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

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Q281. How executor service is better than using primitive Threading mechanism using Thread class or runnable Interface ?

Core Java

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Q282. How does encoding affect using Reader / writer classes or Stream classes in Java ?

Core Java

Ans. Which group of bytes represent which character is defined by character encoding. So when reading character by character from a stream of bytes using Reader, specifying character encoding becomes significant as the same group of bytes can represent different character in different character encoding(Eg UTF-8 and UTF-16 etc.)

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Q283. How do you debug Javascript code ?

JavaScript

Ans. Possible Answer - I use either Firebug or Chrome Developer tool.

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Q284. What is the difference between Java OR operator and Java script OR operator ?

JavaScript

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Q285. Can you name few Java packages which you frequently used ?

Core Java

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Q286. is Java top down programming language or bottom up programming language?

Core Java

Ans. bottom up programming language

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Q287. Write Java code that would cause deadlock ?

Core Java

Ans. https://howtodoinjava.com/java/multi-threading/writing-a-deadlock-and-resolving-in-java/

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Q288. how is the internal code for the "volatile" implemented ?

Core Java

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Q289. Can methods without a return type be declared in Java? Is there a difference between void return type and no return type ?

Core Java

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Q290. What is the default execution method in Java?

Core Java

Ans. public static void main(String[] args)

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Q291. What will happen if there is an exception in Java finally block ?

Core Java

Ans. The regular behavior of exception handling will occur. It will look for any immediate catch handler and if none is provided, it would be transmitted to the callers until a catch handler is found or it's out of main function.

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Q292. Difference between final and finally

Core Java

Ans. final can be used for variables , methods and class. A final variable cannot be changed , a final method cannot be overridden , a final class cannot be inherited.

Finally is a block which is used after Try and catch, a finally block is always executed.

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Q293. Tell about shallow and deep cloning ?

Core Java

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Q294. Difference between 32 bit and 64 bit JVM ?

Core Java

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Q295. How do we do Inheritance in Java ?

Core Java

Ans. By extending class or implementing interface.

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Q296. What is Dynamic Binding ?

Core Java

Ans. Dynamic Binding happens at runtime. Method overriding is an example of Dynamic Binding

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Q297. Which is the best collections for maintaining elements in an order ?

Core Java

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Q298. Which statement is used to exit a function in java script ?

JavaScript

Ans. return

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Q299. How can java script access a database ?

JavaScript

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Q300. what is event handler script ?

JavaScript

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Q301. what is directive ?

Core Java

Ans. A compiler directive is an instruction that tells the JVM how compilation should occur. A directive provides method-context precision in controlling the compilation process.

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Q302. can we use null as keyword ?

Core Java

Ans. null is a literal similar to true and false in Java. These are not keywords because these are the values of something. As null is the value of a reference variable, true is the value of a boolean variable.

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Q303. Sort a List of Objects using comparable and comparator

Core Java

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Q304. What are the drawbacks of Reactive extensions ?

ReactiveX

Ans. Reactive extensions have a steep learning curve which makes it confusing for beginner and intermediate developers.

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Q305. Difference between concatMap and flatMap ?

RxJava

Ans. Flatmap converts stream(s) into a single streams without maintaining a order where as concatmap does the same along with maintaining the order

flatmap example -[[1,2,3],[4,5,6],[7,8,9]] -> [1,4,7,2,5,8,3,6,9]

concatmap example -[[1,2,3],[4,5,6],[7,8,9]] -> [1,2,3,4,5,6,7,8,9]

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Q306. What is the difference between subscribe and blockingSubscribe method ?

RxJava

Ans. blockingSubscribe will block the current thread and wait till the chain completes

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Q307. What is the difference between subject and observable ?

RxJava

Ans. Subject has state, it keeps a list of observers. On the other hand, an Observable is really just a function that sets up observation. While Subjects are Observables, Subjects also implement an Observer interface.

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Q308. What is the difference between Observer and Observable ?

RxJava

Ans. Observable is emiting data and Observer is subscribing to catch the data

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Q309. Which of the Core Java functions / packages / concept do you believe have become irrelevant in today's market ?

Core Java

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Q310. What is the difference between round and scale method of BigDecimal ?

Core Java

Ans. Round method would round it to integer places irrespective of if it's decimal places or not whereas scale would only round the decimal places.

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