Demonstrate sequenced input. : SequenceInputStream « File Input Output « Java

1. Java
2. File Input Output
3. 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();
  }
}

 

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