Java Command Line How To Take Input

The execution of a Java program is less complex, quite easy, and error-free.

There are many situations that we face during programming where we need to pass the input while executing the program.

Java Command Line How To Take Input

In our previous article, we studied how to take input from the console, in this article, we will learn how a user can pass java command-line arguments during the execution of a program.

The users can pass the arguments during the execution by passing the command-line arguments inside the main() method.

A command-line argument is nothing but the information that we pass after typing the name of the Java program during the program execution.

These arguments get stored as Strings in a String array that is passed to the main() function.

We can use these command-line arguments as input in our Java program.

During the execution of the program, we pass the command as java MyProgram Techvidvan Java Tutorial.

Here the java command is used to run the Java program in which the main function is present and, MyProgram is the name of the java file that we need to run.

JVM considers the input after the program name as command-line arguments.

That is, in our input command, Techvidvan Java Tutorial is considered as command-line arguments in the form of a String array.

These arguments convert into a string array and provided to the main() function as a string array argument.

Therefore, we can never pass numeric arguments through the command line.

If we pass them, they are converted int string and we cant use them as numbers and cant perform any numeric operations with them.

After choosing Run Configurations, you will see following screen.

Then provide the command line argument value in the Program Arguments text box.

There is no limitation on the number of command-line arguments.

We learned that Command line arguments in Java are passed at the execution of the program and the JVM provides them to the args string in the main() method of the Java program.

We came to know how can we pass the String as well as the numeric arguments to the command line as the user input.

You can also run the command line arguments in the IDE such as Eclipse whose step by step process id discussed in this article.

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