Core Java Programming Course- Tree Map

This video tutorial explains the concept of a treemap, highlighting its similarities and differences with a hashmap. It covers the implementation of a treemap using a red-black tree structure, ensuring entries are sorted by keys. The tutorial discusses common methods shared with hashmap and unique methods specific to treemap, such as retrieving the first and last entries. Practical examples demonstrate how to use these methods, including advanced techniques like pole first and last entry, which retrieve and remove entries simultaneously.

What is the primary structural difference between a treemap and a hashmap?

• Hashmaps use a binary search tree.

• Treemaps are implemented using a red-black tree.

• Hashmaps are sorted by default.

• Treemaps use a linked list structure.

Which method is used to check if a specific value exists in both treemaps and hashmaps?

• get

• put

• containsValue

• replace

How does the replace method in a treemap differ from the put method?

• Replace can only add new entries.

• Replace updates existing values without adding new ones.

• Put cannot update existing values.

• Replace is slower than put.

What happens to the entries in a treemap when they are added?

• They are sorted by insertion order.

• They remain unsorted.

• They are sorted by keys.

• They are sorted by values.

Which method retrieves and removes the first entry in a treemap?

• pollFirstEntry

• removeFirstEntry

• getFirstEntry

• deleteFirstEntry

What does the method 'firstKey' return in a treemap?

• The first key in the map

• The first removed key

• The first entry in the map

• The first value in the map

Which of the following is a unique method to treemaps?

• containsKey

• firstEntry

• put

• get