Exception Handling: Number Format Error

In this problem, you will implement a static method parseNumber(String input) that converts a string to an integer. It should return the integer value when conversion is possible, and throw NumberFormatException when the string cannot be converted.

Learning Objective: Understand the conditions under which Integer.parseInt() throws NumberFormatException and how exceptions propagate

Specifications

Implement a static method with the following signature:

public static int parseNumber(String input)

• If input can be interpreted as an integer, return its int value
• If input cannot be interpreted as an integer, throw NumberFormatException (achieved naturally by delegating to Integer.parseInt())

Convertible Examples

• "123" → 123
• "-456" → -456
• "0" → 0

Non-convertible Examples (NumberFormatException)

• "abc" → exception
• "12.5" → exception (strings with decimal points are not allowed)
• "" → exception (empty string is not allowed)