输入字符，统计分类

package com.Demo.String;

import java.util.Scanner;

public class Demo5_Scanner { // 输入字符，统计分类

public static void main(String[] args) {
int big = 0;
int num = 0;
int small = 0;
int outher = 0;

Scanner sc = new Scanner(System.in);
String s1 = sc.nextLine();
sc.close();

/*//遍历转换判定 
* for (int i = 0; i <s1.length(); i++) { 
                    char a = s1.charAt(i); //
* System.out.println(a);
* 
* if (a >= 'A' && a <= 'Z') {
* 
* big++; } else if (a >= 'a' && a <= 'z') { small++; } else if (a >= '0' && a
* <= '9') { num++; }else { outher++; }
* 
* }
*/
//截取后正则式判定
for (int i = 0; i < s1.length(); i++) {
int j = 0;

if (i == s1.length())
j = i;
else
j = i + 1;

String a = s1.substring(i, j);
if (a.matches("[A-Z]")) {
big++;
} else if (a.matches("[a-z]")) {
small++;

} else if (a.matches("[0-9]")) {
num++;
} else
outher++;

}

System.out.println("big " + big + " small " + small + " num " + num + " outher " + outher);
}

}