3.編寫壹個程序，統計出某個字符串中大寫英文字母個數、小寫英文在字母個數、數字的個數。substring java

public?class?Test?{

public?static?void?main(String[]?args)?{

Scanner?sc?=?new?Scanner(System.in);

int?upperCase?=?0;

int?lowCase?=?0;

int?num?=?0;

System.out.println("請輸入任意字符串");

String?s?=?sc.next();

char[]?letters?=?s.toCharArray();

for(int?i=0;i<letters.length;i++){

if('0'<=letters[i]&&'9'>=letters[i]){

num++;

}else?if('a'<=letters[i]&&'z'>=letters[i]){

lowCase++;

}else?if('A'<=letters[i]&&'Z'>=letters[i]){

upperCase++;

}

}

System.out.println("字符串:"+s+"?中小寫字母個數："+lowCase);

System.out.println("字符串:"+s+"?中大寫字母個數："+upperCase);

System.out.println("字符串:"+s+"?中數字個數："+num);

sc.close();

}

}