题解 | #统计一句话中重复单词的个数#
统计一句话中重复单词的个数
https://www.nowcoder.com/practice/2128e598b5a5407195c31175b5b33360
主要是要掌握除了字母以外的符号的正则表达式 [^a-zA-Z],使用replaceAll（"[^a-zA-Z]",""）函数，map中的ContainsKey（）和ContainsValue（）。
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String line = scanner.nextLine();
Map<Character, Integer> map = new LinkedHashMap<Character, Integer>();
//write your code here......
line = line.replaceAll("[^a-zA-Z]","");
char[] a = line.toCharArray();
for(int i = 0 ; i < a.length ; i ++){
if(map.containsKey(a[i])){
map.put(a[i],map.get(a[i]) + 1);
}else{
map.put(a[i],1);
}
}
Set<Map.Entry<Character, Integer>> entrys = map.entrySet();
for (Map.Entry<Character, Integer> entry : entrys) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
}
