How to use java to realize the letter combination of telephone number

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Given a string that contains only the numbers 2-9, returns all the combinations of letters it can represent.

The number-to-letter mapping is given as follows (same as the phone button). Note that 1 does not correspond to any letters.

Example:

Enter: "23"

Output: [ad "," ae "," af "," bd "," be "," bf "," cd "," ce "," cf ".

Description:

Although the answers above are in dictionary order, you can choose the order in which the answers are output.

Parsing:

This is very similar to the previous question, but the principle is the same, sorting first, and then a for loop and while loop to find the so-called value, if you can find a direct return, otherwise return the one with the smallest difference.

What are the collection classes in Java? the sets in Java are mainly divided into four categories: 1, List list: ordered, repeatable; 2, Queue queue: ordered, repeatable; 3, Set collection: non-repeatable; 4, Map mapping: disorder, key unique, value is not unique.

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