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Q:

What is MultiThreading?

Answer

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

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Subject: Java

Q:

What is MultiTasking?

Answer

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.

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Subject: Java

Q:

How to get contents of the folder?

Answer

File[] listFiles();


this method returns list of files stored in a directory.

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Subject: Java

Q:

How to get last modified date of a file?

Answer

long lastModified();


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

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Subject: Java

Q:

How to check that whether the file object is pointing a folder or not?

Answer

boolean isDirectory();

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Subject: Java

Q:

How to check that the file object is pointing a file on HD?

Answer

boolean isFile();

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Subject: Java

Q:

How to create a file on the hard disk by using File class object?

Answer

We can use the following method call:


boolean createNewFile();


This method creates a new file on the HD. 


 


If a file is already existing with the name given in the constructor then this method does not creates file on HD.


If file is successfully created then this method returns true.


If file is already existing on the HD then this method returns false.


This method may throw IOException whenever IO error is generated while creating file on HD.

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Subject: Java

Q:

Why interface data is public?

Answer

to access non-public data outside class getter methods be defined but we cannot define a  method inside interface we can declared a method inside interface.

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Subject: Java