Your Program Uses a Map Structure to Store a Number

question 84

Multiple Choice

Your program uses a Map structure to store a number of user ids and corresponding email addresses. Although each user must have a unique id, two or more users can share the same email address. Select an appropriate expression to complete the method below, which adds a new id and email address to the map only if the id is not already in use. If the id is already in use, an error message is printed. public static void addUserID(Map<String, String> users, String id, String email)
{
String currentEmail = users.get(id) ;
If (___________________)
{
Users.put(id, email) ;
}
Else
{
System.out.println(id + " is already in use.") ;
}
}

• A) currentEmail.equals(email)
• B) !currentEmail.equals(email)
• C) currentEmail == null
• D) currentEmail != null

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Definitions:

Annual Meeting

A yearly gathering of a company's shareholders or members to discuss its affairs, review financial statements, and elect board members.

Special Meetings

Meetings called for a specific purpose, outside of the regular schedule of meetings, often requiring a special notice for attendance.

Per Share Value

The monetary value assigned to each individual share of stock in a company.

Minority Shareholder

An investor who owns less than 50% of a company's shares and therefore has less influence on corporate decisions compared to majority shareholders.