Java Count Number Of Words In A String

//How to Count Number Of Words

import java.util.Scanner;

class CountNumberOfWord{
    
static String str;

static int count(String temp){
    
str=temp;

String[] word = str.split(" ");  

int flag=0;

for(int i=0;i<=word.length-1;i++){
    
flag+=1;

}

return flag;

}

public static void main(String...s){
    
    System.out.println("Please enter a sentence");
    
    Scanner input=new Scanner(System.in);
    
    String str1= input.nextLine();
    
    int k=count(str1);
    
    System.out.println("Total Number of Word in Entered Sentence are: ");
    
    System.out.println(k);
}
}

Please enter a sentence
Java Count number example
Total Number of Word in Entered Sentence are: 
4