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programming languages Online Quiz - 101

Description: programming languages Online Quiz - 101
Number of Questions: 20
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Tags: programming languages
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"WRITE MASTER-REC INVALID KEY GO TO PARA-ERROR. Indicate which of the following are not valid modes of opening the INDEXED file of which MASTER-REC is a record."

technology programming languages

  1. a and b

  2. a and c

  3. c and d

  4. a and d

Show answer
Correct Option: C

"What do you think the output of the following code snippet will be? 01 WS-NUM-TEST PIC +9(2).99. 01 WS-NUM-TEST2 PIC -9(2).99. MOVE 19.99 TO WS-NUM-TEST MOVE -9.99 TO WS-NUM-TEST2 IF WS-NUM-TEST > WS-NUM-TEST2 DISPLAY ""+VE GREATER THAN -VE"" ELSE DISPLAY ""+VE LESS THAN -VE"" END-IF "

technology programming languages

  1. +VE GREATER THAN -VE

  2. +VE LESS THAN -VE

  3. Compile error

  4. Edited Numeric field cannot be used for comparison.

Show answer
Correct Option: C

public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12? (Choose three.)

technology programming languages

  1. final

  2. static

  3. native

  4. public

  5. private

  6. abstract

Show answer
Correct Option: A,B,D
Explanation:

Explanation: In Java, an interface can only have public abstract methods and public static final fields. Therefore, on line 12, we can have only public, static, and final keywords. The correct answer options are D) public.

Option A) final - This option is correct because final keyword can be used only with the variables and methods

Option B) static - This option is correct because static keyword can be used with an interface.

Option C) native - This option is incorrect because native keyword is not allowed.

Option D) public - This option is correct because public keyword can be used

Option E) private - This option is incorrect because private keyword is not allowed

Option F) abstract - This option is incorrect because abstract keyword is not allowed.

Therefore, the correct options are B) static, D) public, and A) final.

Given: 10. public class Bar { 11.static void foo(int...x) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile? (Choose two.)

technology programming languages

  1. foreach(x) System.out.println(z);

  2. for(int z : x) System.out.println(z);

  3. while( x.hasNext()) System.out.println( x.next());

  4. for( int i=0; i< x.length; i++ ) System.out.println(x[i]);

Show answer
Correct Option: B,D

AI Explanation

To determine the two code fragments that will allow the class to compile, let's go through each option:

Option A) foreach(x) System.out.println(z); - This option is incorrect because the "foreach" loop syntax is incorrect. It should be for (int z : x) to iterate through the elements of the x array.

Option B) for(int z : x) System.out.println(z); - This option is correct because it uses the enhanced "for" loop (also known as the "foreach" loop) to iterate through the elements of the x array. This syntax is valid and will allow the class to compile.

Option C) while( x.hasNext()) System.out.println( x.next()); - This option is incorrect because it assumes that x is an iterator object with the methods hasNext() and next(). However, in the given code, x is declared as a variable of type int[] (an array), which does not have these methods. Therefore, this option is incorrect.

Option D) for( int i=0; i&lt; x.length; i++ ) System.out.println(x[i]); - This option is correct because it correctly uses a basic "for" loop to iterate through the elements of the x array. It initializes a counter variable i to 0, checks if i is less than the length of the array x, and increments i in each iteration. The syntax x[i] is used to access the elements of the array. This option is valid and will allow the class to compile.

Therefore, the correct options are B) for(int z : x) System.out.println(z); and D) for( int i=0; i&lt; x.length; i++ ) System.out.println(x[i]);.

Given: 11. public class Test { 12. public static void main(String [] args) { 13. int x =5; 14. boolean b1 = true; 15. boolean b2 = false; 16. 17.if((x==4) && !b2) 18. System.out.print(”l “); 19. System.out.print(”2 “); 20. if ((b2 = true) && b1) 21. System.out.print(”3 “); 22. } 23. } What is the result?

technology programming languages

  1. 2

  2. 3

  3. 1 2

  4. 2 3

  5. 1 2 3

  6. Compilation fails.

Show answer
Correct Option: D

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) 2 - This option is incorrect because the code does not print only "2".

Option B) 3 - This option is incorrect because the code does not print only "3".

Option C) 1 2 - This option is incorrect because the code does not print "1" at any point.

Option D) 2 3 - This option is correct because the code prints "2" and "3" in the output.

Option E) 1 2 3 - This option is incorrect because the code does not print "1" at any point.

Option F) Compilation fails - This option is incorrect because there are no syntax errors in the code provided.

