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programming languages Online Quiz - 212

Description: programming languages Online Quiz - 212
Number of Questions: 20
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Tags: programming languages
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Given: class Alien { String invade(short ships) { return "a few"; } String invade(short... ships) { return "many"; } } class Defender { public static void main(String [] args) { System.out.println(new Alien().invade(7)); } } What is the result?
technology programming languages

  1. many

  2. a few

  3. Compilation fails.

  4. An exception is thrown at runtim

Show answer
Correct Option: C

Given: class Eggs { int doX(Long x, Long y) { return 1; } int doX(long... x) { return 2; } int doX(Integer x, Integer y) { return 3; } int doX(Number n, Number m) { return 4; } public static void main(String[] args) { new Eggs().go(); } void go () { short s = 7; System.out.print(doX(s,s) + " "); System.out.println(doX(7,7)); } } What is the result?

technology programming languages

  1. 1 1

  2. 2 1

  3. 3 1

  4. 4 1

  5. 2 3

  6. 4 3

Show answer
Correct Option: F

Given: class Mixer { Mixer() { } Mixer(Mixer m) { ml = m;} Mixer m1; public static void main(String[] args) { Mixer m2 = new Mixer(); Mixer m3 = new Mixer(m2); m3.go(); Mixer m4 = m3.m1; m4.go(); Mixer m5 = m2.m1; m5.go(); } void go() { System.out.print("hi "); } } What is the result?
technology programming languages

  1. hi

  2. hi hi

  3. hi hi hi

  4. Compilation fails

  5. hi, followed by an exception

  6. hi hi, followed by an exception

Show answer
Correct Option: F

Given: 1. class Zippy { 2. String[] x; 3. int[] a [] = {{1,2}, {l}}; 4. Object c = new long [4] ; 5. Object[] d = x; 6. } What is the result?

technology programming languages

  1. Compilation succeeds.

  2. Compilation fails due only to an error on line 3.

  3. Compilation fails due only to an error on line 4.

  4. Compilation fails due only to an error on line 5.

  5. Compilation fails due only to an error on line 3 and 5.

  6. Compilation fails due only to an error on line 3,4 and 5.

Show answer
Correct Option: A

Given: class Fizz { int x = 5; public static void main(String[] args) { final Fizz f1 = new Fizz(); Fizz f2 = new Fizz(); Fizz f3 = FizzSwitch(f1,f2); System.out.println((f1 == f3) + " " + (f1.x == f3.x)); } static Fizz FizzSwitch(Fizz x, Fizz y) { final Fizz z = x; z.x = 6; return z; } } What is the result?

technology programming languages

  1. true true

  2. true false

  3. false true

  4. false false

  5. Compilation fails.

  6. An exception is thrown at runtime.

Show answer
Correct Option: A

Given: class Knowing { static final long tooth = 343L; static long doIt(long tooth) { System.out.print(++tooth + " "); return ++tooth; } public static void main(String[] args) { System.out.print(tooth + " "); final long tooth = 340L; new Knowing().doIt(tooth); System.out.println(tooth); } } What is the result?
technology programming languages

  1. 343 340 340

  2. 343 340 342

  3. 343 341 342

  4. 343 341 340

  5. 343 341 343

  6. Compilation fails.

Show answer
Correct Option: D

Given: 1. class Convert { 2. public static void main(String[] args) { 3. Long xL = new Long(456L); 4. long x1 = Long.valueOf("123"); 5. Long x2 = Long.valueOf("123"); 6. long x3 = xL.longValue(); 7. Long x4 = xL.longValue(); 8. Long x5 = Long.parseLong("456"); 9. long x6 = Long.parseLong("123"); 10. } 11. } Which will compile using Java 5, but will NOT compile using Java 1.4? (Choose all that apply.)
technology programming languages

