Interview Questions and Answers for 'T' | Search Interview Question

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Q1381. What was the worst problem you faced while working with Hibernate ?

Hibernate

Ans. Lazy Initialization exceptions

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Q1382. 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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Q1383. 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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Q1384. 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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Q1385. 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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Q1386. 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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Q1387. 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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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 the precedence of operators in Java ?

Core Java

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

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Q1391. 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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Q1392. 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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Q1393. Write a Program to delete a node from Linked List ?

Data Structure

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Q1394. 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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Q1395. 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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Q1396. 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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Q1397. how many reducer task runs on a hadoop cluster ?

BigData

Ans. Generally one reducer runs for all mappers, but it can be increased as per requirements.

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Q1398. What is the use of Property files ?

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

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Q1399. Difference between Mutex and Semaphore?

Operating System

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Q1400. Explain process life cycle.

Operating System

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Q1401. What is an Operating system or OS ?

Operating System

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Q1402. What is thrashing?

Operating System

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Q1403. Explain bubble sort.

Algorithm

Ans. array is traversed from first element to last element. Here current element is compared with next element. If current element is greater than next element it is swapped.

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Q1404. Write code to check if a Binary tree is symmetrical

Algorithm

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Q1405. What data structure will you use if we have to search an element in million of elements ?

Data Structure

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Q1406. Write a function that returns the depth of a tree.

Algorithm

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Q1407. Write code to find the node where two linked lists intersect.

Algorithm

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Q1408. Check if tic tac toe has a winner

Algorithm

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Q1409. Write program to balance a binary tree

Algorithm

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Q1410. Given a graph, find if it represents a tree

Algorithm

Ans. We can simply find it by checking the criteria of a tree. A tree will not contain a cycle, so if there is any cycle in the graph, it is not a tree. We can check it using another approach, if the graph is connected and it has V-1 edges, it could be a tree. Here V is the number of vertices in the graph

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