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Worksheet 09: Map getOrDefault and computeIfAbsent

Given the documentation for java.util.Map:

Write a do-it-yourself getOrDefault

V getOrDefault(Object key, V defaultValue)

Write a do-it-yourself computeIfAbsent

V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction)

Post Lecture

Synthesize today's class session

What is unclear?