如何返回Vector java

Question

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返回函数但我得到错误.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;
    }

Answer 1

您需要将从文件中读取的对象强制转换为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();
        }
     }

请注意,您无法检查它是否真的是一个国家的向量(没有逐个检查内容).