How does the isAbsolute method run[Java]?

Question

The isAbsolute method does not have a body in the path interface, but I can run it in the following code. How is this possible?

Path path= Paths.get("D:\\Example\\1.txt");
    System.out.println(path.isAbsolute());//prints true

Because Paths.get returns an object that implements the Path-interface. — marstran
– marstran, Commented Jul 12, 2021 at 13:47
Are you interested in the implementation of the mechanism, or the concepts? For the implementation, see: stackoverflow.com/questions/1543191/method-overriding-in-java — Hulk
– Hulk, Commented Jul 12, 2021 at 13:57
For the concepts, see stackoverflow.com/questions/12374399/… and the questions linked from there. — Hulk
– Hulk, Commented Jul 12, 2021 at 13:59

Kryštof Vosyka · Accepted Answer · 2021-07-12 18:15:22Z

0

Imagine following code:

public interface Foo {
  public boolean bar();
}

public class Fooz implements Foo {
  @Override
  public boolean bar() {
    return false;
  }
}

And:

public Foo getFoo() {
  return new Fooz();
}

public static void main(String[] args) {
  Foo myFoo = getFoo();
  System.out.println(myFoo.bar()) //false
}

If you are looking for actual implementation of this function, I advise looking thru the source code of JVM of your choosing. Example of one such implementation can be found in UnixPath.java on OpenJDK github repo.

edited Jul 12, 2021 at 18:15

answered Jul 12, 2021 at 13:59

Kryštof Vosyka

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3 Comments

mramz Over a year ago

I understand what you mean, but the problem is that if you follow this method, the method will not work. Paths.get () Returns the Path.of () method. The of() method is also returns FileSystems.getDefault ( ) .getPath (first, more). getDefault () itself Returns a FileSystem object that calls the getPath () method. This method returns a Path object, but it is not yet clear how the isAbsolute method is implemented.

Henry Twist Over a year ago

What do you mean the method will not work? Your question seems to indicate that you wanted to know how it was even possible to call isAbsolute, but are you actually looking for the source code of the implementation of isAbsolute?

mramz Over a year ago

Yes, that's what I mean. I want to know how this is implemented.[looking for source code]

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