Java两种方法统计单词个数

编写一个程序，用来统计一段文本中各个单词的出现次数，假设单词不区分大小写

方法一：
package coding;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
	public static void main(String[] args) {
		String some = "Some are born great,some achieve greatness,and some have greatness thrust upon them。";
		some = some.toLowerCase();//全部默认为小写
		String are = "[a-zA-Z]+";
		Pattern s = Pattern.compile(are);
		Matcher m = s.matcher(some);
		HashMap<String, Integer> a = new HashMap<String, Integer>();
		while (m.find()) {
			String g = m.group();
			if(null == a.get(g)){
				a.put(g, 1);
				}
			else {
				int i = a.get(g);
				a.put(g, i + 1);
				}
			}
		Set<String> set = a.keySet();
		Iterator<String> i= set.iterator();
		while(i.hasNext()) {
			String key = i.next();
			Integer value = a.get(key);
			System.out.println(key + "出现了" +