Java 将文本文件读入数组列表
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Reading text file into arraylist
提问by Audrey
I really new to Java so I'm having some trouble figuring this out. So basically I have a text file that looks like this:
我对 Java 真的很陌生，所以我在弄清楚这一点时遇到了一些麻烦。所以基本上我有一个看起来像这样的文本文件：
1:John:false
2:Bob:false
3:Audrey:false
How can I create an ArrayList from the text file for each line?
如何从文本文件中为每一行创建一个 ArrayList？
采纳答案by Priyansh Goel
Read from a file and add each line into arrayList. See the code for example.
从文件中读取并将每一行添加到 arrayList 中。例如，请参阅代码。
public static void main(String[] args) {
ArrayList<String> arr = new ArrayList<String>();
try (BufferedReader br = new BufferedReader(new FileReader(<your_file_path>)))
{
String sCurrentLine;
while ((sCurrentLine = br.readLine()) != null) {
arr.add(sCurrentLine);
}
} catch (IOException e) {
e.printStackTrace();
}
}
回答by Danny0317
While the answer above me works, here's another way to do it. Make sure to import java.util.Scanner.
虽然我上面的答案有效，但这是另一种方法。确保导入 java.util.Scanner。
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
Scanner scan = new Scanner("YOURFILE.txt");
while(scan.hasNextLine()){
list.add(scan.nextLine());
}
scan.close();
}
回答by Toshan
This will be help to you.
这将对您有所帮助。
List<String> list = new ArrayList<String>();
BufferedReader reader = new BufferedReader(new FileReader("list.txt"));
String line;
while ((line = reader.readLine()) != null) {
list.add(line);
}
reader.close();
Then you can access those elements in the arraylist.
然后您可以访问数组列表中的这些元素。
回答by Hector
java 8 lets you do this
java 8 可以让你做到这一点
String fileName = "c://lines.txt";
List<String> list = new ArrayList<>();
try (Stream<String> stream = Files.lines(Paths.get(fileName))) {
list = stream
.map(String::toUpperCase)
.collect(Collectors.toList());
} catch (IOException e) {
e.printStackTrace();
}
list.forEach(System.out::println);
回答by Vikas Suryawanshi
If you know how to read a file line by line, either by using Scanner or by using BufferedReader then reading a text file into ArrayList is not difficult for you. All you need to do is read each line and store that into ArrayList, as shown in following example:
如果您知道如何通过使用 Scanner 或使用 BufferedReader 逐行读取文件，那么将文本文件读入 ArrayList 对您来说并不困难。您需要做的就是读取每一行并将其存储到 ArrayList 中，如下例所示：
BufferedReader bufReader = new BufferedReader(new
FileReader("file.txt"));
ArrayList<String> listOfLines = new ArrayList<>);
String line = bufReader.readLine(); while (line != null)
{
listOfLines.add(line);
line = bufReader.readLine();
}
bufReader.close();
Just remember to close the BufferedReader once you are done to prevent resource leak, as you don't have try-with-resource statement
请记住在完成后关闭 BufferedReader 以防止资源泄漏，因为您没有 try-with-resource 语句
