Command Line Arguments in Java — Java Technical Interview Questions & Answers

Command Line Arguments in Java

Command Line Arguments in Java

  • Command Line Arguments in Java: state the definition in one sentence. For Command Line Arguments in Java, know the key keywords / API types involved.
  • Be ready with one tiny runnable Command Line Arguments in Java example.
  • Mention one common Command Line Arguments in Java mistake and the fix.
  • Write one tiny example for Command Line Arguments. Compile, print one result, and say the output out loud before you type.
  • Use Command Line Arguments only when the problem needs it. Don’t force it into every program. Know one beginner trap.
  • Let's take this on the board with one tiny Main class — no extra files. Command Line Arguments in Java — output: 20. Scanner reads 12 and 8 from a string — same as typing in CMD, but this Main always runs. Start from main, go line by line, and stop at each print. That output is the proof for Command Line Arguments.

Technical Interview Tip: Explain Command Line Arguments in Java as: definition → why → one code idea.

Code Examples for Command Line Arguments in Java

Example

import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner("12 8");
    int a = sc.nextInt();
    int b = sc.nextInt();
    System.out.println(a + b);
    sc.close();
  }
}

Command Line Arguments in Java — output: 20. Scanner reads 12 and 8 from a string — same as typing in CMD, but this Main always runs.

How to Explain Command Line Arguments in Java to an Interviewer

What is Command Line Arguments?

Command Line Arguments is a Java idea you should explain with one small example. Know the keyword / API used for Command Line Arguments. Type a tiny Main and print one result. For Command Line Arguments, say the output before you code.

Why do we use Command Line Arguments in Java?

Makes the program clearer or safer Command Line Arguments is a Java idea you should explain with one small example.

Write one small example of Command Line Arguments.

Show syntax Say what prints

What mistake do beginners make with Command Line Arguments?

Only the name, no example Command Line Arguments — only memorising the heading. No example, no trap.

Where is Command Line Arguments used in a real program?

Day-to-day Java code