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

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Q601. Is this array declaration correct ? If not , Why ?

String[] strArray = new String[];

Core Java

Ans. No, We haven't specified the size of array to be initialized.

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Q602. Have you heard of volatile Table in Teradata ?

Teradata

Ans. If you create table with VOLATILE option, the life of the table will be only for the current session.
It will be automatically dropped by Teradata manager once session expires.

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Q603. What is your daily work schedule ?

General

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Q604. What is the difference between log4j and java logging api.

Log4j

Ans. log4j is by apache while java logging api is given by sun. log4j is more powerful,extensible and simple to use than java logging api.

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Q605. Have you worked with Data Feeds ?

General

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Q606. Have you ever worked on migrating AWS services and databases from one account to another ?

Amazon Web Services (AWS)

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Q607. Which memory segment holds the byte code ?

Core Java

Ans. Code Segment

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Q608. Can we call a static method using reference currently pointing to null.

Core Java

Ans. yes, we can.
exa: public class Java{
public static void main(String... args) {
JAva j= null;
j.greeting(); // call with null reference
}
public static void greeting() {
System.out.println("Hello World");
}
} // output: Hello World

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Q609. How to run jar file using command prompt

Core Java

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Q610. Diff between Runtime.getRunTime().gc() and System.gc()

Core Java

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Q611. Which jar files need to be included for using Hibernate ?

Hibernate

Ans. hibernate-orm
hibernate-validator
hibernate-ogm
hibernate-search

or you can download hibernate core with all dependencies.

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Q612. What is the use of sql dialect ?

Hibernate

Ans. Dialect means "the variant of a language".

Similarly in case of SQL Dialect we specify what dialect of SQL to be generated keeping in mind of underlying database.

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Q613. Tell something about Sleep method.

Core Java

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Q614. Which Java version supports Interface Default methods ?

Core Java

Ans. Java 1.8 or Java 8

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Q615. Write a program to insert a value after a specific value in an array.

Data Structure

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Q616. Can we make array volatile in Java ?

Core Java

Ans. Yes, you can make an array (both primitive and reference type array e.g. an int array and String array) volatile in Java but only changes to reference pointing to an array will be visible to all threads, not the whole array

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Q617. Can we declare an array without assigning the size of an array?

Core Java

Ans. No, It will throw compile time error saying "must provide either dimension expressions or an array initializer"

Alternatively we can provide array initializer like

String[] strArray = new String[]{"Buggy","Bread"};

which will initialize it to size 2 with values as "Buggy" and "Bread"

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Q618. Find the length of the non repeated numbers in an array.

Data Structure

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Q619. Find number of recycled pairs in n array.

Data Structure

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Q620. Given a max-heap represented as an array, Return the n th largest element without modifying the heap.

Algorithm

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Q621. In an array every element is repeated twice except one, Find that element?

Data Structure

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Q622. What is the ideal situation / case for using heap sort ?

Algorithm

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Q623. Difference between Arrays and LinkedList ?

Data Structure

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Q624. Difference between Arrays and ArrayList ?

Core Java

Ans. Both Arrays and ArrayLists are used to store elements. Elements can be either primitives or objects in case of Arrays, but only objects can be stored in Arraylist. Array is a fixed length data structure while arraylist is variable length collection class. Once created, you cannot change the size of the arrays, but arraylists can dynamically resize itself when needed.Another notable difference between Arrays and Arrayslist is that arary is part of core java programming and array list is part of collection classes

Sample Code for arrays arraylist

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Q625. Can you write code to copy one array into another ?

Data Structure

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Q626. What is ArrayStoreException ?

Core Java

Ans. It's an exception that is thrown when we attempt to add value of an incompatible type to an array.

For example -

Object[] strArray = new String[2];
strArray[0] = 5;

In this code, strArray reference of type Object has currently been assigned the String array but at line 2 we are trying to add an integer value.

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Q627. What is the difference between ArrayIndexOutOfBoundException and ArrayStoreException?

Core Java

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Q628. Does Java generate .class file for interfaces ?

Core Java

Ans. Yes

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Q629. Can we declare an Interface with abstract keyword ?

Core Java

Ans. Yes

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Q630. Can we declare constructor inside an interface ? Why ?

Core Java

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