字符类型统计

分别统计英文字符的数量，中文字符的数量，和数字字符的数量，假设字符中没有中文字符、英文字符、数字字符之外的其他特殊字符。

public class Counter2
{
    public static void main(String[] args)
    {
        String str = "aaaabbc中国1512";
        int engishCount = 0;
        int chineseCount = 0;
        int digitCount = 0;
        for(int i=0;i<str.length();i++)
        {
            char ch = str.charAt(i);
            if(ch>='0' && ch<='9')
            {
                digitCount++;
            }
            else if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
            {
                engishCount++;
            }
            else
            {
                chineseCount++;
            }
        }
        System.out.println("digitCount" +digitCount);
        System.out.println("engishCount" +engishCount);
        System.out.println("chineseCount" +chineseCount);

    }
}