Dec 2, 2021by @kodeazy

Java what is command line arguments? how to resolve java.lang.ArrayIndexOutOfBoundsException Index 0 out of bounds for length 0

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java

Command Line Arguments are the arguments that are passed during the run time of java program.
These arguments helps to specify configuration information while launching our application.

Below is the sample example of Command Line Arguments.

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

After compiling and running the program with below commands
```
javac CommandLine.java
java CommandLine
```
Output:
Here we did not specify any argument while running the code and we are trying to access args[0] so we got the above error.
we have to specify command line arguments while running the program as below.
```
java CommandLine firstCommandLineArgument 
```
Output:
```
firstCommandLineArgument
```
we can specify n number of command line arguments.