count letters numbers and characters
public static String countLetter(String str){
String abc=str;
int a=0,b=0;
while(str.length()>0){
int i=0;
String ch=str.substring(i,i+1);
if(ch.matches(".*[a-zA-Z].*")){
a++;
}else if (ch.matches(".*[0-9].*")){
b++;
}
str=str.substring(i+1);
}
return abc + " has "+a+" letters "+b+" digit
and "+(abc.length()-(a+b))+" other characters ";
OR+++++++++++++++++++++++++++++++++
static void findSum(String str)
{
int total= str.length();
str = str.replaceAll("\s", "");
int num =0;
int letter=0;
int i=0;
while(i<str.length()){
char ch = str.charAt(i);
// if current character is a digit
if (Character.isDigit(ch))
num ++;
// if current character is an alphabet
else {
letter++;
}
i++;
}
System.out.println(letter + " letters -> "+num +
" numbers -> "+ (total-letter-num) + " other chars");
}