java 创建一个由 .txt 元素填充的数组
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Create an Array populating it by .txt elements
提问by Franky
I want to create an array, populating it while reading elements from a .txt file formatted like so:
我想创建一个数组，在从格式如下的 .txt 文件中读取元素时填充它：
item1
item2
item3
So the final result has to be an array like this:
所以最终结果必须是这样的数组：
String[] myArray = {item1, item2, item3}
Thanks in advance.
提前致谢。
采纳答案by Jo?o Silva
- Wrap a
BufferedReaderaround aFileReaderso that you can easily read every line of the file; - Store the lines in a
List(assuming you don't know how many lines you are going to read); - Convert the
Listto an array usingtoArray.
- 将 a 包裹
BufferedReader起来，FileReader以便您可以轻松读取文件的每一行； - 将行存储在 a 中
List（假设您不知道要阅读多少行）； - 使用 将 转换
List为数组toArray。
Simple implementation:
简单的实现：
public static void main(String[] args) throws IOException {
List<String> lines = new ArrayList<String>();
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader("file.txt"));
String line = null;
while ((line = reader.readLine()) != null) {
lines.add(line);
}
} finally {
reader.close();
}
String[] array = lines.toArray();
}
回答by corsiKa
This smells like homework. If it is you should re-read your notes, and tell us what you've tried.
这闻起来像家庭作业。如果是，您应该重新阅读您的笔记，并告诉我们您的尝试。
Personally, I would use a Scanner (from java.util).
就个人而言，我会使用扫描仪（来自 java.util）。
import java.io.*;
import java.util.*;
public class Franky {
public static void main(String[] args) {
Scanner sc = new Scanner(new File("myfile.txt"));
String[] items = new String[3]; // use ArrayList if you don't know how many
int i = 0;
while(sc.hasNextLine() && i < items.length) {
items[i] = sc.nextLine();
i++;
}
}
}
