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"); }
