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File(File parent, String child);

File(String pathname)

File(String parent, String child)

File(URI uri)

import java.io.File;

public class DirList {
    public static void main(String args[]) {
        String dirname = "/java";
        File f1 = new File(dirname);
        if (f1.isDirectory()) {
            System.out.println("Directory of " + dirname);
            String s[] = f1.list();
            for (int i = 0; i < s.length; i++) {
                File f = new File(dirname + "/" + s[i]);
                if (f.isDirectory()) {
                    System.out.println(s[i] + " is a directory");
                } else {
                    System.out.println(s[i] + " is a file");
                }
            }
        } else {
            System.out.println(dirname + " is not a directory");
        }
    }
}

Directory of /java
bin is a directory
lib is a directory
demo is a directory
test.txt is a file
README is a file
index.html is a file
include is a directory