Question

编程统计用户从键盘输入的字符串中所包含的字母,数字和其他字符的个数.怎样用java编写？

Answer 1

将读取的字符串遍历截取

Answer 2

import java.util.LinkedHashMap;
import java.util.Map;

public class AddUpCharacter {
public static void main(String[] args) {
Map<Character, Integer> map = addUp("abcab_34223");
for (char c : map.keySet()) {
System.out.println(c + " : " + map.get(c));
}
}

public static Map<Character, Integer> addUp(String source) {
Map<Character, Integer> map = new LinkedHashMap();
for (char c : source.toCharArray()) {
if (!map.containsKey(c)) {
map.put(c, 0);
}
map.put(c, map.get(c) + 1);
}
return map;
}
}