import java.util.Enumeration;

public class Example8 {
  private Enumeration e;
  public Example8 () {
    e = System.getProperties().propertyNames();
  }
  public String getProperty () {
    if (e.hasMoreElements()) {
      String p = (String) e.nextElement();
      return p + "=" + System.getProperty(p);
    }
    else {
      return null;
    }
  }
}