Pinesucceed Technologies Java Developer Interview Questions, Process, and Tips

Printing the left view of a tree involves printing the leftmost nodes at each level of the tree.

• Traverse the tree using a level order traversal (BFS)

• At each level, print the first node encountered

• Repeat for each level until all nodes are visited

Use binary search to find the target number in a rotated sorted array.

• Use binary search to find the pivot point where the array is rotated.

• Determine which half of the array the target number lies in based on the pivot point.

• Continue binary search in the appropriate half of the array to find the target number.

Association, aggregation, and composition are types of relationships between classes in object-oriented programming.

• Association is a relationship where two classes are related in some way, but not dependent on each other. Example: a student and a teacher.

• Aggregation is a type of association where one class contains a reference to another class, but the referenced class can exist independently. Example: a car has an eng...read more

PUT is used to update or replace an existing resource, while POST is used to create a new resource.

• PUT is idempotent, meaning multiple identical requests will have the same effect as a single request.

• POST is not idempotent, meaning multiple identical requests may have different effects.

• PUT is typically used for updating an existing resource, like updating a user's information.

• POST is typically used for creating a new r

HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to fi...read more

Functional interface is an interface with only one abstract method, used for lambda expressions.

• Functional interfaces can have multiple default or static methods, but only one abstract method.

• They are used for lambda expressions and method references in Java.

• Examples of functional interfaces in Java include Runnable, Callable, and Comparator.