java 判断一个字符中字母数字个数

public static void getCounts(String string) {
int count_abc=0, count_num=0, count_oth=0;
char[] chars = string.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");
}