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Java Programming Language Quiz - 4

Description: Java Programming Language Quiz - 4
Number of Questions: 9
Created by:
Tags: java
Attempted 0/9 Correct 0 Score 0

What is the output of following piece of code ?

int x = 2;
 switch (x) {
 case 1:System.out.println("1?);
 case 2:
 case 3:System.out.println("3?);
 case 4:
 case 5:System.out.println("5?);
 }
  1. No output

  2. 3 and 5

  3. 1, 3 and 5

  4. 3


Correct Option: B,D
Explanation:

To solve this question, the user needs to understand the concept of switch case statements in Java. The switch statement tests the value of a variable and compares it with multiple cases. If a case matches the value of the variable, then the code inside that case is executed. If no matching cases are found, then the default case is executed.

In the given code, the variable x is initialized to 2. The switch statement checks the value of x, and since it matches the case 2, the code inside that case is executed. Since there are no break statements, the control falls through to the next case, which is 3. Thus, the output will be "3?".

The case for 1 and 5 are not executed because the value of x is not equal to 1 or 5.

Option A is incorrect because there is output from the code. Option B is incorrect because the output is not just 3 and 5. Option C is incorrect because there is no output for 1.

Therefore, the answer is:

The Answer is: D. 3

  1. the new method should return int

  2. the new method can return any type of values

  3. the argument list of new method should exactly match that of overriden method

  4. the return type of new method should exactly match that of overriden method


Correct Option: C

A Vector is declared as follows. What happens if the code tried to add 6 th element to this Vector new vector(5,10)

  1. The element will be successfully added

  2. ArrayIndexOutOfBounds Exception

  3. The Vector allocates space to accommodate up to 15 elements

  4. none of these


Correct Option: A,C
  1. Thread

  2. Runnable

  3. Both of these

  4. none of these


Correct Option: B
  1. It must be marked final

  2. It can be marked abstract

  3. It can be marked public

  4. It can be marked static


Correct Option: B

Which is true about an anonymous inner class?

  1. It can extend exactly one class and implement exactly one interface

  2. It can extend exactly one class and can implement multiple interfaces

  3. It can extend exactly one class or implement exactly one interface

  4. It can implement multiple interfaces regardless of whether it also extends a class

  5. It can implement multiple interfaces if it does not extend a class


Correct Option: C
  1. The java command can access classes from more than one package, from a single JAR file.

  2. JAR files can be used with the java command but not with the javac command.

  3. In order for JAR files to be used by java, they MUST be placed in the /jre/lib/ext sub-directory within the J2SE directory tree.

  4. When a part of a directory tree that includes subdirectories with files is put into a JAR file, all of the files are saved in the JAR file, but the subdirectory structure is lost.


Correct Option: A
  1. X extends Y is correct if and only if X is a class and Y is an interface

  2. X extends Y is correct if and only if X is an interface and Y is a class

  3. X extends Y is correct if X and Y are either both classes or both interfaces

  4. X extends Y is correct for all combinations of X and Y being classes and/or interfaces.


Correct Option: C
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