Varian Medical Systems Interview Questions and Answers

Java provides various classes for file handling, allowing reading and writing operations using streams.

• Use FileWriter for writing text files: FileWriter writer = new FileWriter('file.txt');

• Use BufferedWriter for efficient writing: BufferedWriter bufferedWriter = new BufferedWriter(writer);

• Always close the writer using bufferedWriter.close() to free resources.

• Handle exceptions using try-catch blocks to manage IOExceptio...read more

Creating a collection from a string involves splitting the string into elements and storing them in a data structure.

• Use the split() method to divide the string into an array. Example: 'a,b,c'.split(',') results in ['a', 'b', 'c'].

• Choose a collection type based on requirements: Array, List, Set, etc.

• For unique elements, consider using a Set. Example: new Set('aabb') results in ['a', 'b'].

• If order matters, use an Array ...read more

In Java, a top-level class cannot be declared private; only nested classes can be private.

• Top-level classes can be public, protected, or package-private, but not private.

• Private classes can only be nested within another class.

• Example of a private nested class: class Outer { private class Inner {} }

• Private classes are used to encapsulate functionality within a specific context.

Yes, a private constructor in Java restricts instantiation and is often used in singleton patterns or utility classes.

• Singleton Pattern: A class can have a private constructor to ensure that only one instance of the class is created. Example: public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } re...read more

In Playwright, the alternative for @Test annotation is using the test function from the Playwright Test framework.

• Playwright uses the 'test' function to define test cases, similar to @Test in other frameworks.

• Example: 'test('should load the homepage', async () => { ... });'

• You can group tests using 'describe' blocks: 'describe('Homepage tests', () => { ... });'

• Playwright supports various assertions through the 'e...read more

Assertions in Playwright validate expected outcomes in automated tests, ensuring application behavior meets requirements.

• Use 'expect' from Playwright's test library to create assertions.

• Example: expect(page.title()).toBe('Expected Title');

• Assertions can check various conditions like visibility, text content, and element states.

• Example: expect(await page.isVisible('selector')).toBe(true);

• Assertions can be chained for mo...read more

Read command line arguments in Python to execute functions based on user input.

• Use the 'sys' module to access command line arguments: `import sys`.

• Access arguments via `sys.argv`, which is a list of command line inputs.

• Example: `sys.argv[0]` is the script name, `sys.argv[1]` is the first argument.

• Define functions and use conditional statements to execute based on input.

• Example: `if sys.argv[1] == 'test': run_test_funct...read more

Creating persistent automation involves ensuring scripts run after system restarts using services or scheduled tasks.

• Use a service manager (e.g., systemd on Linux) to run automation scripts on startup.

• Create a scheduled task in Windows Task Scheduler to trigger automation scripts after reboot.

• Implement a watchdog mechanism to restart automation if it fails unexpectedly.

• Store automation state in a database or file to re...read more

Implementing an LRU cache to efficiently manage data retrieval and storage based on usage frequency.

• Use a hash map for O(1) access to cache items.

• Use a doubly linked list to maintain the order of usage.

• When adding an item, place it at the front of the list.

• When accessing an item, move it to the front of the list.

• If the cache exceeds its capacity, remove the least recently used item from the end of the list.

• Example: For...read more

Explore various ORM options in Java beyond Spring Data JPA for effective database management.

• Hibernate: A popular ORM framework that provides a powerful, flexible API for database interactions. Example: Using SessionFactory to manage sessions.

• JPA (Java Persistence API): A specification for ORM in Java. Can be used with various implementations like Hibernate or EclipseLink. Example: Using EntityManager for CRUD operatio...read more