VMware Software Interview Questions and Answers

Check if a Binary Tree formed from a Post order traversal array is a Binary Search Tree.

• Start by constructing the Binary Tree from the given Post order traversal array.

• Check if the Binary Tree satisfies the properties of a Binary Search Tree.

• Use recursion to check if each node's value is within the correct range.

• Example: Post order traversal array [1, 3, 2] forms a Binary Search Tree.

• Example: Post order traversal array...read more

An efficient algorithm in Java to compare two strings.

• Use the equals() method to compare two strings for equality.

• Consider using compareTo() method for comparing strings lexicographically.

• Handle null strings separately to avoid NullPointerException.

• Use equalsIgnoreCase() method for case-insensitive comparison.

It is not possible to create a balanced B tree from an unsorted array in logarithmic complexity.

• Creating a balanced B tree from an unsorted array requires sorting the array first, which has a complexity of O(n log n).

• Balanced B tree construction typically has a complexity of O(n log n) or O(n) depending on the algorithm used.

• Example: If we have an unsorted array [3, 1, 4, 1, 5, 9, 2, 6, 5], we would need to sort it fir...read more

Function to print permutations of elements from arraylists with no duplicates.

• Use recursion to generate all possible permutations by selecting one element from each arraylist at a time.

• Keep track of used elements to avoid duplicates in the permutation sets.

• Use a set data structure to store and check for duplicates efficiently.

To create a binary search tree of minimum height from a sorted skewed binary tree, we can use the following approach:

• Find the middle element of the sorted skewed binary tree.

• Make it the root of the new binary search tree.

• Recursively repeat the process for the left and right halves of the original tree.

• Attach the resulting subtrees as the left and right children of the root.

Delete duplicates from a singly linked list in O(n) time without extra space.

• Use two pointers: current and runner.

• Current traverses the list, while runner checks for duplicates.

• If a duplicate is found, adjust pointers to skip the duplicate.

• Example: For list 1 -> 2 -> 3 -> 2 -> 1, result is 1 -> 2 -> 3.

Pressing the power button initiates the boot process, loading Windows through a series of hardware and software checks.

• Power button pressed: Sends a signal to the motherboard to start the boot process.

• POST (Power-On Self Test): The BIOS/UEFI checks hardware components like RAM, CPU, and storage.

• Bootloader: BIOS/UEFI locates the bootloader on the storage device (e.g., HDD, SSD).

• Windows Boot Manager: The bootloader loads...read more

MVC is a design pattern for structuring applications, while Factory is a creational pattern for object creation.

• MVC stands for Model-View-Controller, which separates application logic into three interconnected components.

• Factory pattern is used to create objects without specifying the exact class of object that will be created.

• In MVC, the Model represents the data, the View displays the data, and the Controller handles...read more

The implemented method would be of the interface that is extended first in the class declaration.

• In this case, since class A implements B and C, the implemented method m1 would be of interface B if B is extended first in the class declaration.

• If C was extended first in the class declaration, then the implemented method m1 would be of interface C.

• The order of interface extension determines which interface's method is im...read more

This function reverses a string in place without using extra memory, modifying the original string directly.

• Use two pointers: one at the start and one at the end of the string.

• Swap characters at these pointers and move them towards the center.

• Continue until the two pointers meet or cross each other.

• Example: For 'hello', the process would be: 'oellh' -> 'olleh'.