File Input Output Java

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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
public class FileInputOutputExample {
  public static void main(String[] args) throws Exception {
    InputStream is = new FileInputStream("in.txt");
    OutputStream os = new FileOutputStream("out.txt");
    int c;
    while ((c = is.read()) != -1) {
      System.out.print((char) c);
      os.write(c);
    }
    is.close();
    os.close();
  }
}