[英]How Can I Read 2 lines From txt File
嘿伙計們,我正在處理這個問題,我想從 txt 文件合並到行並在 Arraylist 中顯示它們,所以我的代碼就是這樣,我想跳過 -- 行以在 Arraylist 中顯示..
私人列表 getQuotes(){
List<String> quotes = new ArrayList<>();
BufferedReader bufferedReader = null;
try {
InputStream open = getAssets().open("barish.txt");
bufferedReader = new BufferedReader(new InputStreamReader(open));
String line;
while ((line = bufferedReader.readLine()) != null) {
quotes.add(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return quotes;
}
[在此處輸入圖片說明][1]
txt 文件圖像在這里 [1]: https : //i.stack.imgur.com/AiI67.png
在將其添加到引號列表之前,您可以檢查該行是否不等於 --。
if(line.equals("--") == false) {
quotes.add(line);
}
編輯:將線條組合在一起
為了組合 -- 行之間的字符串,您可以將引號累積到每個 -- 之間的字符串quoteLine
。 因此,如果該行不是 -- 行,那么它將被附加到字符串quoteLine
。 如果它是一個 -- 行,那么它會將先前構造的引號添加到數組列表中,並將quoteLine
初始化為空字符串以重置它。
String line;
String quoteLine = "";
while ((line = bufferedReader.readLine()) != null) {
if(line.equals("--") == false) {
quotes.add(quoteLine);
quoteLine = "";
} else {
quoteLine += line;
}
}
嘗試使用replaceAll方法然后讀取文件如上
line = line.replaceAll("--"," ");
//刪除所有“--”並將其替換為空格
你可以這樣做:
public static List<List<String>> getQuotes(String file) {
List<List<String>> allQuotes = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
// Let's have a queue backed by LinkedList to keep the two
// lines just before the next line that is '--'.
Queue<String> quotes = new LinkedList<String>();
String line;
while ((line = br.readLine()) != null) {
// If the current line starts with -- and the two previous lines persisted
// in the quotes queue to allQuotes and clear the quotes. You can do an equals
// check here if you're certain about no leading and trailing white spaces in
// each line and it is always --.
if (line.trim().startsWith("--")) {
// Don't add quotes to allQuotes when quotes queue is empty.
// You can also check quotes.size() == 2 along with !quotes.isEmpty()
// if you want to always have at least two quotes in each sub-list retuned.
if (!quotes.isEmpty()) {
allQuotes.add(new ArrayList(quotes));
quotes.clear();
}
} else if (!line.trim().isEmpty()) {
// Add each line into the quotes queue if it is not blank
// or if it is not --
quotes.add(line);
}
// If the size of queue is > 2 remove an item from from the front,
// because we are only interested in two lines before --
if (quotes.size() > 2) {
quotes.remove();
}
}
} catch (Exception e) {
e.printStackTrace(); // TODO: Handle exceptions
return null;
}
return allQuotes;
}
我想也許你想要更像這樣的東西:
public List<List<String>> getQuotes() {
List<List<String>> allQuotes = new ArrayList<>();
BufferedReader bufferedReader = null;
try {
InputStream open = getAssets().open("barish.txt");
bufferedReader = new BufferedReader(new InputStreamReader(open));
String line;
ArrayList<String> quote = new ArrayList<>();
while ((line = bufferedReader.readLine()) != null) {
if (line.equals("--")) {
if (!quote.isEmpty()) {
allQuotes.add(quote);
}
quote = new ArrayList<>();
} else {
quote.add(line);
}
}
if (!quote.isEmpty()) {
allQuotes.add(quote);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return allQuotes;
}
結果是一個List<List<String>>
:一個詩歌列表,每首詩歌都在它自己的List<String>
。
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