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Collections
What is the difference b/w 2d array and hashmap?Where we have to use this?Explain ? Thanks in advance
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How would you go about designing a better system?
Interviewer asked me this question in a interview. I could not give a clear answer. Can someone please help me to answer this question? Or point me to the websites that talk about How to Design a Good Software System. Thank you very much.
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Interface and Abstract Class Usage
When will you use an interface and abstract class?
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Use of Static
What is the use of static in (public static void main string args[])
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Object Class
When you declare a class, why does it automatically extends to object class? Give 2 reasons.
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Object Class Methods
Why wait() and notify() are used only for threads, why not to objects?
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Primitive Types
What happens when you add a primitive type (e.g. double) value to a collection?
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Find the Output
class A{ public static void main(String[] a){ System.out.print(String.valueOf(1)+String.valueOf(2)); String s1="s1"; String s2=s1.toString(); System.out.print(","+(s1==s2)); }}
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Double Value
What happens when you add a double value to a String?
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Struts Framework
Why we use Struts framework in project?
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Struts Heirarchy of Files
What is heirarchy of files in Struts?
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Struts ActionServlet
why do we have only one ActionServlet in Struts?(Asked in Polaris Interview for Java Experienced people , on April 11, Chennai)
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difference between Struts 1.x and Struts 2.x
What is the difference between Struts 1.x and Struts 2.x
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Dependency injection
What is dependency injection ?
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java patterns
Explain java patterns in detail? Any difference between Design patterns and java patterns ? . Explain about advantages of using patterns with an example.
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What is the advantage of using static methods in real time applications?
When we use static methods and when we use final methods? Explain with a suitable example..
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why servlet is used as controller ?not JSP? i want complete Explation?
In struts servlet control the application and we know that a jsp compiled into a servlet first. The only problem with the servlet is that it needs to write out.println call per HTML line. But as a controller in struts servlets do not force the programmers to write out.println, that is the part of JSP which acts as View.So if the controller would be JSP the translation (JSP compiled to a servlet)step...
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How Data Access Object (DAO) class will handle the data
Suppose there are 2500 records to be handled? How Data Access Object (DAO) class will handle it?
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What is the difference between Abstract Factory Pattern and factory Pattern?
What is the difference between Abstract Factory Pattern and factory Pattern? When would you use each of them?
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