Java - Passing arguments to the Main method

Question

I'm just a beginner to write programs in Java. How to pass the arguments (Array of strings) to the main method? I'm using Eclipse as an IDE

public static void main(String[] args) {
    // TODO Auto-generated method stub
    if (args[0].equals("-h"))
        System.out.print("Hello,");
    else if (args[0].equals("-g"))
        System.out.print("Goodbye,");

    // print the other command-line arguments
    for (int i = 1; i < args.length; i++)
        System.out.print(" " + args[i]);

    System.out.println("!");
}

You shouldn't access args[0] unless you know for sure you have at least one element in the args array. — Michael Markidis, Jun 22 '16 at 07:17
m a beginner too and just curious why is args getting checked if its equals to "-h" ? — hafiz ali, Jan 03 '20 at 10:35

score 4 · Accepted Answer · answered Jun 22 '16 at 07:30

Run > Run Configurations > Java Application > Arguments > Program arguments

Also, make sure your code works when no arguments are passed, don't just directly pick values from array.

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        if (args != null && args.length > 0) {
            if (args[0].equals("-h"))
                System.out.print("Hello,");
            else if (args[0].equals("-g"))
                System.out.print("Goodbye,");

            // print the other command-line arguments
            for (int i = 1; i < args.length; i++)
                System.out.print(" " + args[i]);

        } else{
            System.out.print("No Arguments passed");
        }
        System.out.println("!");
    }

score 1 · Answer 2 · answered Jun 22 '16 at 07:13

1

You can pass arguments in Run Configurations -> Java Application -> Arguments -> Program arguments

Link :- http://www.cs.colostate.edu/helpdocs/eclipseCommLineArgs.html

answered Jun 22 '16 at 07:13

Jaiprakash

599
2
7

2

That website looks like it hasn't been updated since 1998. – Michael Markidis Jun 22 '16 at 07:14
It still provides the basic overview which is used to pass the arguments. You can also refer to http://stackoverflow.com/questions/19646719/eclipse-command-line-arguments/19648592 – Jaiprakash Jun 22 '16 at 07:16

score 0 · Answer 3 · edited Jun 22 '16 at 10:42

0

right click | run as | open Run Dialog |（x）=Arguments

then put you args

edited Jun 22 '16 at 10:42

xenteros

15,586
12
56
91

answered Jun 22 '16 at 07:15

biubiu

1
1

Java - Passing arguments to the Main method

3 Answers3