You are writing a method that returns an ArrayList named al.
You need to ensure that changes to the ArrayList are performed in a thread-safe manner.
Which code segment should you use?

You define the following regular expression of currency values:
regex tx = new regex(“^-?d+(.d{2})?$”)
You are required to write code that will be used to find whether a string in the variable named Bill matches the regular expression or not. You are also required to use this code as the expression in a conditional statement and need to know which code segment to use.
What should you do?

Domain.com has a file server named Certkiller -SR07 that stores old inventory files. Domain.com has given you the task of creating an application to archive these old inventory files.
The inventory files have to be compressed prior to being uploaded to Domain.com’s Web server.
You are currently writing a method that will receive a byte array and compress it into a new file.
You need to ensure that a data corruption check takes place during the decompression process.
What should you do?

Domain.com has asked you to create a file management application to monitor the hosts file.
Domain.com has instructed you to change the hosts file if it has been changed.
You, therefore, need to display the size and whether the hosts file is set to read-only.
What should you do?

Domain.com has asked you to develop an application that displays the properties for all Domain.com’s network drives.
The information generated by this application will be utilized by Domain.com’s network administrators to verify client setups.
You need to ensure that these requirements are fully satisfied.
What should you do?