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Javaprogramming~15 mins

Syntax for command line arguments in Java - Cheat Sheet & Quick Revision

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beginner
What is the syntax to access command line arguments in a Java program?
Command line arguments are accessed through the String[] args parameter in the main method, like public static void main(String[] args).
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beginner
How do you run a Java program with command line arguments?
Use the command java ClassName arg1 arg2 where arg1, arg2 are the arguments passed to the program.
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beginner
How can you access the first command line argument inside the Java program?
Use args[0] to get the first argument passed from the command line.
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intermediate
What happens if you try to access a command line argument that was not provided?
Accessing an argument index that does not exist causes an ArrayIndexOutOfBoundsException error.
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beginner
Why is the command line argument array declared as String[] args?
Because all command line arguments are passed as strings, even if they represent numbers or other data types.
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What is the correct signature of the main method to receive command line arguments in Java?
Apublic static int main(String[] args)
Bpublic void main(String args)
Cstatic void main(String args[])
Dpublic static void main(String[] args)
How do you run a Java program named MyApp with two arguments: hello and 123?
Ajava MyApp "hello 123"
Bjava MyApp hello 123
Cjava MyApp -hello -123
Djava MyApp args hello 123
What type are command line arguments inside the Java program?
AString
Bint
CObject
Dchar
What happens if you try to access args[2] but only two arguments were passed?
AProgram runs normally
BNullPointerException
CArrayIndexOutOfBoundsException
DCompilation error
Which of these is NOT a valid way to declare the main method to accept command line arguments?
Apublic static void main(String args)
Bpublic static void main(String args[])
Cpublic static void main(String... args)
Dpublic static void main(String[] args)
Explain how command line arguments are passed to and accessed in a Java program.
Describe what happens if you try to access a command line argument index that was not provided.