What does “String[] args” contain in java?

Question

When I run the following program:

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

Answer 1

The main method has a parameter that is an array of String references. So each time you try to print args, it gives you memory location of array 'args' because this String array args located a place in memory for array elements.

That say you have an simple program called 'HelloWorld.java' like this:

public class HelloWorld
{
    public static void main(String [] args)
    {
        for(int i =0; i<args.length; i++)
            System.out.println(""+args[i]);
    }
}

Ready to test this program with command line interface:

java HelloWorld a b c

We can see that this program prints thouse arguments after 'java Helloworld' a b c

Answer 2

It's a string array.

1. Modify your code to this:

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

2. Now compile this code:
   

$>javac Test.java

3. Now run:

$>java Test hello

This will print: "hello"

Because "hello" is the argument you are passing to your class.

If you try: args[x], where x=0..n and run your class via command line: java Test your arguments, then you will see any contents which you pass..