program to calculate product of each column in matrix

Write a java program to count words in a string : 

import java.util.Scanner;

public class CountWord {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter Sentence ");

String str = sc.nextLine();

int c=countWord(str);

System.out.println(c);

}

private static int countWord(String str) {

char ch[] = str.toCharArray();

int count=0;

for (int i = 0; i < ch.length; i++) {

if((i==0 && ch[i]!=' ' )|| (ch[i]!=' ' && ch[i-1]==' ')) {

count++;

}

}

return count;

}

}