Correct Answer: To create directory on the HD we use mkDir() method: boolean mkDir(); This method returns true if the directory is created on HD This method returns false if the directory is already existing on HD

Correct Answer: boolean isFile();

Correct Answer: boolean isDirectory();

Correct Answer: long lastModified(); we can give this return value to a date object and we can get data to be displayed

Correct Answer: File[] listFiles(); this method returns list of files stored in a directory

Correct Answer: A Thread is a block of code that can be executed in parallel with another block of code

Correct Answer: Executing more than one program simultaniously(ie 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

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

Correct Answer: To do multi threading in java we use interfaces and classes defined in javalang package Those classes and interfaces are: JavalangRunnable, Javalang Thread, JavalangThreadGroup

Correct Answer: When ever two or more threads are sharing same data for updating then unpredicted result will be there in the data For Example take a thread is depositing amount in Account Object and another thread is withdrawing amount from the same Account Object when ever both threads are executed simultaneously then unexpected result is stored in the balance of the Account Object