Question

How can set the flag to set the condition of displaying a message only once when the application gets loaded in Java Language.

Thanks,
david

Answer 1

You could use a global flag store, based on enum because we want Singleton behaviour. It could look like this:

public enum Flag {
    APPLICATION_LOADED(false), NEED_SAVING(true), CAN_EXIT(false) /*, ... */;

    private boolean state;
    private Flag(boolean initialState) {
      this.state = initialState;
    }

    public boolean getState() {return state;}
    public void setState(boolean state) {this.state = state;}
}

and use it like this

private void startApplication() {
  // perform startup sequence

  APPLICATION_LOADED.setState(true);
}

and later

private void showMessage(Flag flag) {
  if (flag.getState() == false) {
    // perform displaying
  }
}