Hello,

i have the following problem: in my application, one or more thread must
be able to read some information, all together if they want to. At the
same time, one thread must be able to modify the informations, and the
readers must not gain access when the writer thread is writing.

But one reader must not prevent another reader to access the informations.

Let's say the informations is in the class:

public class Informations {
  /** Write access. */
  public void modify() {
     // some stuff...
  }

  /** Read access. */
  public Object getValue(String key) {
     // some code...
  }
}

What synchronized/flag/else should i put in order to make it work?

TIA