public class Count{
    public static void main(String args[]){
        int j=0,k=0;
        char x='n';
        char y='o'; 
        String s="want you to know one thing";
        char a[]=s.toCharArray();
        for(int i=0;i<a.length;i++){
            if(x==a[i]){
                j++;
            }
            if(y==a[i]){
                k++;
            }
        }
            System.out.println("字母n出现的次数："+j+"次  "+"字母o出现的次数："+k+"次");
    }
}