CODEWITHSUNDEEP
java
kmort
kmort

Reputation: 2938

Java Path.startswith() broken?

I have to be misunderstanding this. Given the following code, I expect a "they match" printout. I get "oops. no match."

          Path p = Paths.get("C:\\fakename");
          Path q = Paths.get("C:\\fake");
          if(p.startsWith(q))
          {
             System.out.println("they match");   
          }
          else
          {
              System.out.println("oops. no match.");
          }

What am I misunderstanding? The documentation seems pretty clear.

Upvotes: 3

Views: 2297

Answers (6)

Serenaya
Serenaya

Reputation: 21

p and q are from Type "Path". If you want to use startsWith() you need the type "String".

so try this:

package newTestPackage.Contains;

import java.nio.file.Path; import java.nio.file.Paths;

public class testwise {

public static void main(String[] args) {
    Path p = Paths.get("C:\\fakename");
    Path q = Paths.get("C:\\fake");

    if(p.toString().startsWith(q.toString()))
    {
       System.out.println("they match");   
    }
    else
    {
        System.out.println("oops. no match.");
    }
}

}

It`s my first answer here. I hope I was able to help you. :-)

Upvotes: 2

Mena
Mena

Reputation: 48404

Path comparison is not String comparison.

String.startsWith take a single String argument representing any String contained within your target at its beginning.

Path.startsWith(String other)...

Tests if this path starts with a Path, constructed by converting the given path string, in exactly the manner specified by the startsWith(Path) method. On UNIX for example, the path "foo/bar" starts with "foo" and "foo/bar". It does not start with "f" or "fo".

(quoted from API).

Upvotes: 5

christopher
christopher

Reputation: 27356

It won't perform a startsWith on the folder name too. They don't start with the same path, hence the false.

Upvotes: 1

Dave Newton
Dave Newton

Reputation: 160211

But not clear enough, apparently.

Path comparisons check at the path element level, not the string level.

Upvotes: 1

yunandtidus
yunandtidus

Reputation: 4086

According to the documentation you linked : 

 the path "foo/bar" starts with "foo" and "foo/bar". It does not start with "f" or "fo".

Upvotes: 1

fge
fge

Reputation: 121750

What am I misunderstanding?

Well, the documentation states this:

This path starts with the given path if this path's root component starts with the root component of the given path, and this path starts with the same name elements as the given path

And fake isn't the same name element as fakename!

Upvotes: 10

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