Java中统计字符出现个数和单词出现个数（Map解决）

深碍√TFBOYSˉ_ 2022-07-16 09:29 185阅读 0赞

import java.util.*;
    
    /**
     * Created by cuboo on 2016/10/13.
     */
    public class test {
        private static Scanner scanner;
        public static void main(String agrs[]){
               count_word();
        }
        //统计每个字符出现的次数
        public static void count_char(){
            scanner = new Scanner(System.in);
            String line = scanner.nextLine();
            int[] nums = new int[256];
            for (int i = 0; i < line.length(); i++) {
                nums[line.charAt(i)]++; //数组256个下标以此表示256个字符  line.charAt(i)的转换成字符对应的数字
                //根据数字下标统计每个字符出现的次数
            }
            for (int i = 0; i < nums.length; i++) {
                if (nums[i] != 0){//输出字符出现的次数
                    System.out.println((char) i+":"+nums[i]+"\t");
                }
            }
        }
        /*
        *统计每个字符/单词出现的次数
         */
        public static void count_word(){
            scanner = new Scanner(System.in);
            String line = scanner.nextLine();
            String[] strs = line.split(" ");
            Map<String,Integer> map = new HashMap<>();
    
            for (int i = 0; i < strs.length; i++) {
                if (map.containsKey(strs[i])){//匹配map是否包含单词key
                    map.put(strs[i],map.get(strs[i])+1);//将单词key的值加1
                }else {
                    map.put(strs[i],1);//第一次出现的向map添加单词为key，值为1
                }
    
            }
            System.out.println(map.keySet()+":"+map.values());
        }
    }