void defaultWriteObject


描述

所述java.io.ObjectOutputStream.defaultWriteObject()方法将当前类的非静态和非瞬态字段此流。这可能只能从被序列化的类的writeObject方法调用。如果以其他方式调用它,它将抛出NotActiveException。

声明

以下是java.io.ObjectOutputStream.defaultWriteObject()方法的声明。

public void defaultWriteObject()

参数

NA

返回值

此方法不返回值。

异常

IOException - 如果在写入底层OutputStream时发生I / O错误。

实例

以下示例显示了java.io.ObjectOutputStream.defaultWriteObject()方法的用法。

package com.tutorialspoint;

import java.io.*;

public class ObjectOutputStreamDemo {
   public static void main(String[] args) {
      int i = 319874;

      try {
         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeInt(i);
         oout.writeInt(1653984);
         oout.flush();

         // close the stream
         oout.close();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

         // read and print an int
         System.out.println("" + ois.readInt());

         // read and print an int
         System.out.println("" + ois.readInt());

      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }

   static class Example implements Serializable {
      String s = "Hello World!";

      private void writeObject(ObjectOutputStream out)
         throws IOException, ClassNotFoundException {
         out.defaultWriteObject();
      }
   }
}

让我们编译并运行上面的程序,这将产生以下结果

319874
1653984