  1. Line 4

  2. Line 5

  3. Line 6

  4. Line 7

  5. Line 8

  6. Line 9

Show answer
Correct Option: A,D,E

Given: 1. class Eco { 2. public static void main(String[] args) { 3. Eco e1 = new Eco(); 4. Eco e2 = new Eco(); 5. Eco e3 = new Eco(); 6. e3.e = e2; 7. e1.e = e3; 8. e2 = null; 9. e3 = null; 10. e2.e = el; 11. e1 = null; 12. } 13. Eco e; 14. } At what point is only a single object eligible for GC?
technology programming languages

  1. After line 8 runs.

  2. After line 9 runs.

  3. After line 10 runs.

  4. After line 11 runs.

  5. Compilation fails.

  6. An exception is thrown at runtime.

Show answer
Correct Option: F

Given: 1. class Bigger { 2. public static void main(String[] args) { 3. // insert code here 4. } 5. } 6. class Better { 7. enum Faster {Higher, Longer}; 8. } Which, inserted independently at line 3, will compile? (Choose all that apply.)

technology programming languages

  1. Faster f = Faster.Higher;

  2. Faster f = Better.Faster.Higher;

  3. Better.Faster f = Better.Faster.Higher;

  4. Bigger.Faster f = Bigger.Faster.Higher;

  5. Better. Faster f2; f2 = Better.Faster.Longer;

  6. Better b; b.Faster = f3; f3 = Better.Faster.Longer;

Show answer
Correct Option: C,E

Given: class Bird { { System.out.print("bl "); } public Bird() { System.out.print("b2 "); } } class Raptor extends Bird { static { System.out.print("r1 "); } public Raptor() { System.out.print("r2 "); } { System.out.print("r3 "); } static { System.out.print("r4 "); } } class Hawk extends Raptor { public static void main(String[] args) { System.out.print("pre "); new Hawk(); System.out.println("hawk "); } } What is the result?
technology programming languages

  1. pre b1 b2 r3 r2 hawk

  2. pre b2 b1 r2 r3 hawk

  3. pre b2 b1 r2 r3 hawk r1 r4

  4. r1 r4 pre b1 b2 r3 r2 hawk

  5. r1 r4 pre b2 b1 r2 r3 hawk

  6. Compilation fails.

Show answer
Correct Option: D

What are the check tables and value tables?

technology programming languages

  1. Check table will be at field level checking.

  2. Value table will be at domain level checking

  3. Value table will be at field level checking

  4. Check table will be at domain level checking

Show answer
Correct Option: A,B

How many types of tables exist in data dictionary?

technology programming languages

  1. Transparent tables

  2. Internal Table

  3. Pool tables

  4. Cluster tables

Show answer
Correct Option: A,C,D

Is Session Method, Asynchronous or Synchronous?

technology programming languages

  1. Asynchronous

  2. Synchronous

  3. Synchronous and Asynchronous

  4. None of above

Show answer
Correct Option: B

Which data type cannot be used to define parameters?
technology programming languages

  1. Type N

  2. Type C

  3. Type F

  4. Type P

Show answer
Correct Option: C

Which Command flushes the database buffers?
technology programming languages

  1. $TAB

  2. $RESET

  3. $INIT

  4. $FREE

Show answer
Correct Option: A

What is new in EJB 2.1 ?
technology programming languages

  1. Message-driven beans (MDBs)

  2. EJB query language (EJB-QL)

  3. Support for Web services

  4. All of the Above

  5. Only 1 & 2

  6. Only 1 & 3

Show answer
Correct Option: D

What is/are true for Entity Beans ?
technology programming languages

  1. Entity beans are permanent business entities

  2. Entity Beans are persistence objects

  3. EntityBeans are permanent

  4. All of the Above

  5. Only 1 & 2

  6. Only 1 & 3

Show answer
Correct Option: D

JMS stands for .....
technology programming languages

  1. Java Messaging Service

  2. Java Message Service

  3. Java Messenger Service

  4. Java Model Security

Show answer
Correct Option: A

Stateful Session Beans can be Persistent ?
technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

It is possible to maintain persistence temporarily in stateful sessionbeans?
technology programming languages

  1. True

  2. False

Show answer
Correct Option: A
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