import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;

public class Ahah {

	
	public static void main(String[] args) throws IOException {
		File srcFile = new File("d:\\srcDir");
		File desfFile = new File("d:\\desDir");
		String[] fileArr = srcFile.list(new FilenameFilter() {
			
			@Override
			public boolean accept(File dir, String name) {
				return new File(dir, name).isFile() && name.endsWith(".java");
			}
		}); 
		
		for (String str : fileArr) {
			BufferedReader br = new BufferedReader(new FileReader(new File(srcFile, str)));
			BufferedWriter bw = new BufferedWriter(new FileWriter(new File(desfFile, str.replace(".java", ".jad"))));
			String line = null;
			while ((br.readLine()) != null) {
				bw.write(line);
				bw.newLine();
				bw.flush();
			}
			br.close();
			bw.close();
		}
	}
	
}