Explore topic-wise InterviewSolutions in .

Correct option is (b) for(INT i=99; i>=0; i–)

The BEST I can EXPLAIN: reverse traversal of array take HALF number cycles as COMPARED to forward traversal. The other for loops will go in infinite loop.

Right answer is (a) variable names should be short

To explain I would say: variable names LIKE i, a, abc, etc should be avoided. They should be real world names which AVOID ambiguity. TEST case name should explain its significance.

Right CHOICE is (a) Array

For EXPLANATION I would say: Array list has VARIABLE size. Array is stored in contiguous memory. Hence, reading is faster. ALSO, array is memory efficient.

Right OPTION is (c) The class should only contain those attribute and functionalitywhich it should; hence KEEPING it short

For explanation I WOULD say: Class name should always start with upper case and contain those attribute and functionality which it should (Single Responsibility Principle); hence keeping it short. The attributes should be USUALLY private with get and set methods.

Right ANSWER is (B) System.nanoTime()

The best explanation: System.nanoTime takes AROUND 1/100000 TH of a second WHEREAS System.currentTimeMillis takes around 1/1000th of a second.

Right OPTION is (b) EMPTY COLLECTION

Explanation: Returning Empty collection is a GOOD practice. It eliminates chances of UNHANDLED null pointer exceptions.

The correct option is (b) .HBM

The best I can explain: Database table CONFIGURATION is stored in .hbm FILE.

The CORRECT answer is (a) parent class can be substituted by child class

Explanation: Liskov substitution principle states that Objects in a program should be REPLACEABLE with instances of their SUB types without ALTERING the correctness of that program.

The CORRECT OPTION is (d) Table PER CLASS

For explanation: Table per class is not an inheritance mapping strategies.

Correct choice is (d) GET()

The explanation is: get() method hits DATABASE ALWAYS. Also, get() method does not return proxy OBJECT.

The CORRECT option is (C) createSymbolicLink()

To explain: createSymbolicLink() creates a SYMBOLIC link to a TARGET.

Correct ANSWER is (a) Files.readAllLines()

The best explanation: Java 8 provides Files.readAllLines() which allows us to READ entire file in ONE task. We do not NEED to worry about READERS and writers.

Right option is (b) apache commons

For explanation I would SAY: FileUtils is a part of apache commons which PROVIDES various methods for file OPERATIONS LIKE writeStringToFile.

Right answer is (b) SIZE(PATH)

Easiest explanation: size(Path) RETURNS the size of the specified FILE in BYTES.

The correct OPTION is (a) Files.delete(PATH)

Easy explanation: The delete(Path) method deletes the file or THROWS an EXCEPTION if the deletion FAILS. If file does not exist a NoSuchFileException is thrown.

Right answer is (a) Files.COPY(source, target)

The explanation is: Files.copy(source, target) is used to copy a file from one LOCATION to another. There are VARIOUS options available like REPLACE_EXISTING, COPY_ATTRIBUTES and NOFOLLOW_LINKS.

The CORRECT OPTION is (d) isReadable(PATH), isWritable(path), and isExecutable(path)

To ELABORATE: FILE accessibilty can be checked usingisReadable(Path), isWritable(Path), and isExecutable(Path).

The CORRECT ANSWER is (c) Files.createDirectory(path, FILEATTRIBUTES)

EASIEST explanation: New directory can be created USING Files.createDirectory(path, fileAttribute).

Correct choice is (a) Nashorn

Best explanation: Nashorn provides 2 to 10 TIMES FASTER in terms of performance, as it directly COMPILES the code in memory and passes the bytecode to JVM. Nashorn USES invoke dynamic feature.

The correct option is (B) NEWWORKSTEALINGPOOL

For explanation: Executors newWorkStealingPool() method to create a work-stealing THREAD pool using all available processors as its target PARALLELISM level.

The CORRECT CHOICE is (a) sequential and parallel

The best explanation: Sequential stream and parallel stream are two types of stream provided by JAVA.

Correct ANSWER is (C) StringList.forEach()

For EXPLANATION: TRAVERSING through forEach method of Iterable with anonymous CLASS.

Correct answer is (d) Function

To explain: LAMBDA expression ENABLES us to pass FUNCTIONALITY as an argument to another method, such as what action should be taken when someone CLICKS a button.

The correct option is (d) MockJava

Explanation: EASYMOCK, jMock, Mockito, Unitils MOCK, PowerMock and JMockit are a VARIOUS MOCKING FRAMEWORK.

The correct OPTION is (c) @Junit

Best explanation: @Test is USED to ANNOTATE method under test, @BeforeEach and @AfterEach are CALLED before and after each method respectively. @BeforeClass and @AfterClass are called only once for each CLASS.

The correct option is (a) UNIT Testing

For explanation I would say: JUNIT is a testing FRAMEWORK for unit testing. It uses java as a PROGRAMMING platform. It is managed by junit.org community.