SkillNet Development Pre-interview Assessment

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Given Two Files

What will be the output?

"5 7"

"5 6 7"

The field Foo.a is not visible

The field Foo.b is not visible

Assume that the following classes are all in the same package.

Which of the following are valid examples of Java extensions or implementations given the following java files?

Which of the following allows you to migrate you implementations over time without breaking the code that depends on the public interface of your classes?

Polymorphism

Encapsulation

Inheritance

Both Encapsulation and Polymorphism

The following two rules define what type of coding usage?

1. The parameters may differ in their type, number or both.

2. They may have the same of different return types.

Method overloading

Method overriding

Constructor overloading

Class Extensions

Which access specifier(s) can be used on a class members so they can be accessed by a different class in a different package?

Private

Protected

Public

Which of the following statements about arrays is true?

An array holds only one type of data

An array can only hold primitive data types.

Java array sizes must be declared at compile time.

Java arrays contain accessible pointers to their first element and last elements.

Java empty array elements contain "/n" by default.

What will be output if you run the following code:

Default,

Compilation Error

Default,0,1,

What will be output if you run the following code:

"New File Created"

"General exception caught"

"IOException exception caught"

Compilation Error

Which of the following statements are true about finalize()?

It is possible for objects, on whom finalize has been invoked by the JVM, to avoid garbage collection.

For a specific object, it is not possible for finalize() to be invoked more than once.

Overriding finalize() ensures that objects of that type will always be garbage collected by the JVM when they become eligible

Finalize() is not a valid Java function.

What will be output if you run the following code:

Compilation Error

Run-time Error

What will be output if you run the following code:

A B C D E 4 [D, B, C, E]

Compilation Error

Run-time Error

B C E 3 [B, C, E]

Given these two classes:

Which method override(s) for "runMe" is/are valid in class Bar?

Public int runMe () {}

Public void runMe () {}

Public void runMe () throws FileNotFoundException {}

Public void runMe throws Exception {}

Private void runMe throws IOException {}

In SQL, What is the proper keyword to put together data sets from two different tables?

Combine

Join

Select

Concat

What is the proper syntax to count the number of rows in the following table, STUDENTS, where STUDENT_ID is the primary key?

Select ROWNUM from STUDENTS

Select count(*) from STUDENTS

Select count(STUDENT_ID) from STUDENTS

Count STUDENT_ID from STUDENTS

What would be added to the previous answer if we needed to count only the CS majors?

DISTINCT COUNT()

WHERE MAJOR = "CS"

WHERE MAJOR = 'CS'

ONLY MAJOR = "CS"

What SQL keyword can remove results from a result set?

REMOVE

NOT IN

EXCLUDING

ONLY

in SQL, when adding a row to a table, the statement must include both the column to populate and the values for each column.

True

False

What is the correct SQL keyword if a developer wanted to order the SQL results by more recent date?

UPPER

DESC

ASC

LOWER

Java programs perform I/O through what?

Java built in I/O methods

I/O packages

Streams

'out' and 'in' methods

Which of the following transaction management properties defines that either all changes made by a transaction to a database are successfully updated, else all changes are rolled back?

Atomicity

Consistency

Finalize

Transactional

In SQL, relying a column from another table to validate the entries for a column in a separate tables is called a?

Foreign Key

Joined Key

Primary Key

This is not allowed in SQL

SkillNet Development Pre-interview Assessment

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