Tag: technology

Questions Related to technology

Given: 10. interface Foo {} 11. class Alpha implements Foo { } 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?
technology programming languages

  1. Alpha a = x;

  2. Foo f= (Delta)x;

  3. Foo f= (Alpha)x;

  4. Beta b = (Beta)(Alpha)x;

Show answer
Correct Option: B

Given That: 10. interface Foo {} 11. class Alpha implements Foo { } 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?
technology programming languages

  1. Alpha a = x;

  2. Foo f= (Delta)x;

  3. Foo f= (Alpha)x;

  4. Beta b = (Beta)(Alpha)x;

Show answer
Correct Option: B
Explanation:

To solve this question, the user needs to know about inheritance in Java and how casting works. The key to answering this question correctly is understanding how casting works between different classes in an inheritance hierarchy.

Now, let's go through each option and explain why it is right or wrong:

A. Alpha a = x; - This code is valid because Beta is a subclass of Alpha, so it can be upcast to an Alpha without issue. This will not cause a ClassCastException.

B. Foo f= (Delta)x; - This code is invalid because Delta is a subclass of Beta, so it cannot be downcast to Delta from Beta. This will throw a ClassCastException.

C. Foo f= (Alpha)x; - This code is valid because Beta is a subclass of Alpha, so it can be upcast to an Alpha without issue. This will not cause a ClassCastException.

D. Beta b = (Beta)(Alpha)x; - This code is invalid because Alpha is a superclass of Beta, so it cannot be downcast to Beta from Alpha. This will throw a ClassCastException.

Therefore, the correct answer is:

The Answer is: B

AUTONOMUS_TRANSACTION is a

technology databases

  1. Programming technique

  2. Automatically used in all prpgramme

  3. PL/SQL compiler directive

  4. All of the above

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Correct Option: C

PACK_MESSAGE is used in
technology databases

  1. queeing

  2. piping

  3. Autonomus transaction

  4. Host I/O

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Correct Option: B

What is the command used to encrypt a PL/SQL application
technology databases

  1. ENCRYPT

  2. DECRYPT

  3. WRAP

  4. UNWRAP

Show answer
Correct Option: C

Which is true for ROWID% data type
technology databases

  1. Binary data upto 4GB

  2. Character data upto 4 GB

  3. A hexadecimal string representing the unique address of a row in its table

  4. Binary data stored in an external file

Show answer
Correct Option: C
Explanation:

To solve this question, the user needs to know about the ROWID data type in databases.

The ROWID is a pseudo column added by Oracle to all tables, which stores the row's unique identifier. The ROWID is represented in hexadecimal format, and it uniquely identifies each row in a table.

Now, let's go through each option and explain why it is right or wrong:

A. Binary data upto 4GB: This option is incorrect because ROWID is not a data type that stores binary data.

B. Character data upto 4 GB: This option is incorrect because ROWID is not a data type that stores character data.

C. A hexadecimal string representing the unique address of a row in its table: This option is correct. The ROWID data type stores a hexadecimal string that represents the unique address of a row in its table.

D. Binary data stored in an external file: This option is incorrect because ROWID is not a data type that stores binary data in an external file.

The Answer is: C

SELECT ROUND(TRUNC(MOD(1600,10),-1),2)
technology databases

  1. ERROR

  2. 0

  3. 1

  4. 0.00

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Correct Option: B

The default SAP AS Java communication ports for dispatcher and server process meet which of the following requirements:
technology packaged enterprise solutions

  1. The port value can be any number.

  2. For each cluster element the ports begin with 50000+100*instance_number, where instance_number is a two digit number from 00 to 99 specifying the number of central instance and dialog instances.

  3. For each cluster element the ports begin with 50000+instance_number, where instance_number is a two digit number from 00 to 99 specifying the number of central instance and dialog instances.

  4. The port value is a number over 50000

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Correct Option: B,D

Default SDM (Software Deployment Manager) port on central instance number 01 is
technology packaged enterprise solutions

  1. 3918

  2. 50018

  3. 50118

  4. 50180

Show answer
Correct Option: C

Default internal Message Server port for Central Services Instance on instace number is
technology packaged enterprise solutions

  1. 3NN9

  2. 39NN

  3. 3NN1

  4. 5NN01

Show answer
Correct Option: B