Java Java.io.ObjectOutputStream.putFields()用法及代码示例

描述

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

声明

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

public ObjectOutputStream.PutField putFields()

参数

NA

返回值

此方法返回保存可序列化字段的 Putfield 类的实例。

异常

IOException- 如果发生了 I/O 错误。

示例

下面的例子展示了使用java.io.ObjectOutputStream.putFields()方法。

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);

         // 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();
      }
   }
}

让我们编译并运行上面的程序，这将产生以下结果——

319874
1653984