Interview Questions and Answers for 'C' | Search Interview Question

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Q1381. Is it advisable to keep session or transaction open for long time just to avoid LazyInitializationException ?

Hibernate

Ans. No. It's a resource and performance overhead.

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Q1382. How to create list that will sort it's elements dynamically?

Algorithm

Ans. Override the behavior of collection class to sort the list upon each element addition. Though it's not recommended as list are sorting heavy data structures.

List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};

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Q1383. What is an execution engine within JVM ?

Core Java

Ans. Execution engine contains interpreter and JIT compiler, which covert byte code into machine code.

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Q1384. What are some of the Java Naming conventions ?

Core Java

Ans. 1. Class name should be a noun and should start with capital case character.

2. Interface Name should be an adjective and should start with capital case character.

3. Method and Variable names should follow lower camel case notation.

4. package name should be all lower case.

5. constant variables (static final) should be all capital case.

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Q1385. what is the repository structure in svn ?

SVN

^{This question was recently asked at 'Sri Tech'.This question is still unanswered. Can you please provide an answer.}

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Q1386. Write program to create a linked list and perform different operations on it.

Algorithm

Ans. import java.util.*;
class LinkedListSolution{
protected LinkedList list;
public LinkedListSolution(){
list = new LinkedList();
}
public Object pop() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.removeFirst();
}
public void push(Object obj){
list.addFirst(obj);
}
public Object peek() throws NoSuchElementException{
if(list.isEmpty())
throw new NoSuchElementException();
else
return list.getFirst();
}
public boolean isEmpty(){
return list.isEmpty();
}
public String toString(){
return list.toString();
}
}
class TestStack{
public static void main(String args[]){
LinkedListSolution s = new LinkedListSolution();
s.push("First");
s.push("Second");
s.push("Third");
System.out.println("Top: " s.peek());
s.push("Fourth");
while(!(s.isEmpty()))
System.out.println(s.pop());
}
}

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Q1387. write program to do matrix multiplication

Core Java

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Q1388. Can the foreign key column have null values ?

Database

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Q1389. How do threads share information ?

Core Java

Ans. Through common memory area.

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Q1390. What is Substitutability in Java ?

Core Java

Ans. Substitutability means that the type of the variable does not have to exactly match with the type of the value assigned to that variable. For example - Object reference of Parent object can hold derived object.

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Q1391. What is the precedence of operators in Java ?

Core Java

Ans. http://introcs.cs.princeton.edu/java/11precedence/

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Q1392. Can we override abstract methods ?

Core Java

Ans. Abstract methods are the methods that need to be overridden in the derived class ( either as implementing method or again abstract method ) so it's not only allowed but its required to override abstract method in the derived class.

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Q1393. What is ACL ?

Operating System

Ans. Access Control List or ACL is the list of permissions attached to an object in the File System.

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Q1394. Write a Program to delete a node from Linked List ?

Data Structure

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Q1395. Can we override an abstract method with abstract method in the derived class ?

Core Java

Ans. Yes, but in that case the derived class itself should be abstract. We cannot have an object of a class without definition for the method which has been declared abstract in the parent.

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Q1396. What is the difference between TimeBasedRollingPolicy and SizeBasedTriggeringPolicy within Log4j ? Can we use both together and What would that mean ?

Log4j

Ans. TimeBasedRollingPolicy enables rolling of logs based on the time / days whereas SizeBasedTriggeringPolicy enables rolling of logs based on size cap.

Yes we can use both together. In that case Logs will be rolled in case any of the condition is met i.e after the interval or if the size is reached.

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Q1397. What is the difference between RollingFile and RollingRandomAccessFile in log4j ?

Log4j

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Q1398. Can you organize following Log4j levels in hierarchy ?

WARN, DEBUG,INFO, ERROR

Log4j

Ans. DEBUG
INFO
WARN
ERROR

Root Log level of DEBUG will print all
Root Log Level of INFO will print INFO, WARN and ERROR
Root Log level of WARN will print WARN and ERROR
Root Log level of ERROR will print ERROR alone

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Q1399. What is the difference between DEBUG and TRACE logging levels ?

Log4j

Ans. TRACE designates finer grained informational events than the DEBUG.TRACE is level lower than DEBUG.

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Q1400. What is the use of Property files ?

Ans. Property files are used to maintain configurable values as key value pairs.

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Q1401. Given array of integers, find first two numbers that adds up to 10.

Core Java

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Q1402. Write a program to reverse words of a sentence.

Core Java

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Q1403. how to get most significant bit from a byte?

Core Java

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Q1404. What data structure will you use if we have to search an element in million of elements ?

Data Structure

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Q1405. Check if tic tac toe has a winner

Algorithm

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Q1406. Explain different sorting algorithms and Big O of each

Algorithm

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Q1407. Write a program to find loop in a linked list

Algorithm

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Q1408. What is RPM ?

Tool

Ans. Redhat Packaging system or rpm is a Package Manager or type of Package Management system extensively used for Linux systems.

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Q1409. What is Priority inversion ?

Operating System

Ans. Priority inversion is a problematic scenario in scheduling in which a high priority task is indirectly preempted by a lower priority task effectively inverting the relative priorities of the two tasks.

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Q1410. What is the difference between session.clear and session.evict ?

Hibernate

Ans. session.clear clears all the objects from session whereas session.evict is used for evicting a particular entity.

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