IO Doubt

[Abhi vijay]

  import java.io.*;

public class Directories2
{
public static void main(String[] args) throws IOException
{
	File dir = new File("dir2");
	dir.mkdir();
File file = new File(dir,"file1.txt");
file.createNewFile();
System.out.println(file.exists());
System.out.println(file.isFile());
File file1= new File("file2.txt");

System.out.println(file1.isFile());    // Line2
}
}  

Whys is line2 returning false. In this case file2 has not even been created.

[Punit Singh]

Abhi vijay wrote:

Whys is line2 returning false. In this case file2 has not even been created.

As there is no such file (file2.txt) in the file system.

Now replace those last two lines with these line.

 File file1= new File(dir,"file1.txt");

System.out.println(file1.isFile());    

What did you get?

[Ruben Soto]

You answered your own question. According to the API, isFile() returns true if and only if the file denoted by this abstract pathname exists and is a normal file. Since in this case the file does not exist, it returns false.

[Abhi vijay]

But a file is created when file.createNewFile() is invoked
.

  File file2= new File(dir,"file2.txt");

System.out.println("FILE2   "+file2.isFile());
System.out.println("FILE2   "+file2.exists()); // Line2  

Here file2.createNewFile(); is never invoked. Then how is file2 created???

[Punit Singh]

Abhi vijay wrote:But a file is created when file.createNewFile() is invoked
.

  File file2= new File(dir,"file2.txt");

System.out.println("FILE2   "+file2.isFile());
System.out.println("FILE2   "+file2.exists()); // Line2  

Here file2.createNewFile(); is never invoked. Then how is file2 created???

Where is the output? Ya file2.txt will not be created, but it could be existing already also na.

[Abhi vijay]

....oops... Thanks Punit.
I thought that isFile() only checks whether it is a file/not. But it turned out that it also checks whether that particular file is present in the system/current directory.