Question

java 用filereader怎么把一个txt文档里的单词添加到一个数组里面

要求读一个文档里面都是句子，然后把里面的单词全都读出来并且把相同的单词删掉，需要用到数组，这里是输出的例子：
比如文档是这样的：The woods are lovely dark and deepBut I have promises to keepAnd miles to go before I sleepAnd miles to go before I sleep输出要求这样：
[the, woods,are,lovely,dark,and,deep,but,i,have,promises,to,keep,miles,to,go,before,sleep]

Answer 1

public class Program {
	public static void main(String[] args) {
		LinkedList<String> words = new LinkedList<String>();
		File file = readFile("./material/ee.txt");
		FileReader reader = null;
		BufferedReader br = null;
		String temp = "";
		try {
			reader = new FileReader(file);
			br = new BufferedReader(reader);
			while ((temp = br.readLine()) != null) {
				temp = temp.toLowerCase();
				String[] split = temp.trim().split(" ");
				for (int i = 0; i < split.length; i++) {
					if (!words.contains(split[i])) {
						words.add(split[i]);
					}
				}
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				br.close();
				reader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		System.out.println(words);
	}

	public static File readFile(String path) {
		File file = new File(path);
		if (file.exists()) {
			return file;
		} else
			return null;
	}
}

运行结果截图：

Answer 2

try(Scanner scanner = new Scanner(new FileReader("word.txt"))){
    ArrayList<String> words = new ArrayList<>(36);
    while(scanner.hasNext()){
        String word = scanner.next().toLowerCase();
        if(! words.contains(word)) words.add(word);
    }
    System.out.println(words);
} catch (IOException e){
}

Answer 3

FileReader reader;
Set<String> result = new HashSet<String>() ;
char[] buffer = new char[1024];
StringBuilder sb = new StringBuilder();
while(true){
int res = reader.read(buffer);
sb.append(buffer);
if(res == -1){
...
break;
}
}
String[] words = sb.toString().split(" ");
for(String word : words){
result.add(word);
}
String[] resArr = result.toArray(new String[0]);