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:

Arcuate Artery

Artery that originates from the interlobar arteries of the kidney and forms an arch between the cortex and medulla of the kidney.

Simple Cuboidal Epithelium

A single layer of cube-shaped cells common in glandular ducts and parts of the kidney, specialized for secretion and absorption.

Proximal Convoluted Tubule

A segment of the nephron in the kidney which reabsorbs water, ions, and nutrients from the filtrate.

Urinary Bladder

A hollow muscular organ that stores urine from the kidneys before disposal by urination.