Given a string, flip each word in the string one by one. (java)

Given oneString, flip each word in the string one by one.

Example 1:
 Enter: "the sky is blue"
 Output: "blue is sky the"

• 1
• 2
• 3

AI writing code

Brush this one todayalgorithmI felt a lot when I was asked. java 4 lines of code, each line is valuable. The road to advancement is still long, come on! ! !

Code

public class ReverseWords {

    public String reverseWords(String s){
        //Remove the spaces at the beginning and end
        s = s.trim();
        //Regularly match continuous whitespace characters as separator split
        List<String> wordList = Arrays.asList(s.split("\\s+"));
        //Invert the string
        Collections.reverse(wordList);
        //Split string
        return String.join(" ",wordList);
    }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12

AI writing code

Knowledge points

The () method is used to delete the beginning and end of the string.

()WillArrayConvert to list, is a static method of the Arrays class in the package in JDK

3.split("\s+") is used to split a string and returns an array.
Here \s represents space, carriage return, line break and other whitespace characters.
+ OK means one or more meanings.

A class contains static methods that operate on or return a collection.
The reverse() method here is to reverse the string.

5.String.join(): Stitching string. There are 2 parameters, the first parameter is a splicing symbol, and the second parameter is an array and a collection.

Attached:
Collections provides the following methods to sort List:
void reverse(List list): Invert
void shuffle(List list), random sort
void sort(List list), sort in ascending order in natural sort
void sort(List list, Comparator c); Custom sorting, the sorting logic is controlled by Comparator
void swap(List list, int i, int j), swap elements of two index positions
void rotate(List list, int distance), rotate.
When distance is a positive number, move the entire distance element after list to the front.
When distance is negative, move the first distance element of list to the back as a whole.