Infosys Interview Questions, Process, and Tips

Exceptions are errors that occur during program execution in Java.

• Exceptions are objects that are thrown when an error occurs.

• They can be caught and handled using try-catch blocks.

• Unchecked exceptions like NullPointerException do not need to be declared in the method signature.

• Checked exceptions like IOException must be declared in the method signature or handled in a try-catch block.

• Custom exceptions can be created by

Explanation of internal working of ArrayList, HashMap, and LinkedList

• ArrayList: dynamic array that can grow and shrink, stores elements in contiguous memory locations

• HashMap: stores key-value pairs, uses hashing to store and retrieve elements

• LinkedList: stores elements in nodes that point to the next node, allows for efficient insertion and deletion