Coforge Software Developer Interview Questions, Process, and Tips

Arraylist, linkedlist, map, and hashtable are data structures used in programming.

• Arraylist is a resizable array that can store any type of data.

• Linkedlist is a collection of nodes that contain data and a reference to the next node.

• Map is a collection of key-value pairs where each key is unique.

• Hashtable is similar to a map but is synchronized and does not allow null keys or values.

wait is used for synchronization between threads while sleep is used to pause the execution of a thread

• wait is used to wait for a specific condition to occur while sleep is used to pause the execution for a specific amount of time

• wait releases the lock on the object while sleep does not

• wait is called on an object while sleep is called on a thread

• wait can be interrupted by another thread while sleep cannot

start() method starts a new thread and calls the run() method, while run() method executes the code in the current thread.

• start() method creates a new thread and executes the code in the run() method of that thread.

• run() method executes the code in the current thread.

• Calling run() method directly does not create a new thread.

• start() method can be called only once, while run() method can be called multiple times.

A prime number is a number that is only divisible by 1 and itself.

• Start by checking if the number is less than 2, as prime numbers start from 2.

• Use a loop to check if the number is divisible by any number from 2 to the square root of the number.

• If the number is divisible by any of these numbers, it is not prime.

• If the number is not divisible by any of these numbers, it is prime.

To change the name of the third person in a table with 4-5 names.

• Access the table

• Identify the third person's name

• Replace the name with the new name

Sum of numbers in a string with alphabets.

• Iterate through the string and check if each character is a number.

• If it is a number, add it to a running total.

• Return the total sum of all numbers in the string.

Abstract classes are classes that cannot be instantiated and can have both abstract and non-abstract methods. Interfaces are contracts that define the methods that a class must implement.

• Abstract classes can have constructors while interfaces cannot

• A class can implement multiple interfaces but can only inherit from one abstract class

• Abstract classes can have instance variables while interfaces cannot

• Interfaces can have...read more