Java Programming Test (Random Questions)

Java Programming Test (Random Questions) - Computer Science & Engineering

Instruction:

This is a FREE online test. DO NOT pay money to anyone to attend this test.
Total number of questions : 20.
Time alloted : 30 minutes.
Each question carry 1 mark, no negative marks.
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All the best :-).

Which of the following components of the .NET framework provide an extensible set of classes that can be used by any .NET compliant programming language?

	A.	.NET class libraries
	B.	Common Language Runtime
	C.	Common Language Infrastructure
	D.	Component Object Model
	E.	Common Type System

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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Which of the following is the correct way to find out the index of the second 's' in the string "She sells sea shells on the sea-shore"?

	A.	Which of the following is the correct way to find out the index of the second 's' in the string "She sells sea shells on the sea-shore"? String str = "She sells sea shells on the sea-shore"; int i; i = str.SecondIndexOf("s");
	B.	String str = "She sells sea shells on the sea-shore"; int i, j; i = str.FirstIndexOf("s"); j = str.IndexOf("s", i + 1);
	C.	String str = "She sells sea shells on the sea-shore"; int i, j; i = str.IndexOf("s"); j = str.IndexOf("s", i + 1);
	D.	String str = "She sells sea shells on the sea-shore"; int i, j; i = str.LastIndexOf("s"); j = str.IndexOf("s", i - 1);
	E.	String str = "She sells sea shells on the sea-shore"; int i, j; i = str.IndexOf("S"); j = str.IndexOf("s", i);

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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According to ANSI specifications which is the correct way of declaring main when it receives command-line arguments?

	A.	int main(int argc, char *argv[])
	B.	int main(argc, argv) int argc; char *argv;
	C.	int main() { int argc; char *argv; }
	D.	None of above

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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What will be the output of the program?

class Equals
{
public static void main(String [] args)
{
int x = 100;
double y = 100.1;
boolean b = (x = y); /* Line 7 */
System.out.println(b);
}
}

	A.	true
	B.	false
	C.	Compilation fails
	D.	An exception is thrown at runtime

Your Answer: Option

Correct Answer: Option C

Explanation:

The code will not compile because in line 7, the line will work only if we use (x==y) in the line. The == operator compares values to produce a boolean, whereas the = operator assigns a value to variables.

Option A, B, and D are incorrect because the code does not get as far as compiling. If we corrected this code, the output would be false.

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A subquery in an SQL SELECT statement:

	A.	can only be used with two tables.
	B.	can always be duplicated by a join.
	C.	has a distinct form that cannot be duplicated by a join.
	D.	cannot have its results sorted using ORDER BY.

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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Which of the following is a valid format for mounting a CD-ROM drive?

	A.	mount -t iso9660 /dev/cdrom / mnt/cdrom
	B.	mount /dev/cdrom
	C.	mount /mnt/cdrom
	D.	All of the above
	E.	None of the above

Your Answer: Option

Correct Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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Updating a database means

	A.	revising the file structure
	B.	reorganizing the database
	C.	modifying or adding record occurrences
	D.	All of the above
	E.	None of the above

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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While working with MS-DOS, which command will you use to transfer a specific file from one disk to another?

	A.	DISKCOPY
	B.	COPY
	C.	RENAME
	D.	FORMAT
	E.	None of the above

Your Answer: Option

Correct Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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Which two of the following commands will place network 10.2.3.0/24 into area 0?

router eigrp 10
router ospf 10
network 10.0.0.0
network 10.2.3.0 0.0.0.255 area0
network 10.2.3.0 0.0.0.255 area 0

	A.	1 and 4
	B.	2, 4, and 5
	C.	2 and 5
	D.	3 and 4

Your Answer: Option

Correct Answer: Option C

Explanation:

To enable OSPF, you must first start OSPF using a Process ID. The number is irrelevant; just choose a number from 1 to 65,535 and you're good to go. After you start the OSPF process, you must configure any network that you want advertised via OSPF using wildcards and the area command. Statement (4) is wrong because there must be a space after the parameter area and before you list the area number.

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10.

What does the command o/r 0x2142 provide?

	A.	It is used to restart the router.
	B.	It is used to bypass the configuration in NVRAM.
	C.	It is used to enter ROM Monitor mode.
	D.	It is used to view the lost password.

Your Answer: Option

Correct Answer: Option B

Explanation:

The default configuration setting is 0x2102, which tells the router to load the IOS from flash and the configuration from NVRAM. 0x2142 tells the router to bypass the configuration in NVRAM so that you can perform password recovery.

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11.

Which of the following modifications may not succeed?

	A.	Changing a column data type from char to date
	B.	Changing a column data type from numeric to char
	C.	Both of the above actions should succeed.
	D.	Neither of the above actions will succeed.

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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12.

Routers are often used to implement FIREWALLS

	A.	True
	B.	False

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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13.

The DBMS acts as an interface between what two components of an enterprise-class database system?

	A.	Database application and the database
	B.	Data and the database
	C.	The user and the database application
	D.	Database application and SQL

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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14.

A rule of thumb for choosing indexes for a relational database includes which of the following?

	A.	Indexes are more useful on smaller tables.
	B.	Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
	C.	Do not specify a unique index for the primary key of each table.
	D.	Be careful indexing attributes that have null values.

Your Answer: Option

Correct Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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15.

The use of the break statement in a switch statement is

	A.	optional
	B.	compulsory
	C.	not allowed. It gives an error message
	D.	to check an error
	E.	None of the above

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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16.

Conversion of an octal number 112 8 to hexadecimal number is

	A.	4A 16
	B.	5A 16
	C.	15 16
	D.	20 16
	E.	None of the above

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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17.

An SQL Server 2000 language that adds programming elements like parameters, variables, IF, WHILE loops, and so forth, to the basic capabilities of SQL is called:

	A.	COBOL.
	B.	VB.NET.
	C.	TRANSACT SQL.
	D.	Visual Basic.

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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18.

Slack is the calculated time span within which the event must occur:

	A.	true
	B.	false
	C.	cannot be said
	D.	All of the above
	E.	None of the above

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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19.

Which of the following statements about virtual base classes is correct?

	A.	It is used to provide multiple inheritance.
	B.	It is used to avoid multiple copies of base class in derived class.
	C.	It is used to allow multiple copies of base class in a derived class.
	D.	It allows private members of the base class to be inherited in the derived class.

Your Answer: Option

Correct Answer: Option B

Explanation:

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20.

Which of the following header file includes definition of cin and cout?

	A.	istream.h
	B.	ostream.h
	C.	iomanip.h
	D.	iostream.h

Your Answer: Option

Correct Answer: Option D

Explanation:

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