How to convert java Map

Explanation

1. The map() method is an intermediate operation. It returns a stream including the results of applying the given function to each element in the stream.

2. The intermediate operation Map can help us process each element in the List.

Example

Through map we convert each string to uppercase.

stringCollection
    .stream()
    .map(String::toUpperCase)
    .sorted((a, b) -> b.compareTo(a))
    .forEach(System.out::println);
 
// "DDD2", "DDD1", "CCC", "BBB3", "BBB2", "AAA2", "AAA1"

What collection classes are there in Java?

Collections in Java are mainly divided into four categories:

1. List: ordered, repeatable;

2. Queue: ordered and repeatable;

3. Set: non-repeatable;

4. Map: unordered, with unique keys and non-unique values.

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