java - 从 ArrayList 写入文件

Question

我正在尝试将 ArrayList 写入 java 中的文件。这就是我在主课中所做的:

要将字符串写入 ArrayList，我这样做:

list.add(String);

然后，将其写入文件:

readWrite.writing(list);

列表为:List<String> list = new ArrayList<String>();

readWrite引用此类，我在其中定义了读/写文件的方法:

 public void writing(ArrayList listToWrite) throws IOException {
    fileOutPutStream = new FileOutputStream (file);
    write = new ObjectOutputStream (fileOutPutStream);
    for (int i=0; i<=listToWrite.size(); i++){
        write.writeObject(listToWrite.get(i));
    }
    write.close();
}

在控制台上尝试时，我收到此异常:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
    at java.util.ArrayList.rangeCheck(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at //*I GET REFERENCED TO THIS LINE IN THE CODE ABOVE:* **write.writeObject(listToWrite.get(i));**

Answer 1

小心你的限制:使用 <=您将一项移至列表末尾。

for (int i=0; i<listToWrite.size(); i++){

再次注意 ArrayList本身是可序列化的。您可以将其写入文件而不循环:

write = new ObjectOutputStream(fileOutPutStream);
write.writeObject(listToWrite);
write.close();