What is the output of this program ?

class main_arguments {
            public static void main(String [ ] args)
            {
                String [][] argument = new String[2][2];
                int x;
                argument[0] = args;
                x = argument[0].length;
                for (int y = 0; y < x; y++)
                    System.out.print(" " + argument[0][y]);           
            }
        }

To do multi threading in java we use interfaces and classes defined in java.lang package.

Those classes and interfaces are:

Java.lang.Runnable, Java.lang. Thread, Java.lang.ThreadGroup

Executing two or more blocks (threads) of a program at a time is called MultiThreading.

Executing more than one program simultaniously.(i.e at time)

Ex:

Windows media player  is a program

Internet explorer(IE) is another program executing both the programs  at a time is called multi tasking.

A Thread is a block of code that can be executed in parallel with another block of code.

File[] listFiles();

this method returns list of files stored in a directory.

long lastModified();

we can give this return value to a date object and we can get data to be displayed.

boolean isDirectory();

boolean isFile();