英文:
How Can I Read 2 lines From txt File
问题
private List
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) {
if (!line.startsWith("--")) { // Skip lines starting with "--"
quotes.add(line);
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return quotes;
}
英文:
Hey Guys My I am Dealing With This Issue
I Want To merge to line from txt file and show them in Arraylist
So My Code Is That And I Want To Skip The -- Line To Show in Arraylist..
private List<String> 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;
}
txt File image is here
1: https://i.stack.imgur.com/AiI67.png
答案1
得分: 1
你可以在将其添加到引用列表之前,检查该行是否不等于 --。
if (line.equals("--") == false) {
quotes.add(line);
}
编辑:将行合并在一起
为了将 -- 行之间的字符串组合起来,你可以在每个 -- 之间累积引用到一个字符串 quoteLine
中。因此,如果该行不是 -- 行,它将被附加到字符串 quoteLine
。如果是 -- 行,则将先前构建的引用添加到数组列表中,并将 quoteLine
初始化为空字符串以进行重置。
String line;
String quoteLine = "";
while ((line = bufferedReader.readLine()) != null) {
if (line.equals("--") == false) {
quotes.add(quoteLine);
quoteLine = "";
} else {
quoteLine += line;
}
}
英文:
You could check if the line is not equal to -- before adding it to the quotes list.
if(line.equals("--") == false) {
quotes.add(line);
}
Edit: Combining the lines together
In order to combine the strings between the -- lines you could accumulate the quote into a string quoteLine
between each --. So if the line is not a -- line then it will be appended to the string quoteLine
. If it is a -- line then it will add the previously constructed quote to the array list and initialize quoteLine
to an empty string to reset it.
String line;
String quoteLine = "";
while ((line = bufferedReader.readLine()) != null) {
if(line.equals("--") == false) {
quotes.add(quoteLine);
quoteLine = "";
} else {
quoteLine += line;
}
}
答案2
得分: 1
尝试使用 replaceAll 方法,然后按照上述方式读取文件。
line = line.replaceAll("--", " ");
//将所有的 "--" 替换为空格
英文:
try to use replaceAll method then read the file as above
line = line.replaceAll("--"," ");
//to remove all "--" and replace it with a space
答案3
得分: 1
这是一个文本文件..
这是一个诗歌应用.. 这两行组成一首诗
因此,我想在我的Recyclerlist View中一起显示每两行..
这是示例...
我想在Recycler View中像这样显示我的诗歌:
英文:
This is Txt File ..
This Is A Poetry App.. This 2 Lines Make 1 poetry
So I Want To Display every 2 lines together In My Recyclerlist View..
This The Example...
i Want To Display My Poetry Like This In Recycler View
答案4
得分: 0
你可以像这样做:
public static List<List<String>> getQuotes(String file) {
List<List<String>> allQuotes = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
// 让我们使用由 LinkedList 支持的队列,以保留下一个行为 '--' 的前两行。
Queue<String> quotes = new LinkedList<>();
String line;
while ((line = br.readLine()) != null) {
// 如果当前行以 -- 开头,并且前两行在引号队列中持久化,
// 则将其添加到 allQuotes,并清空引号。如果你确定每行中没有前导和尾随空格,
// 并且它总是以 -- 开头,你可以在此处进行相等性检查。
if (line.trim().startsWith("--")) {
// 当引号队列为空时,不要将引号添加到 allQuotes。
// 如果你希望每个子列表中始终至少有两个引号,
// 你还可以检查 quotes.size() == 2 以及 !quotes.isEmpty()。
if (!quotes.isEmpty()) {
allQuotes.add(new ArrayList(quotes));
quotes.clear();
}
} else if (!line.trim().isEmpty()) {
// 如果行不为空白或不是 --,则将每行添加到引号队列中。
quotes.add(line);
}
// 如果队列的大小 > 2,则从前面移除一个项,
// 因为我们只关注 -- 前的两行。
if (quotes.size() > 2) {
quotes.remove();
}
}
} catch (Exception e) {
e.printStackTrace(); // TODO: 处理异常
return null;
}
return allQuotes;
}
英文:
You can do something like this:
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;
}
答案5
得分: 0
我认为也许你想要类似这样的代码:
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;
}
结果是一个 List<List<String>>
:一个包含诗歌的列表,每首诗在自己的 List<String>
中。
英文:
I think perhaps you want something more like this:
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;
}
The result is a List<List<String>>
: a list of poems, with each poem in its own List<String>
.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库,让每个人都能够通过互相帮助和分享经验来进步。
评论