method expression invokes as arbitrary private method of an arbitrary object by passing a specified set of parameters and returning results from the calling method. JSTL is a part of Java EE 5 platform. JSF 1.2 includes a set of messages for standard converters. The requiredMessage, converterMessage, or the validatorMessage attribute of the input components are used to provide custom error messages. Wipro 2
struts is thread safe or not ?give me answer as early as possible   4
 
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