The correct answer is Option D, which is "2 3". This option is correct because the code prints "2" and "3" in the output.

Let's understand the code:

  • Line 13 initializes the variable x with the value 5.
  • Line 14 initializes the boolean variable b1 with true and b2 with false.
  • Line 17 checks if the condition (x==4) &amp;&amp; !b2 is true. Since x is not equal to 4 and !b2 is true (negation of false), the condition is false.
  • Line 20 assigns the value true to b2 and then checks the condition (b2 = true) &amp;&amp; b1. Since b2 is now true and b1 is also true, the condition is true.
  • Line 21 prints "3" in the output.

Therefore, the output of the code will be "2 3".

  1. Given: 31. // some code here 32. try { 33. // some code here 34. } catch (SomeException se) { 35. // some code here 36. } finally { 37. // some code here 38. } Under which three circumstances will the code on line 37 be executed? (Choose three.)
technology programming languages

  1. The instance gets garbage collected.

  2. The code on line 33 throws an exception.

  3. The code on line 35 throws an exception.

  4. The code on line 31 throws an exception.

  5. The code on line 33 executes successfully.

Show answer
Correct Option: B,C,E

AI Explanation

To answer this question, we need to understand the purpose of the finally block in Java and the conditions under which it is executed.

The finally block is used to specify a block of code that will be executed regardless of whether an exception is thrown or not. It is typically used to release resources or perform cleanup operations.

Now let's go through each option to determine when the code on line 37 will be executed:

Option A) The instance gets garbage collected - This option is incorrect. The execution of the finally block is not dependent on garbage collection.

Option B) The code on line 33 throws an exception - This option is correct. If an exception is thrown on line 33, the finally block will still be executed.

Option C) The code on line 35 throws an exception - This option is correct. If an exception is thrown on line 35, the finally block will still be executed.

Option D) The code on line 31 throws an exception - This option is incorrect. The finally block will not be executed if an exception is thrown on line 31.

Option E) The code on line 33 executes successfully - This option is correct. Even if the code on line 33 executes successfully, the finally block will still be executed.

Therefore, the correct answers are options B, C, and E.

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

What will be the output of the below code snippet? public class Quiz1{ public static void main(String args[]) { System.out.print("H" + "a"); System.out.print('H' + 'a'); } }

technology programming languages

  1. HaHa

  2. Ha169

  3. Ha Ha

  4. 169Ha

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) HaHa - This option is incorrect because the code snippet contains two print statements. The first print statement prints "Ha" as a string concatenation of "H" and "a". The second print statement, however, does not produce the same result.

Option B) Ha169 - This option is correct. The first print statement concatenates "H" and "a" as a string, resulting in "Ha". The second print statement performs addition on the ASCII values of the characters 'H' and 'a', which are 72 and 97, respectively. The sum of these ASCII values is 169, which is then printed.

Option C) Ha Ha - This option is incorrect because there is no space character (represented by " ") in the code snippet. The output will not contain a space between "Ha" and "Ha".

Option D) 169Ha - This option is incorrect because the first print statement concatenates "H" and "a" as a string, resulting in "Ha". The second print statement does not concatenate the strings but performs addition on the ASCII values of the characters 'H' and 'a', resulting in 169. Therefore, the output will start with "Ha", not "169".

The correct answer is B. The output of the code snippet will be "Ha169" because the first print statement concatenates "H" and "a" as a string, and the second print statement performs addition on the ASCII values of 'H' and 'a', resulting in 169.

What will be the output of the below code snippet? public class Quiz2 { public static void main(String args[]) { String letters = "ABC"; char[] numbers = { '1', '2', '3' }; System.out.println(letters + " easy as " + numbers); } }

technology programming languages

  1. ABC easy as [C@3e25a5

  2. ABC easy as 123

  3. ABC easy as 1 2 3

  4. ABC easy as 1,2,3

Show answer
Correct Option: A

What will be the output of the below code snippet? public class Quiz3 { public static void main(String args[]) { final String pig = "length: 10"; final String dog = "length: " + pig.length(); System.out.println("Animals are equal: " + pig == dog); } }

technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz4 { public static void main(String args[]) { int j = 0; for (int i = 0; i < 100; i++) j = j++; System.out.println(j); } }
technology programming languages

  1. 99

  2. 0

  3. 100

  4. 101

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz5 { public static void main(String args[]) { int i = 0; while (-1 << i != 0) i++; System.out.println(i); } }

technology programming languages

  1. 32

  2. Infinite Loop

  3. 16

  4. 64

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) 32 - This option is incorrect because the code snippet does not involve any operations that would produce the value 32.

