代码
public class Test {
public static void main(String[] args) {
String words = "Look buddy, U got work hard and put yourself in your java, Once you learned the heart of the java, I can guarantee that you win.";
//正则匹配
String reg = "[a-zA-Z]+";
Pattern p = Pattern.compile(reg);
Matcher m = p.matcher(words);
// 存放单词的集合
HashMap<String, Integer> map = new HashMap<String, Integer>();
int count = 0;// 单词总数
while (m.find()) {
count++;
String w = m.group();
if (null == map.get(w)) {// 此单词集合中没有 添加 数量为1
map.put(w, 1);
} else {// 已有 添加 数量+1
int x = map.get(w);
map.put(w, x + 1);
}
}
// 单词总数
System.out.println("单词总数:" + count);
// 遍历集合keySet
Set<String> set = map.keySet();
Iterator<String> i1 = set.iterator();
while (i1.hasNext()) {
String key = i1.next();// key
Integer value = map.get(key);// 值
System.out.println("单词:" + key + " 出现次数:" + value);
System.out.println("------------------------------------------");
}
}
}
结果
单词总数:26
单词:Look 出现次数:1
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单词:buddy 出现次数:1
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单词:work 出现次数:1
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单词:heart 出现次数:1
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单词:put 出现次数:1
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单词:can 出现次数:1
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单词:your 出现次数:1
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单词:you 出现次数:2
------------------------------------------
单词:win 出现次数:1
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单词:the 出现次数:2
------------------------------------------
单词:I 出现次数:1
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单词:in 出现次数:1
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单词:and 出现次数:1
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单词:U 出现次数:1
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单词:that 出现次数:1
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单词:of 出现次数:1
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单词:Once 出现次数:1
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单词:learned 出现次数:1
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单词:guarantee 出现次数:1
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单词:java 出现次数:2
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单词:yourself 出现次数:1
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单词:got 出现次数:1
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单词:hard 出现次数:1
------------------------------------------