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Q2371. Which is better in terms of performance - Iterator or Spliterator ?

Ans. Spliterator has better performance potential than iterators but only if the potential is used. Spliterator can iterate streams in parallel as well as in sequence whereas iterator can only iterate in sequence.

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Q2372. How Spliterator in Java 8 different than iterator ?

Core Java

Ans. Though there are many differences the way internally they both iterates the collections and streams respectively, but the main difference in performance that is achieved by spliterator as it can iterate Streams in Parallel whereas iterator only iterates collections sequentially.

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Q2373. Write a Java Program to check Armstrong Number ?

Core Java

Ans. http://www.programmingsimplified.com/java/source-code/java-program-armstrong-number

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Q2374. What is Java NumberFormatException ?

Core Java

Ans. NumberFormatException is the exception that Java throws when we try to convert one data type to the Number data type but the value is not parsable to be a Number.

For example , the following code will result in the NumberFormatException

String string = "Buggy";
int strtoInt = Integer.parseInt(string);

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Q2375. What is the use of @Before annotation ?

Junit

Ans. When executing tests it is common that multiple tests need similar objects to be created before they can run. @before specifies a method that provide that initialization for the set of Unit Tests.

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Q2376. Have you ever heard of InstanceAlreadyExistsException ?

Core Java

Ans. This exception usually occur if we try to register the bean with name already present in the registry or repository. Usually this happens when multiple tests are executed at once in single container.

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Q2377. What are the primitive data types in Java ?

Core Java

Ans. boolean byte char double float int long short void

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Q2378. Explain Travelling SalesMan Problem ?

Algorithm

Ans. https://en.wikipedia.org/wiki/Travelling_salesman_problem

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Q2379. What is a responsive web design ?

Design

Ans. Responsive web design is a approach to web design that allow desktop webpages to be viewed perfectly in different devices and sizes.

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Q2380. Can we declare a member element as abstract ?

Core Java

Ans. No, only methods can be declared abstract.

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Q2381. Can we modify the variables defined in an interface ?

Core Java

Ans. No, member variables of a interface are final by default. The final ensures the value assigned to the interface variable is a true constant that cannot be re assigned by program code.

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Q2382. If we parse any string to get another data type and the String doesn't abide by the type of data it should have hold, what would happen ?

Core Java

Ans. It will throw Parse Exception.

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Q2383. What different level of logging you use while coding ?

Logging

Ans. I use trace for debugging purpose. Info for displaying some important info, thought its rare as we have enabled info logging in production. Warn in case something went wrong but we still resume the flow in spite of it or have take alternate flow as its expected sometimes. Error logging in case it was completely unexpected and mostly when it breaks the flow.

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Q2384. Why calculations in float or Double sometimes gives unpredictable results ?

Core Java

Ans. Because the way float values are stored its not precise.

For example - 0.1 is actually stored as
0.1000000000000000055511151231257827021181583404541015625

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Q2385. Can you please provide an implementation of application level cache ?

Design

Ans. We can use an expiration map whose entries gets expired after a certain interval and then we can put the logic to retrieve the entries if its expired in map. Alternatively we can create a separate class and make map its element. We can refresh the map in this class periodically by using a monitoring thread within static block.

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Q2386. how can we get the System Environment variables from within Java program ?

Core Java

Ans. We can use System.getenv for getting the environment variables. For ex - System.getenv("JAVA_HOME")

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Q2387. How to check the version of Java through Java program itself ?

Core Java

Ans. We can use System.getProperty("java.version");

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Q2388. How can you check if a String is a 10 digit number by using regular expression ?

Core Java

Ans. We can use \d{10} as the expression to check that

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Q2389. How can we catch an exception thrown by another thread ?

Core Java

Ans. http://stackoverflow.com/a/6548203/2789764

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Q2390. How can we find the memory usage of JVM from Java code?

Core Java

Ans. Using Runtime object.

Runtime runtime = Runtime.getRuntime();

runtime.totalMemory();
runtime.freeMemory();

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Q2391. Is ++ or -- operation thread safe in Java ?

Core Java

Ans. No

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Q2392. How can one determine if JVM is 32-bit or 64-bit from Java Program ?

Core Java

Ans. There is a Java system property "sun.arch.data.model" that can tell if JVM is 32 bit of 64 bit

System.getProperty("sun.arch.data.model") can be used to get that property.

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Q2393. What is coupling and Cohesion ?

Design

Ans. Coupling is the degree of interdependence between software modules, a measure of how closely connected two modules are or the strength of the relationships between modules.

Cohesion refers to the degree to which the elements of a module belong together. Cohesion measures the strength of relationship between pieces of functionality within a given module.

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Q2394. Watching a directory for changes. Monitoring a directory.

Core Java

Ans. http://www.logicbig.com/tutorials/core-java-tutorial/java-nio/java-watch-service/

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Q2395. Have you ever tried compressing data using Java ?

Core Java

Ans. Yes, we can use ZipInputStream class for compressing the FileInputstream object.

Sample Code for ZipInputStream

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Usually asked with Questions related to Generics.

Q2396. What are Type Erasures in Java ?

Core Java

Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts.

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Q2397. Is it a Good practice to have application decision making in DAOs ?

Design

Ans. No, DAO's should only have methods to perform CRUD operations. Application logic should reside in service methods.

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Q2398. Have you ever felt the need of keeping the constructor private ?

Design

Ans. Yes, When either we don't want an object to be created ( class having all static elements and hence not required ) or object to be created using a static method or static block. One such example could be a situation when we would like app to load objects at start up and we would like to restrict new object creation by any request.

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Q2399. How do you prefer to store money values in your application ?

Core Java

Ans. At Application level we use either Double or BigDecimal , preferably BigDecimal. At Database level we use Number with decimal precision 3.

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Q2400. What is difference between Product and Item ?

IBM WCS

Ans. Item is a sale-able merchandise where as Product is a group of sale-able merchandise which share certain attributes. For example - Cell phone is a product whereas Samsung Galaxy S2 - White is an item.

Quantity is always attached to SKU ( Stock keeping unit ) or items. Product quantity has no relevance in terms of identify the current stock or reorder condition.

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