Java.io.ObjectOutputStream.putFields() 方法



描述

java.io.ObjectOutputStream.putFields() 方法检索用于缓冲要写入流的持久字段的对象。当调用 writeFields 方法时,这些字段将被写入流。

声明

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

public ObjectOutputStream.PutField putFields()

参数

返回值

此方法返回 Putfield 类的实例,该实例保存可序列化的字段。

异常

IOException - 如果发生 I/O 错误。

示例

以下示例显示了 java.io.ObjectOutputStream.putFields() 方法的使用。

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);

         // flush the stream
         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 public class Example implements Serializable {

      private void writeObject(ObjectOutputStream out) throws IOException {

         // write into the ObjectStreamField array the variable string
         ObjectOutputStream.PutField fields = out.putFields();
      }
   }
}

让我们编译并运行以上程序,这将产生以下结果:

319874
1653984
java_io_objectoutputstream.htm
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