The ________ block can be used to handle different types of exceptions in a single block.
- catch
- finally
- throw
- try
The try block is used to enclose a section of code that may throw exceptions. You can have multiple catch blocks after a single try block to handle different types of exceptions, making it possible to handle various exceptions in a unified way.
To avoid an infinite loop, the condition within the ________ loop must eventually be false.
- infinite
- inner
- nested
- outer
To prevent an infinite loop in Java, the condition within the outer loop must eventually evaluate to false. An infinite loop occurs when the loop condition is always true, and the loop keeps executing indefinitely. The other options are not directly related to the prevention of infinite loops.
The setLength method, which allows altering the length of the character sequence stored in the object, is a method of ________.
- CharArray
- String
- StringBuffer
- StringBuilder
The setLength method is a method of the StringBuffer class in Java. It allows you to alter the length of the character sequence stored in the StringBuffer object. The other options are not related to the setLength method.
How does Binary Search perform when there are multiple occurrences of the search key in the data?
- It returns an error due to ambiguity.
- It returns the index of the first occurrence.
- It returns the index of the last occurrence.
- It returns the index of the middle occurrence.
Binary Search is designed to find the index of the last occurrence of the search key when there are multiple occurrences. This is because, in binary search, if a match is found, the algorithm continues searching in the right subarray to ensure it returns the last occurrence. This behavior is efficient for tasks like counting occurrences. The other options do not accurately describe the behavior of Binary Search in this context.
If we have a 2D array int[][] arr, the expression arr[i] refers to the __________.
- an error
- entire array
- ith column of the array
- ith row of the array
In a 2D array in Java, arr[i] refers to the ith row of the array. This is because a 2D array is essentially an array of arrays, where each element arr[i] is itself an array representing a row. Accessing arr[i] gives you the entire row at index i.
The expression a != b returns true if a is ______ b.
- equal to
- greater than
- less than
- not equal to
The expression "a != b" returns true if "a" is not equal to "b." It checks if the values of "a" and "b" are different. The "!=" operator is used for inequality comparisons. The other options represent different comparison operations.
Imagine a situation where you are dealing with very large files that need to be read and processed, but you want to ensure that the system remains responsive and does not run out of memory. How would you implement file reading in this case?
- Read the entire file into memory using FileInputStream.
- Use a BufferedReader with a small buffer size.
- Implement a memory-mapped file using FileChannel and MappedByteBuffer.
- Use Scanner with a large buffer size.
To ensure responsiveness and prevent memory exhaustion when dealing with large files, it's best to use a BufferedReader with a reasonably small buffer size. This allows for efficient reading of the file without loading the entire content into memory. The other options are less efficient and may lead to memory issues.
What method is commonly used to execute SQL queries in Java?
- execute()
- executeQuery()
- executeStatement()
- executeUpdate()
In Java, the executeQuery() method is commonly used to execute SQL queries using JDBC. This method is specifically designed for executing SELECT queries and returns a ResultSet containing the query results. The other options (executeStatement(), executeUpdate(), and execute()) are not typically used for executing queries or have different purposes.
You are developing a real-time gaming application where certain operations need to be repeated at regular time intervals. Which looping mechanism and timing control statements would you use to achieve this without blocking the user interface?
- do-while loop and Thread.yield()
- for loop and System.nanoTime()
- forEach loop and System.currentTimeMillis()
- while loop and Thread.sleep()
In a real-time gaming application, you would typically use a while loop in combination with the Thread.sleep() method to introduce a delay between iterations without blocking the UI. The other options may not be suitable for achieving this specific timing control.
How does the FileWriter class handle character encoding?
- It always uses the system's default character encoding.
- It automatically detects and sets the appropriate character encoding.
- It doesn't support character encoding; it writes bytes as is.
- It prompts the user to choose the encoding when creating an instance.
The FileWriter class in Java uses the system's default character encoding for writing text to a file. It doesn't automatically detect or set character encoding. To specify a different encoding, you should use constructors like FileWriter(String fileName, Charset charset) to explicitly set the encoding.
The primary purpose of functions in SASS is to ________.
- Calculate mathematical expressions
- Create loops
- Define variables
- Group CSS properties
The primary purpose of functions in SASS is to calculate mathematical expressions. SASS functions can perform various mathematical operations, making it easy to compute values for CSS properties dynamically. They are valuable for maintaining consistency and making stylesheets more maintainable.
While using a CSS preprocessor, you notice that the compiled CSS has selectors that are excessively long and specific. What might be a potential cause for this in your source files?
- Overuse of nesting in SASS or LESS
- Lack of CSS optimization tools
- Errors in the preprocessor settings
- Incorrect order of imported stylesheets
Excessively long and specific selectors in compiled CSS are often caused by overusing nesting in preprocessors like SASS or LESS. While nesting can improve code organization, it can also lead to overly specific selectors that increase file size and reduce maintainability.