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Q1441. Explain dot(.) operator ?

Ans. Its used to access the object properties using the object reference or class properties using the Class Name. Moreover its used to access the classes and Interfaces of a package.

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Q1442. How should we handle errors while writing or accessing Stored Procedures?

Database

Ans. Store Procedure returns the error code. Moreover we can put the call withing try block and catch SQL Exception.

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Q1443. Does Java supports Default arguments ?

Core Java

Ans. No

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Q1444. Can we have only try block in java ?

Core Java

Ans. No, It should be followed by either catch or finally.

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Q1445. What is memory leak ? How Java helps countering memory leaks compared to C++ ?

Core Java

Ans. Memory Leak is a situation wherein we have a reserved memory location but the program has lost its reference and hence has no way to access it.

Java doesn't have concept of Pointers, Moreover Java has concept of Garbage collection that frees up space in heap that has lost its references.

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Q1446. Write an algorithm / java program for Heap Sort ?

Algorithm

Ans. https://www.geeksforgeeks.org/heap-sort/

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Q1447. What are the similarities and differences between Scala and Java ?

Scala

Ans. Similarities - Both and Object Oriented and Statically typed languages that runs on JVM.

Difference - Unlike Java, Scala is a Pure Object Oriented language as it doesn't use primitives and static variables.Unlike Java 8 which supports some functional programming concepts, Scala provides support for all functional programming concepts. Java 8 does not support Pattern Matching, Function Currying etc

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Q1448. What is Scala ?

Scala

Ans. Scala is a general purpose programming language that runs on JVM. Its completely inter operable with Java, purely object oriented and has full support for functional programming and a strong static type system.

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Q1449. Does Scala code compile to be Java Byte Code ?

Scala

Ans. Yes, that's the reason Scala code is inter operable with Java and they run smoothly with each other in JVM.

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Q1450. What are some advantages of Scala ?

Scala

Ans. Scala code is more concise and hence easy to read and maintain. It supports all features of functional programming and provide a pure object oriented way of application creation. It is ideal for creating all scales of applications. It is inter operable with Java code and hence can import / use Java libraries and frameworks.

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Q1451. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?

Hibernate

Ans. Make sure that the properties of dependent Hibernate entities are not accessed and if yes, better wrap the whole code within single transaction.

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Q1452. How does Lazy Initialization helps improving performance of an application ?

Hibernate

Ans. Lazy Initialization means , Load Dependencies when required. Which means less load on application resources as only required data is loaded upfront. It's not only good for better performance but for better resource utilization too.

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Q1453. What are the benefits of creating immutable objects ?

Core Java

Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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Q1454. Can you name some of the Java frameworks in different domains ?

Frameworks

Ans. Web Framework - Spring , Struts, Play
Dependency Injection frameworks - Google Guice , PicoContainer and Dagger
ORM Framework - Hibernate
Big Data / ETL Frameworks - Apche Hadoop , Apache Crunch, Apache Spark.
View Frameworks - JSF , Apache Wicket,jtwig.
Java Gui Frameworks - SWT , AWT, JavaFX
Testing - Junit, Mockito, PowerMock, EasyMock, JMock, JMockit
Rest Web services - Jersey , Restlet , RestX, RestEasy ,Restfulie

Here is the big list for reference - http://javasearch.buggybread.com/home2.php?keyword=

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Q1455. What is the difference between

File f = new File("homexyz.txt");

and

File f = File.createTempFile("xyz",".txt","home"); ?

Core Java

Ans. First will not create physical file in storage whereas the second will.

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Q1456. What are the different J2EE modules ?

Java EE

Ans. 1. Application Client Module
2. Web Module
3. EJB
4. Resource Adapter

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Q1457. What does the Web module contains ?

Java EE

Ans. JSP files, media files and deployment descriptor ( web.xml )

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Q1458. What is an applet ?

Core Java

Ans. Applet is a J2EE component or a tiny application that gets executed in a widget engine ( like browser )

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Q1459. What is archiving ?

Process

Ans. It's the process of preserving the state of an object and then restoring it.

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Q1460. What are callback methods ?

Core Java

Ans. Component methods called by the container to notify the component of the events

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Q1461. What is fulfillment center ?

ECommerce

Ans. Fulfillment center or Delivery Center is the store or warehouse from where the actual delivery of merchandise takes place.

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Q1462. What is cascade or cascading delete ?

Process

Ans. A deletion that triggers another deletion

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Q1463. What is a certificate authority ?

Security

Ans. A trusted organization which issues public key certificates and provides identification to the bearer.

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Q1464. How and Why Strings are interned in Java ?

Core Java

Ans. String class has a public method intern() that returns a canonical representation for the string object. String class privately maintains a pool of strings, where String literals are automatically interned.

these are automatically interned so as to have efficient String comparison using == operator instead of equals which is usually slower.

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Q1465. How Access control Policies are implemented in WCS ?

IBM WCS

Ans. There are three elements i.e Users ( Who want access ) , Actions ( What kind of Access ) and Resources ( Whose Access ). The relationship between resource and user is store in ACRELATION table and ACRESREL associate a resource and relationship.

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Q1466. What are the tables used for Access control ?

IBM WCS

Ans. ACPOLICY , ACPOLDESC , ACACTION , ACRELATION , ACRESREL , ACRESGRP

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Q1467. Who manages the Access control policies and How ?

IBM WCS

Ans. Site Administrator and through Org Admin Console.

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Q1468. What are the design patterns used in WCS ?

IBM WCS

Ans. MVC , Display Design and Command.

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Q1469. What is reload interval and where it is defined ?

IBM WCS

Ans. reload interval or jsp caching interval is a parameter that indicates how frequently a JSP should be recompiled.

It is defined within

Stores.warWEB-INFibm-web-ext.xmi

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Q1470. What information is stored in CACHEIVL table and How does this help in caching ?

IBM WCS

Ans. This table records the changes to product or category information in the database. This is referred by WCS for invalidating dynacache.

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