java统计短单词的个数

//by ysy 2018年3月6日

public class 统计短单词的数量 {
//--------------------统计短单词的个数----------------------------
@Test
public void testName0() throws Exception {
long count = Files.lines(Paths.get("src/java8.txt"), Charset.defaultCharset()).parallel()
// 字符串流--分割--字符串流
.flatMap(str -> Arrays.stream(str.split("[^a-zA-Z]+")))
// 去掉\n
.filter(word -> word.length() >0)
.filter(word -> word.length() < 12 )
.count();
System.out.println(count);
}

@Test
public void testName_1() throws Exception {
// Stream
String conts = new String(Files.readAllBytes(Paths.get("src/java8.txt")));
// 将字符串分割为单词
List<String> asList = Arrays.asList(conts.split("[^a-zA-Z]+"));
long count = asList.stream()
.parallel()
.filter(word -> word.length() >0)
.filter(s -> s.length() < 12)
.count();
System.out.println("短单词个数" + count);

}
//如何手工统计呢,版本1:不支持并发
@Test
public void testName() throws Exception {
int count[]=new int[12];
String conts=new String(
Files.readAllBytes(Paths.get("src/java8.txt"))
);
List<String> asList = Arrays.asList(conts.split("[^a-zA-Z]+"));
System.out.println(asList);
asList.stream()
//	        	    .parallel()
.forEach(s->{
if (s.length()<12 && s.length()>0) {
count[s.length()]++;
}
});

int sum= IntStream.of(count)
.sum();
System.out.println("总个数:"+sum);
}

//改进,使用AtomicInteger,支持并发
@Test
public void testName2() throws Exception {
AtomicInteger count = new AtomicInteger(0);
String conts=new String(
Files.readAllBytes(Paths.get("src/java8.txt"))
);
List<String> asList = Arrays.asList(conts.split("[^a-zA-Z]+"));
System.out.println(asList);
asList.stream()
.parallel()
.forEach(s->{
if (s.length()<12 && s.length()>0) {
count.incrementAndGet();
}
});

System.out.println("总个数:"+count.get());
}

}