Fifth week of the experimental study Summary & Report III

experimental report:

Experiment a well-known string: "this is a test of java" Do the following requirements:

1: count the number of letters in the string s occurs in

Experiment code:

package Java11;

public class TZQD {

                public static void main(String[] args) {
                String r = "this is a test of java";
                int sum = 0;
                char[] c = r.toCharArray();
                for (int i = 0; i < c.length; i++) {
                if (c[i] == 's') {
                sum++;
            }}
                System.out.println("S的个数为"+sum);

}

}