java program to check no. of Uppercase , lowercase and digits in a Given String
import java.util.*;
class String_Check_UPP_Low_NUm {
    public static void main(String [] args){
        int upper=0,lower=0,digit=0;
        Scanner sc = new Scanner (System.in);
        String str = sc.nextLine();
        for(int idx = 0;idx<str.length();idx++){
            char c = str.charAt(idx);
            if(c>='A' && c<='Z'){
                upper++;
            }
            else if(c>='a' && c<='z'){
                lower++;
            }
            else if(c>='0' && c<='9'){
                digit++;
            }
        }
        System.out.println("Upper::" + upper);
        System.out.println("Lower::" + lower);
        System.out.println("Digits::" + digit);
        sc.close();
    }
}
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