edu.pdx.cs.joy.java8.FindJavaFilesUsingJava8 Maven / Gradle / Ivy
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package edu.pdx.cs.joy.java8;
import java.io.File;
import java.util.Arrays;
/**
* This program demonstrates how Lambdas in Java 8 greatly simplify using
* "functional interfaces" like FileFilter and
* FileNameFilter.
*
* @since Summer 2014
*/
public class FindJavaFilesUsingJava8 {
/**
* Prints out the names all of the Java source files in a directory
* and then recurses over subdirectories.
*/
private static void findJavaFiles(File directory) {
File[] javaFiles = directory.listFiles((dir, name) -> name.endsWith(".java"));
Arrays.asList(javaFiles).forEach(System.out::println);
File[] subdirectories = directory.listFiles(File::isDirectory);
Arrays.asList(subdirectories).forEach(FindJavaFilesUsingJava8::findJavaFiles);
}
/**
* The one command line parameter is the directory in which to start
* the search.
*/
public static void main(String[] args) {
File file = new File(args[0]);
if (file.isDirectory()) {
// Look for Java files
findJavaFiles(file);
} else {
System.err.println(file + " is not a directory");
}
}
}