题解 | #统计字符#

统计字符

http://www.nowcoder.com/practice/539054b4c33b4776bc350155f7abd8f5

Java 利用正则表达式

import java.util.*;
public class Main {
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            while(sc.hasNextLine()) {
                String str = sc.nextLine();
                String str1 = str.replaceAll("[^a-zA-Z]", "");
                String str2 = str.replaceAll("[^ ]", "");
                String str3 = str.replaceAll("[^0-9]", "");
                String str4 = str.replaceAll("[a-zA-Z0-9 ]", "");
                System.out.println(str1.length());
                System.out.println(str2.length());
                System.out.println(str3.length());
                System.out.println(str4.length());
            }
        }
}

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CrissKu

University of Malaya Java

String s = new Scanner(System.in).nextLine(); //利用正则表达式，替换replaceAll（删除）别的。剩下的就是要求的长度 System.out.println(s.replaceAll("[^a-zA-Z]","").length()); System.out.println(s.replaceAll("\\S","").length()); System.out.println(s.replaceAll("\\D","").length()); System.out.println(s.replaceAll("[\\s\\da-zA-Z]","").length());

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发布于 2022-07-05 20:01

Faranado

大连民族大学 Java

还是正则表达式帅，我这个写的非常丑陋 public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()) { String str = in.nextLine(); str = str.toLowerCase(); String engCh = "abcdefghijklmnopqrstuvwxyz"; String figCh = "0123456789"; String space = " "; int countEng = 0; int countFig = 0; int countSpace = 0; int elseCh = 0; for (int i = 0; i < str.length(); i++) { if (engCh.contains(Character.toString(str.charAt(i)))) { countEng++; } else if (figCh.contains(Character.toString(str.charAt(i)))) { countFig++; } else if (space.contains(Character.toString(str.charAt(i)))) { countSpace++; } else { elseCh++; } } System.out.println(countEng); System.out.println(countSpace); System.out.println(countFig); System.out.println(elseCh); } }

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发布于 2022-10-17 18:40 广东