UBS ENO Interview Questions and Answers

Target API level is the version of Android that an app is designed to run on. Android Studio is used to build Android apps. APK is the file format for Android apps.

• Target API level determines the minimum version of Android that an app can run on

• Android Studio is the official IDE for building Android apps

• APK stands for Android Package Kit and is the file format for Android apps

Polymorphism in Java refers to the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables methods to be overridden in a subclass with the same name but different implementation.

• Polymorphism is achieved through method overriding and method overloading.

• Example: A superclass Animal with a method 'makeSound()', and subclass...read more

Yes, risk and controls are correlated.

• Risk management involves identifying, assessing, and mitigating risks, while controls are measures put in place to manage those risks.

• Effective controls can reduce the likelihood and impact of risks, while inadequate controls can increase risk.

• For example, implementing cybersecurity controls can reduce the risk of a data breach.

• However, over-reliance on controls can also creat...read more

Indices in relational databases are used to improve query performance by allowing faster data retrieval.

• Clustered index: Determines the physical order of data in a table.

• Non-clustered index: Creates a separate structure that contains a copy of the indexed columns and a pointer to the actual data.

• Unique index: Ensures that the indexed columns contain unique values.

• Composite index: Combines multiple columns into a s...read more

Multithreading in Java allows multiple threads to execute concurrently, improving performance and responsiveness.

• Multithreading allows multiple tasks to run concurrently within a single program.

• Each thread has its own stack and runs independently, sharing resources like memory.

• Java provides built-in support for multithreading through the Thread class and Runnable interface.

• Example: Creating a new thread using Thre...read more

Given a string of consecutive nonnegative integers with one missing number, find the missing integer.

• Iterate through all possible substrings and check if they form a valid sequence of consecutive integers.

• If a valid sequence is found, return the missing number.

• Handle cases where there are multiple missing numbers, all numbers are present, or the string is invalid.

• Consider the constraints provided to optimize the s...read more