public class LetterAndNumberCount {
    public static void main(String[] args) {
        Count("FJJgjsgfsd543632");
        count1("SFsefgdg2354354fsdf");
    }
    public static void Count(String str){
        int A = 0;
        int a = 0;
        int Number = 0;
        byte[] bytes = str.getBytes();  //
 
 將字串轉為byte陣列
        for(int i=0;i<bytes.length;i++){
            if(bytes[i] >= 'a' && bytes[i] <= 'z'){
                a++;
            }else if(bytes[i]>='A' && bytes[i]<='Z'){
                A++;
            }else if(bytes[i]>='0' && bytes[i]<='9'){
                Number
 
++;
            }
        }
        System.out.println("大寫字母個數為："+ A);
        System.out.println("小寫字母個數為："+ a);
        System.out.println("數字個數為："+ Number);
    }
    
    public static void count1(String str){
        int A = 0;
        int a = 0;
        int Number = 0;
        for(int i=0;i<str.length();i++){
            
 
char array  = str.charAt(i); //便利陣列後用charAt(i)來返回指定字元然後if進行判斷
            if(array >= 'a' && array <= 'z'){
                a++;
            }else if(array>='A' && array<='Z'){
                A++;
            }else if(array>='0' && array<='9'){
                Number++;
            }
        }
        System.out.println("大寫字母個數為："+ A);
        System.out.println("小寫字母個數為："+ a);
        System.out.println("數字個數為："+ Number);
        }
}