Files

[Balaji Bang]

in K&B it is given :

Create a Reader or a Writer or a Stream. Specifically, create a FileReader, a
FileWriter, a PrintWriter, a FileInputStream, or a FileOutputStream.
Whenever you create an instance of one of these classes, you automatically
create a file, unless one already exists, for instance

But the following is giving FileNOtFoundException

File x1 = new File("MyText");
FileReader f=new FileReader(x1); 

This is working fine when I used PrintWriter and FileWriter . Not working only for FileReader . Why please explain...........

[Stephen Davies]

File is not a file on your system. new File("MyFile.txt") is creating a new File Object from where you can call various Methods, to create a file on the system, such as .createNewFile(). If your using Sierra & Bates JAVA 5 see page 431, for more details. The example given there is:

import java.io.File;
import java.io.IOException;


public class Writer1 {
	
	public static void main(String[] args) {
		try {
		
		boolean newFile = false;
		File file = new File("fileWrite1.txt"); 	// i'ts only an object
		System.out.println(file.exists());      	// look for real file
		newFile = file.createNewFile();        		// maybe create a file!
		System.out.println(newFile);          		//already there?
		System.out.println(file.exists());			//look again
		
		} catch (IOException e){}
	}

}

Its a simple method for giving feedback on the existence of files, so;

*/ First run */

- false
- true
- true

*/Second run */

- true
- false
- true