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


 

 
 Core Java interview questions  Core Java Interview Questions (1722)
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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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wht is mean by dirty read?   1
Why const and goto are reserved keyword in java?   1
What is the difference(or similarity if there are some) between object and a variable? ME 4
What is lazy activation? CMC 2
What is the use of ?this??   4
Explain the difference between getAppletInfo and getParameterInfo?   1
why we cannot declare static variable inside a static method   4
any other way to print the text without using System.out.println() in java? Ibm 4
What are concepts of OOPS and how are they implemented in Java? KPIT 2
There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it? KPIT 9
what difference between throw and throws in exception handling.   5
Howmany number of objects we can store in an ArrayList. Is there any limit? TCS 6
 
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