garybaylor / java_code Goto Github PK

public static void count(String s, char a) {
        int index = 0;
        int count = 0;
        int n = s.length();
        while(index < n) {
            if(s.charAt(index) == a) {
                count = count + 1;
            }
            index = index + 1;
        }
        System.out.println(a + " appears " + count + " times in String: " + s);
    }

s appears 4 times in String: This is just  a test!

class HelloWorld {
    public static void main(String[] args){
        String a = "This is just  a test!";
        traverse(a);
    }

    public static void traverse(String s){
        int index  = 0;
        int n = s.length();
        while(index < n) {
            char k = s.charAt(index);
            System.out.println(k);
            index = index + 1;
        }
    }
}

run:
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