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Java Collections Challenge

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Java Collections Challenge

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About this activity

Solve riddles about Java's collection types.

Created by

Swati Nikam
Swati Nikam
India

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Java Collections Challenge
 

Java Collections ChallengeOnline version

Solve riddles about Java's collection types.

by Swati Nikam
1

You manage a to-do list that grows as users add tasks and must preserve the order of entry while allowing duplicates. You frequently access items by their position.

Hints

Common in Java for managing a resizable sequence with index-based access.

Elements stay in the same order as they were inserted.

The collection changes size as you add or remove elements.

2

I store unique elements and ignore duplicates, helpful for membership checks.

Hints

Often implemented as a hash-based collection.

Used for fast lookups by element.

I never keep duplicates.

3

I map keys to values, letting you fetch data by a key rather than by position.

Hints

A common hash-based associative container.

Allows quick retrieval using the key.

Pairs of (key, value) are stored together.

4

I preserve insertion order while mapping keys to values, so iteration reflects the way I was filled.

Hints

Useful when order matters during traversal.

Combines a map with a linked structure.

Keeps the order you add entries in.

5

I traverse a collection element by element, without exposing its internal structure.

Hints

Used to loop through various collections.

Often comes with hasNext to check for more.

Next moves you to the following element.

 
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