Question

How to create a file using Formatter? What happens if you exit the program without closing it? What will happen if you are trying to write file onto a read only location? What will happen if you write to a file that has been closed? This question is related to Java programming. Please type answers. No screenshot of poorly written handwriting.

Answer 1

>How to create a file using Formatter??

Java Formatter is a utility class that can make life simple when working with formatting stream output in Java. It is built to operate similarly to the C/C++ printf function. It is used to format and output data to a specific destionation, such as a string or a file output stream.

java.util.Formatter class provides support for layout justification and alignment, common formats for numeric, string, and date/time data, and locale- specific output.

So Formatter can not be used for creating a new file.

For creating a file we can use these 5 methods.

1. Using File class.

2. Using I/O streams

3. Using RandomAccessFile

4. Using NIO

5. Create a file and set POSIX Permissions

> What happens if you exit the program without closing it ??

It depends on how you exit. Under controlled cricumstances (via exit ( ) or a return from main( ) ) , the data in the ( output ) buffers will be flushed and the files closed in an orderly manner. Ohter resources that the process had will aslo be released.

If your program crashed out of control, or if it calls one of the alternative exit ( ) or Exit ( ) functions, then the system will still clean up (close) open file descriptors and release other resources, but the buffers won't be flushed, etc.

> What will happen if you are trying to write files onto a read only location?

It will throw a error like AccessDenied so we handle it by try() and chech() methods....

we can't do that because of security purpose.

I hope you got it.....

>  What will happen if you write to a file that has been closed?

After closing a file how can you write it because the resources of read and write was released so they are not more point to the location of the file. the pointer will free the from the memory which was pointing to that file memory.

so now pointer is having some garbage value....so where is write god knows.....

I hope I clear your doubts.....feel free to ask me in comments......and please like my answer..