Finding Duplicate Files

[Nim]

Is there an easier way to find duplicate files?

import java.io.*;
public class Test {
	public static void main(String[] args) throws Throwable {
		System.out.print(duplicate(new File("C:\\Users\\Me\\Desktop\\4-01 Living the Dream.avi"),
			new File("C:\\Users\\Me\\Desktop\\4-01 Living the Dream - Copy.avi")));
	}
	public static boolean duplicate(File f1, File f2) throws Throwable {
		FileInputStream fis1 = new FileInputStream(f1),
			fis2 = new FileInputStream(f2);
		byte[] ba1 = new byte[fis1.available()],
			ba2 = new byte[fis2.available()];
		
		if (ba1.length == ba2.length) {
			fis1.read(ba1);
			fis2.read(ba2);
			for (int i = 0; i < ba1.length; i++) {
				if (ba1[i] != ba2[i]) return false;
			}
			return true;
		}
		return false;
		
	}
}

Is this seriously the quickest way? I notice some redundancy when you read the FileInputStream into the byte array, and then check each byte. Is there a way to read the file byte-by-byte and check it on-the-fly? It would replace the byte array, to just one byte variable.