输入一个字符串，判断它有几个字母、几个数字、或其他的字符

public static void main(String[] args) {

int count_abc=0,count_ num=0,count_oth=0;
//输入一串数
Scanner scan=new Scanner(System.in);
String str = scan.next();
char[] chars = str.toCharArray();
//判断每个字符
for(int i = 0;i<chars.length;i++){
if((chars[i]>=65&&chars[i]<=90)||(chars[i]>=97&&chars[i]<=122)){
count_abc++;
}else if(chars[i]>=48&&chars[i]<=57){
count_ num++;
}else{
count_oth++;
}
}
System.out.println("字母有："+count_abc+"个");
System.out.println("数字有："+count_ num+"个");
System.out.println("其他的有："+count_oth+"个");
}