How to check the extension of a Java 7 Path

java path java-7
Thunderforge picture Thunderforge · Dec 11, 2013 · Viewed 52k times · Source

I'd like to check if a Path (introduced in Java 7) ends with a certain extension. I tried the endsWith() method like so:

Path path = Paths.get("foo/bar.java")
if (path.endsWith(".java")){
    //Do stuff
}

However, this doesn't seem to work because path.endsWith(".java") returns false. It seems the endsWith() method only returns true if there is a complete match for everything after the final directory separator (e.g. bar.java), which isn't practical for me.

So how can I check the file extension of a Path?

Answer

fan picture fan · Aug 7, 2014

Java NIO's PathMatcher provides FileSystem.getPathMatcher(String syntaxAndPattern):

PathMatcher matcher = FileSystems.getDefault().getPathMatcher("glob:*.java");

Path filename = ...;
if (matcher.matches(filename)) {
    System.out.println(filename);
}

See the Finding Files tutorial for details.

Related questions

How to check if a path points to an existing file with Java 7's new File API?

The old, more or less deprecated java.io.File API had a method exists which returned true if the File pointed to an existing one in the file system, but I couldn't find any comparable method for java.nio.file.…

Read More
How do I rename (not move) a file in Java 7?

I'm a bit confused with all these new File I/O classes in JDK7. Let's say, I have a Path and want to rename the file it represents. How do I specify the new name, when again a Path is …

Read More
How to access a sub-file/folder in Java 7 java.nio.file.Path?

Java 7 introduced java.nio.file.Path as a possible replacement for java.io.File. With File, when I access a file under a specific, I would do: File parent = new File("c:\\tmp"); File child = new File(parent, "child"); // this …

Read More