java常用类的练习题

输入一个字符串，对里面的字符类型进行统计

package chapter13.Test;

/**
 * @Author Java顶针
 * @Version 1.0
 */
public class Test04 {//判断字符串里包含多少个大、小写字母、数字

    public static void main(String[] args) {
        String name = "ASefsfjklAAEf56Effd55";
        CountStr(name);
    }
    public static void CountStr(String str){
        if (str == null) {
            System.out.println("输入不能为空");
            return;
        }
        int numCount = 0;
        int lowerCount = 0;
        int upperCount = 0;
        for (int i = 0; i < str.length(); i++) {
            if (str.charAt(i) >= '0' &&str.charAt(i) <= '9') {
                numCount++;
            }else if (str.charAt(i) <= 'z' && str.charAt(i) >= 'a'){
                lowerCount++;
            }else if (str.charAt(i) <= 'Z' && str.charAt(i) >= 'A'){
                upperCount++;
            }else {
                System.out.println("其他数字不统计");
            }
        }
        System.out.println("小写字母有"+lowerCount+"\t大写字母有"+upperCount+"\t数字有"+numCount);
    }
}