我如何返回一个 Vector java
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How do I return a Vector java
提问by Hultner
How do I return a vector in a java function. I want to unserialize a vector loaded from a file and return in a function but I get errors. This is what code I currently have.
如何在 java 函数中返回一个向量。我想对从文件加载的向量进行反序列化并在函数中返回，但出现错误。这是我目前拥有的代码。
private static Vector<Countries> loadOB(String sFname) throws ClassNotFoundException, IOException {
ObjectInputStream oStream = new ObjectInputStream(new FileInputStream(sFname));
Object object = oStream.readObject();
oStream.close();
return object;
}
回答by Thilo
You need to cast the object that you read from the file to Vector:
您需要将从文件中读取的对象转换为 Vector：
private static Vector<Countries> loadOB(String sFname) throws ClassNotFoundException, IOException {
ObjectInputStream oStream = new ObjectInputStream(new FileInputStream(sFname));
try{
Object object = oStream.readObject();
if (object instanceof Vector)
return (Vector<Countries>) object;
throw new IllegalArgumentException("not a Vector in "+sFname);
}finally{
oStream.close();
}
}
Note that you cannot check if it is really a Vector of Countries (short of checking the contents one by one).
请注意，您无法检查它是否真的是一个国家矢量（无法一一检查内容）。
回答by polygenelubricants
This is a wild guess, but try return (Vector<Countries>) object;
这是一个疯狂的猜测，但请尝试 return (Vector<Countries>) object;
