利用java内置库的HashMap统计字符串中单词出现的个数问题
没什么好说的，我就直接把代码放上面吧：package com.anduo.map;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Set;import java.util.Map.Entry;public class HashMapTest2 {public static void main(String[] args) {String s = "abbaadfdgdeiivnielo";HashMap<Character, Integer> map = new HashMap<Character, Integer>();char c;for (int i = 0; i < s.length(); i++) {c = s.charAt(i);if (map.get(c) == null) {map.put(c, 1);} else {Integer in = map.get(c);map.put(c, in.intValue() + 1);}}Set<Character> set = map.keySet();for (Character ch : set) {System.out.println(ch + " " + map.get(ch));}System.out.println("----------------------");//另外一种访问方式Set<Entry<Character, Integer>> set1 = map.entrySet();for (Iterator<Entry<Character, Integer>> iterator = set1.iterator(); iterator.hasNext();) {Map.Entry<Character, Integer> entry = (Map.Entry<Character, Integer>) iterator.next();Character ch = entry.getKey();Integer integer = entry.getValue();System.out.println(ch + "" + integer);}}}
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