Syntax for command line arguments in Java - Practice Problems & Coding Challenges

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Challenge - 5 Problems

💻 code output

intermediate

What is the output of this Java program with command line arguments?

Consider the following Java program. What will it print if run with arguments apple banana?

Java

public class Main {
    public static void main(String[] args) {
        System.out.println(args[0] + " and " + args[1]);
    }
}

A apple and banana

B args[0] and args[1]

C applebanana

D ArrayIndexOutOfBoundsException

💻 code output

intermediate

What happens if no command line arguments are passed?

What will this Java program print if run without any command line arguments?

Java

public class Main {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.out.println("No arguments");
        } else {
            System.out.println(args[0]);
        }
    }
}

A No arguments

B null

C ArrayIndexOutOfBoundsException

D args[0]

💻 code output

advanced

What is the output when printing all command line arguments?

What will this Java program print if run with arguments one two three?

Java

public class Main {
    public static void main(String[] args) {
        for (String arg : args) {
            System.out.print(arg + "-");
        }
    }
}

A -eerht-owt-eno

B one-two-three-

C one two three

D one-two-three

💻 code output

advanced

What error occurs when accessing args without checking length?

What error will this Java program throw if run without any command line arguments?

Java

public class Main {
    public static void main(String[] args) {
        System.out.println(args[0]);
    }
}

A Compilation error

B NullPointerException

C No output, program ends silently

D ArrayIndexOutOfBoundsException

🧠 conceptual

expert

How to correctly parse integer command line arguments in Java?

You want to read two integer numbers from command line arguments and add them. Which code snippet correctly does this?

A int a = Integer.valueOf(args[0]); int b = Integer.valueOf(args[1]); System.out.println(a + b);

B int a = (int) args[0]; int b = (int) args[1]; System.out.println(a + b);

C int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[1]); System.out.println(a + b);

D int a = args[0]; int b = args[1]; System.out.println(a + b);