题解 | #统计字符#

import java.util.Scanner;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNextLine()){
            int englishCount = 0;
            int namespaceCount = 0;
            int numberCount = 0;
            int otherCount = 0;
            String inputStr = scanner.nextLine();
            char[] array = inputStr.toCharArray();
            Pattern pattern1 = Pattern.compile("[a-z|A-Z]");
            Pattern pattern2 = Pattern.compile("[0-9]");
            for(char temp : array){
                Matcher matcher1 = pattern1.matcher(String.valueOf(temp));
                if(matcher1.find()){
                    englishCount++;
                    continue;
                }
                Matcher matcher2 = pattern2.matcher(String.valueOf(temp));
                if(matcher2.find()){
                    numberCount++;
                    continue;
                }
                if (" ".equals(String.valueOf(temp))){
                    namespaceCount++;
                    continue;
                }
                otherCount++;
            }
            System.out.println(englishCount);
            System.out.println(namespaceCount);
            System.out.println(numberCount);
            System.out.println(otherCount);
        }
    }
}