Java Programming: Working with Command Line Arguments
Command-line arguments are a simple yet powerful feature in Java that allows you to pass information to a program at runtime without the need for interactive input or changing the source code.
To use command-line arguments in a Java program, you define the method as . The Java Virtual Machine (JVM) receives these values when you run the program and stores them as strings in the array.
Here's how it works: When you execute the program from the command line, for example, , the JVM passes as and as . Inside the method, holds these values as strings, regardless of whether they look like numbers or words.
You can then access and use these arguments within the program. For instance, a simple program that prints all command-line arguments it receives looks like this:
To compile this program, save it as and use the command in the terminal. Run it with the command to see the output:
This feature offers flexibility without the need for recompilation or manual user prompts. The number of arguments can be checked using .
In summary, to use command-line arguments in Java:
- Define and access the passed arguments via .
- The JVM puts the command-line inputs as strings into the array when launching the program.
- This enables flexible input without recompilation or manual user prompts.
- JVM wraps them into the array, where each value is stored as a string (e.g., , , etc.).
- To compile a Java program, save it as a file and use the command followed by the file name (e.g., ).
- The arguments passed to the program will be displayed as the output when the program is run.
- The program name can be replaced with any valid file name when running the command.
- The output will be displayed in the command prompt window.
- The example given is for a program named .
- For efficient data organization and retrieval, developers often use a data structure called a trie to traverse command-line arguments in Java programs.
- Advancements in technology, like the integration of trie data structures in Java, expand the possibilities of creating interactive command-line applications with ease and efficiency.
