静态Final Long serialVersionUID = 1L [英] Static Final Long serialVersionUID = 1L
问题描述
可能重复：
什么是serialVersionUID以及我为什么要使用它？
servlet中的含义是什么（private static final serialVersionUID = 1L）？
我有一个关于我们教授给出的指导计划的简单问题。
我已经多次看过serialVersionUID了，但我不知道那是为了什么。
I have 1 simple question about this guided program given by our professor. I have seen serialVersionUID several times but I dont what's that for.
package module;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author JA
*/
public class Servlet_1 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet{
static final long serialVersionUID = 1L;
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("txt/html");
ServletOutputStream out = response.getOutputStream();
out.println("<html>");
out.println("<head><title>Hello Panget</title></head>");
out.println("<body>");
out.println("<h1>Hello Panget</h1>");
out.println("</body></html>");
}
protected void doPost (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Write your program here, Panget.
}
}
有什么用？程序中的静态final final serialVersionUID = 1L; ？
推荐答案
serialVersionUID 是 Serializable 类的通用版本标识符。反序列化使用此数字来确保加载的类与序列化对象完全对应。如果未找到匹配项，则抛出 InvalidClassException 。
The serialVersionUID is a universal version identifier for a Serializable class. Deserialization uses this number to ensure that a loaded class corresponds exactly to a serialized object. If no match is found, then an InvalidClassException is thrown.
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