String - charAt()

String 類別 (class) 有 charAt() 方法 (method)。 可取出String 物件裡的某個字元。

public class StringCharacters {
 public static void main(String args[]){
  String text = "To be or not to be, that is the question;"+
     " Whether 'tis nobler in the mind to suffer"+
     " the slings and arrows of outrageous fortune,"+
     " or to take arms against a sea of troubles," +
     " and by opposing end them?";
  
  int spaces = 0;
  int vowels = 0;
  int letters = 0;
  
  for(int i=0; i < text.length(); i++){
   char ch = Character.toLowerCase(text.charAt(i));
   
   if(ch == 'a' || ch =='e' || ch == 'i' || ch == 'o'|| ch =='u'){
    vowels ++;
   }
   if(Character.isLetter(ch)){
    letters ++;
   }
   if(Character.isSpace(ch)){
    spaces ++;
   }
  }
  
  System.out.println("vowels is : " + vowels + "\nconstants is : " + (letters - vowels) +
    "\nspaces is : " + spaces);
 }
}