Option B) Infinite Loop - This option is correct. In the given code snippet, the while loop condition is -1 &lt;&lt; i != 0, which shifts the bits of -1 to the left by i positions. As long as the shifted value is not 0, the loop will continue executing. However, since the left shift operation will never result in 0 for any value of i, the loop will continue indefinitely, causing an infinite loop.

Option C) 16 - This option is incorrect because the code snippet does not involve any operations that would produce the value 16.

Option D) 64 - This option is incorrect because the code snippet does not involve any operations that would produce the value 64.

The correct answer is B. The code will result in an infinite loop.

What will be the output of the below code snippet? public class Quiz6 { public static void main(String[] args) { System.out.println(decision()); } static boolean decision() { try { return true; } finally { return false; } } }

technology programming languages

  1. True

  2. False

  3. Compilation Error

  4. Run Time Error

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz7 { public static void main(String[] args) { try { System.out.println("Hello world"); System.exit(0); } finally { System.out.println("Goodbye world"); } } }
technology programming languages

  1. Hello world \n Goodbye world

  2. Hello world

  3. Compilation Error

  4. Run Time Error

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz8 { class Base { public String className = "Base"; } class Derived extends Base { private String className = "Derived"; } public static void main(String[] args) { System.out.println(new Derived().className); } }

technology programming languages

  1. Derived

  2. Compilation Error in Main mehod

  3. Compilation Error due to Derived class

  4. Run Time Error

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz9 { public static void main(String args[]) { int j = 0; for (int i = 0; i < 100; i++) j++; System.out.println(j); } }

technology programming languages

  1. 99

  2. 100

  3. 0

  4. 101

Show answer
Correct Option: B

What will be the output of the below code snippet? public class Quiz10 { public static void main(String args[]) { System.out.println((int) (char) (byte) -1); } }

technology programming languages

  1. 65536

  2. 65535

  3. 1

  4. -1

Show answer
Correct Option: B

Given: 20. public class CreditCard { 21. 22. private String cardlD; 23. private Integer limit; 24. public String ownerName; 25. 26. public void setCardlnformation(String cardlD, 27. String ownerName, 28. Integer limit) { 29. this.cardlD = cardlD; 30. this.ownerName = ownerName; 31. this.limit = limit; 32. } 33. }

technology programming languages

  1. The class is fully encapsulated.

  2. The code demonstrates polymorphism.

  3. The ownerName variable breaks encapsulation

  4. The cardlD and limit variables break polymorphism.

Show answer
Correct Option: C

Which Man class properly represents the relationship “Man has a best friend who is a Dog”?

technology programming languages

  1. class Man extends Dog { }

  2. class Man implements Dog { }

  3. class Man { private BestFriend dog; }

  4. class Man { private Dog bestFriend; }

  5. class Man { private Dog }

  6. class Man { private BestFriend }

Show answer
Correct Option: D

AI Explanation

To properly represent the relationship "Man has a best friend who is a Dog," we need to define a class that includes a private instance variable of type Dog to represent the best friend.

Let's go through each option to understand why it is correct or incorrect:

Option A) class Man extends Dog { } This option is incorrect because it represents a class Man that extends a class Dog, which implies an inheritance relationship rather than a composition relationship.

Option B) class Man implements Dog { } This option is incorrect because it represents a class Man that implements an interface Dog, which is not appropriate for representing a "has-a" relationship.

Option C) class Man { private BestFriend dog; } This option is incorrect because it introduces a new class BestFriend, which is not necessary to represent the relationship. Additionally, the variable should be of type Dog, not BestFriend.

Option D) class Man { private Dog bestFriend; } This option is correct because it represents a class Man that has a private instance variable bestFriend of type Dog, which properly represents the relationship "Man has a best friend who is a Dog."

Option E) class Man { private Dog } This option is incorrect because it includes invalid syntax. It is not possible to use angle brackets in this manner.

Option F) class Man { private BestFriend } This option is incorrect because it includes invalid syntax. It is not possible to use angle brackets in this manner.

The correct answer is D. This option is correct because it represents a class Man that has a private instance variable bestFriend of type Dog, which properly represents the relationship "Man has a best friend who is a Dog."

Which statements about JDBC are true?
technology programming languages

  1. JDBC is an API to connect to relational-, object- and XML data sources

  2. JDBC stands for Java DataBase Connectivity

  3. JDBC is an API to access relational databases, spreadsheets and flat files

  4. JDBC is an API to bridge the object-relational mismatch between OO programs and relational

Show answer
Correct Option: B,C
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