Exercises: Java Command Line Arguments

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In this lesson, you will learn.

• Exercises

Exercise 1: Reverse and Print Arguments

Problem Statement:

• Write a Java program that takes an arbitrary number of command-line arguments and prints them in reverse order.
• If no arguments are provided, the program should print a message indicating that no arguments were passed.

Learning Objective:

• Understand how to access and manipulate elements of the args array.

Sample Execution:

Input: java ReverseArguments One Two Three

Output:

Three Two One

Exercise 2: Calculate Average of Numbers

Problem Statement:

• Create a Java program that accepts a series of integers as command-line arguments and calculates their average.
• The program should handle any incorrect input (non-integer values) gracefully by displaying an appropriate error message.
• If no integers are provided, it should inform the user.

Learning Objective:

• Practice type conversion.

Sample Execution:

• Input: java AverageNumbers 4 8 15 16 23 42
• Output: Average: 18.0

Exercise 3: Check for Palindrome

Problem Statement:

• Develop a Java program that takes a single string as a command-line argument and checks whether the string is a palindrome (a string that reads the same backward as forward).
• The program should print a message indicating whether the input string is a palindrome or not.
• If no argument or more than one argument is provided, the program should display a usage message.

Learning Objective:

• Utilize string manipulation techniques and understand command-line argument validation.

Sample Execution:

• Input: java PalindromeChecker racecar
• Output: racecar is a palindrome.

End of the lesson….enjoy learning

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