如何返回 Vector java

发布于 2024-08-24 21:38:12 字数 388 浏览 4 评论 0原文

如何在 java 函数中返回向量。我想反序列化从文件加载的向量并在函数中返回，但出现错误。这就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;
    }

原文

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.

    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;
    }

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走过海棠暮 2024-08-31 21:38:12

您需要将从文件中读取的对象转换为向量：

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();
        }
     }

请注意，您无法检查它是否真的是国家向量（无法一一检查内容）。

You need to cast the object that you read from the file to 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).

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