Given: ConcurrentMap <String, String> PartList = new ConcurrentMap<>(); Which fragment puts a key/value pair in partList without the responsibility of overwriting an existing key?

The correct answer is B. partList.putIfAbsent(key,"Blue Shirt"). putIfAbsent(K key, V value) If the specified key is not already associated with a value, associate it with the given value.

Concurrency

Question

Given:

ConcurrentMap <String, String> PartList = new ConcurrentMap<>(); Which fragment puts a key/value pair in partList without the responsibility of overwriting an existing key?

Options

ApartList.out(key,"Blue Shirt");
BpartList.putIfAbsent(key,"Blue Shirt");
CpartList.putIfNotLocked (key,"Blue Shirt");
DpartList.putAtomic(key,"Blue Shirt")
Eif (!partList.containsKey(key)) partList.put (key,"Blue Shirt");

How the community answered

(30 responses)

A
3% (1)
B
70% (21)
C
7% (2)
D
3% (1)
E
17% (5)

Explanation

putIfAbsent(K key, V value) If the specified key is not already associated with a value, associate it with the given value.

Topics

#ConcurrentMap#putIfAbsent#atomic operations#thread-safe collections

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