Granny's Programming Pearls
"inside of every large program is a small program struggling to get out"
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File constructor  RSS feed

 
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File directory = new File(�d�);
File file = new File(directory,�f�);
Can you explain this statements.
Thanks.
 
Sheriff
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42
Android Google Web Toolkit Hibernate IntelliJ IDE Java Spring
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Lets take an example. Suppose your program is in the directory

/home/siddharth/java

then

File directory = new File("d");

here directory will point to the path

/home/siddharth/java/d

this d can be a file or directory. Now the second statement

File file = new File(directory,"f");

Now this object named file will point to the path

/home/siddharth/java/d/f

so basically if you provide two parameters to the file constructor, then the first parameter points to the directory inside which the second parameter will point to...
 
siddharth das
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if I write the following statement
File file = new File(directory,"h.txt");
instead of
File file = new File(directory,"f");

then what will happen?
 
Ankit Garg
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then file = new File(directory,"h.txt"); will point to h.txt inside the directory pointed by directory object...
 
siddharth das
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But I do not find any text file is created.
 
Ranch Hand
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Hey Dear,

You need to add following statement also as such new File will not create physical file for you.

file.createNewFile() if this is true then your file is created else not.
 
siddharth das
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public static void main(String[] args) {
File p = new File("a");
File f = new File(p,"h.txt");
System.out.println(f.getAbsolutePath());

try

{
f.createNewFile();
}
catch(Exception e){System.out.println("test");}



}

In this case,there is no text file is created.But exception is thrown.
Output is test
 
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Does your directory "a" exist before the creation of the file?
 
Greenhorn
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You need to create dir.

File p = new File("a");
p.mkdir();
File f = new File(p,"h.txt");
System.out.println(f.getAbsolutePath());

try

{
f.createNewFile();
}
catch(Exception e){System.out.println("test");}



}
 
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