Java split how to remove a space and multiple spaces

You can use the Split function to get rid of spaces in a string and generally store it in a string array

For example:

Import Java.util.Scanner;  
  
public class Main {public  
  
  
    static void Main (string[] args) {  
        Scanner in = new Scanner (system.in);  
        String s=in.nextline ();   If I enter: 0 1 2 3 4
        string[] Str=s.split ("");
        System.out.println (s);
        System.out.println (Str[3]);
        
    }  
  

The output results are:

0 1 2 3 4

3

However, if I enter 0 1 2 3 4, there are 2 spaces between 3 and 3, would that still be useful.

The resulting output is:

0 1 2 (space) 3 4

Spaces

That is, there is no output STR[3], at least it looks like this, and then I came to the conclusion that, actually,

For example, I enter 2 (empty) (empty) 3, the string str array that is executed after the split function.

Is str[0]=2, str[1]= (empty), str[2]= (empty), str[3]=3

In other words, the split function in the execution of multiple space to judge, will only ignore the first space, the remaining spaces are placed in the array, until the number of spaces 3, and then repeat the situation, only a space, the situation is the result is ideal, multiple spaces, but also repeat so

Workaround:

Import Java.util.Scanner;  
  
public class Main {public  
  
  
    static void Main (string[] args) {  
        Scanner in = new Scanner (system.in);  
        String s=in.nextline ();
        String[] Str=s.split ("\\s+");   Change here
        System.out.println (s);
        System.out.println (Str[3]);
        
    }  
  

Using regular expressions, we can achieve our desired results,

For example: Enter 2 (empty) (empty) (empty) 3

Result: str[0]=2

Str[1]=3