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Java Interview Questions and Answers

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Questions Question: How can we use hashset in collection interface?
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Questions Question: What is difference between java.lang .Class and java.lang.ClassLoader? What is the hierarchy of ClassLoader ?
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Questions Question: What is difference between array & arraylist?
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Questions Question: If interface & abstract class have same methods & abstract class also not contain any implementation for those methods which one you prefer ?
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Questions Question: How can you load DLL files when your java class is loading first time ?
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Questions Question: What is difference between string and stringtokenizer?
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Questions Question: We know that Object class is super class of every class & a class extends only one class. so how is it possible to a class to extend other than Object class?
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Questions Question: What is JVM Heap Size? How does it affect the performance of the Application?
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Questions Question: How many JVM could be run on an operating system. if only one then what is the logical reason.
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Questions Question: What are differences between Enumeration, ArrayList, Hashtable and Collections and Collection?
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Questions Question: Which class is the super class for all classes in java.lang package?
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Questions Question: Why the container does not support multiple layout managers
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Questions Question: How to use JNI in java? and what are Struts and jini?and how to apply native code in java?
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Questions Question: Can wehave run() method directly without start() method in threads?
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Questions Question: When programmer using the vector and arrylist? and when ur using linkedlist and hashmap and hashtable?
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Questions Question: WHEN UR USING ARRAYLIST AND LIKEDLIST AND VECTOR AND HASHMAP AND HASHTABLE?
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Questions Question: if two overloaded methods are- Test(Object xyz) and test(Customer cust)[Assume Customer is a class with member name of type String].Now if we call test(null), which method will be called? why?
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Questions Question: How single threaded model works after implementation in class, basically architecture point of view.
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Questions Question: Is there any difference between Execution Engine and the JIT in java?
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Questions Question: If we have two public classes in a single java file ,how i have to give the name of the particular java file and how i can compile it?
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Latest 10 Answers
When there is any situation that u should attach a new patch to ur kernel , then download the patch and install it,to make changes to kernel , go to ok prompt and type boot -r, it will update or reconfigure the kernel
Honesty, helpful and reliable
procedure is a set of sql statement ,are combined to gether to perform a specific task or to solve a specifi problem.it does not return value.
leadership is power to influence a group so that the members willingly exert efforts as aspired by the leader.
I have the unique combination of technical skill and the ability to build strong customer relationship. I have the ability to stay focussed in stressfull situation. I would be great addition to your team.
first execute the bc search spec to fetch the data then executes the applet search spec if applet search spec is not match with bc it skips
TCP-Transmission Control Protocol. TCP is Reliable. TCP is Connection oriented. UDP-User Datagram Protoco UDP is Unreliable. UDP is Connectionless.
By default in structure all data member and member function are public,i,e if you not mentation any access specifier. But in case of class By default all data member and member function are private.
Structure is a user defined data type. By default all structure variables are public type and we cann't use access specifier in structure type variable, where as in class we can define objects(variables) under required access specifier type.
variable cost is the cost which is not fixed in nature

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