Java语言读取文件以后再打开字典，字典的内容怎么保持和文件相同的顺序并且允许第一列重复
用LinkedHashMap来实现。
LinkedHashMap是Java中的一个具体实现类，它继承自HashMap，但还维护了一个双向链表来保持插入顺序。这使得它能够按照插入的顺序迭代元素，从而保持和文件中的顺序相同。
下面是一个示例代码，演示了如何读取文件、打开字典并保持顺序与文件相同的逻辑：
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;
public class FileToDictionary {
public static void main(String[] args) {
String filePath = "path/to/your/file.txt"; // 文件路径
try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
Map<String, String> dictionary = new LinkedHashMap<>();
String line;
while ((line = reader.readLine()) != null) {
// 解析每一行为字典条目
// 假设每行以制表符或空格分隔键值对，可以根据实际情况进行修改
String[] parts = line.split("\\s+", 2);
if (parts.length == 2) {
String key = parts[0].trim();
String value = parts[1].trim();
dictionary.put(key, value);
}
}
// 打印字典内容，按照文件顺序
for (Map.Entry<String, String> entry : dictionary.entrySet()) {
System.out.println(entry.getKey() + " -> " + entry.getValue());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
在上述示例代码中，用LinkedHashMap来存储字典条目，并在每次读取文件行时将键值对添加到dictionary中。然后用entrySet()方法按顺序迭代dictionary的条目，并打印出键和值。
，示例代码假设每行以制表符或空格分隔键值对，你可以根据实际情况修改该分隔符。同时，如果文件中的键（第一列）可以重复，使用LinkedHashMap将保留最后一次出现的键值对，因为后续的条目会覆盖先前的条目。如果你希望保留第一次出现的键值对，可以将示例代码中的LinkedHashMap替换为ArrayList或LinkedList，并在每次读取到的条目后追加到列表中。
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