I/O K&B Question

[Nabila Mohammad]

This is the self test question of K&B.

I did not under stand the question or the answer what it means.
Tried looking at the API but didn't help either.
Can some one please explalin what's going on?

   
import java.io.*
 
class Directories
{
 
static String[] dirs ={ "dir1","dir"};
 
public static void main(String[] args)
{
 
for (String d: dirs){
 
// insert code here
 

File file = new File(path,args[0]);
 

// insert code here
}
}
}import java.io.*
 
class Directories
{
 
static String[] dirs ={ "dir1","dir"};
 
public static void main(String[] args)
{
 
for (String d: dirs){
 
// insert code here
 

File file = new File(path,args[0]);
 

// insert code here
}
}
}

And the invocation is
java Directores file2.txt

is issued from a directory that has two subdirectories "dir1" and "dir2" and that "dir1" has a file "file1.txt" and "dir2" has a file "file2.txt",
and the out put is :
false true

Which set of code fragments must be inserted?


1. String path=d;
System.out.println(file.exists() + " ");

2. String path=d;
System.out.println(file.isFile() + " ");

3. String path=File.separator + d;
System.out.println(file.exists() + " ");

4. String path=File.separator + d;
System.out.println(file.isFile() + " ");

[sharad sinha]

    
  ....
  dirs ={ "dir1","dir2"};
  ....
  for (String d: dirs){ 
    String path=d;  
    File file = new File(path,args[0]); 
    System.out.println(file.exists() + " "); // prints false true
  }
  ....    
  for (String d: dirs){ 
    String path=d; 
    File file = new File(path,args[0]); 
    System.out.println(file.isFile() + " "); // prints false true
  }
   ------------------------------------- 
   And the invocation is java Directores file2.txt

options 1 and 2 are correct. what is the problem?
You are already inside the directory from where the command is invoked.
In the first for loop file2.txt will not be found in dir1 and will be found in dir2.
In the second for loop file2.txt is not a file inside dir1 but is a file inside dir2.