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public class BankOperations {
  public static boolean initialized = false;
  public BankOperations() {
    if (!performSSNVerification()) {
       throw new SecurityException("Invalid SSN!"); 
    }  
    else
      initialized = true;	  
  }
  
  private boolean performSSNVerification() {
    return false;
  }
  
  public static void greet() {
    if(initialized == true) {
      System.out.println("Welcome user! You may now use all the features.");
      //other authorized code
    }
    else
      System.out.println("You are not permitted!");
  }
}