Java/File Input Output/SequenceInputStream

Demonstrate sequenced input.

 
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.util.Enumeration;
import java.util.Vector;
class InputStreamEnumerator implements Enumeration<FileInputStream> {
  private Enumeration<String> files;
  public InputStreamEnumerator(Vector<String> files) {
    this.files = files.elements();
  }
  public boolean hasMoreElements() {
    return files.hasMoreElements();
  }
  public FileInputStream nextElement() {
    try {
      return new FileInputStream(files.nextElement().toString());
    } catch (IOException e) {
      return null;
    }
  }
}
class SequenceInputStreamDemo {
  public static void main(String args[]) throws IOException {
    int c;
    Vector<String> files = new Vector<String>();
    files.addElement("c:\\autoexec.bat");
    files.addElement("c:\\config.sys");
    InputStreamEnumerator e = new InputStreamEnumerator(files);
    InputStream input = new SequenceInputStream(e);
    while ((c = input.read()) != -1) {
      System.out.print((char) c);
    }
    input.close();
  }
}

Sequence IO

 
import java.io.FileInputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
public class SequenceIOApp {
  public static void main(String args[]) throws IOException {
    SequenceInputStream inStream;
    FileInputStream f1 = new FileInputStream("ByteArrayIOApp.java");
    FileInputStream f2 = new FileInputStream("FileIOApp.java");
    inStream = new SequenceInputStream(f1, f2);
    boolean eof = false;
    int byteCount = 0;
    while (!eof) {
      int c = inStream.read();
      if (c == -1)
        eof = true;
      else {
        System.out.print((char) c);
        ++byteCount;
      }
    }
    System.out.println(byteCount + " bytes were read");
    inStream.close();
    f1.close();
    f2.close();
  }
}