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Categories >> Software >> Java Related >> Java J2EE >> Core Java
 
 


 

 
 Core Java interview questions  Core Java Interview Questions (1721)
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 Servlets interview questions  Servlets Interview Questions (255)
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 Java J2EE AllOther interview questions  Java J2EE AllOther Interview Questions (87)
Question
I have one Shopping cart application, i that i have 
selected some items, while clicking submit button by 
mistake i have clicked twice or trice, that time items are 
selected twice or trice. Actually i want only one copy of 
items but its selected twice or trice. So how can we avoid 
this problem?
 Question Submitted By :: Core-Java
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
If this question in core (jave Collection): if you are
using list,it will take the duplicate values. so pass
through this list into set it will remove the duplicate
values.

if this question in J2EE servlets: use post method, it it
is not idempotent. once you add item to cart, it will give
the acknowledge before changing in server.
 
Is This Answer Correct ?    10 Yes 2 No
Veera
 
Answer
# 2
Using token mechanism in struts we can duplicate requests in
web applications.
 
Is This Answer Correct ?    2 Yes 2 No
Balagangadhar
 
 
 

 
 
 
Other Core Java Interview Questions
 
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What is Restrictions in hibernate? Bally-Technologies 1
what is mean by thread lock? infosys 2
What method is used to compare two strings ?   4
How TreeMap sorts the objects inside it?? suppose if have include one employee object and one car object. On what basis it will sort?   5
What is aggregation and composition ? Fidelity 1
why java is platform independent? IBM 5
what is difference between validation.xml & validation rules.xml? BirlaSoft 8
1.what is the exact difference between applet and frame? 2.Do we use main method in frames?   4
when,where and how to use abstract class and interface   2
what is type of statement in jdbc connection?   3
How to sort a vector elements that contains the user define class object? (Note: If Suppose consider, A Student class contain two data members. They are String studentName and int rollNo. I am creating Four objects for this class, each object contains students details like name and roll no. Now i am storing that objects in vector and if i retiving the elements from the vector means then it should be display in sorting order) ProdEx-Technologies 3
Can we add two byte variables and assign the result to a byte variable ? b=b1+b2 where b,b1,b2 are byte types TCS 4
 
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