Java Java.io.ObjectOutputStream.putFields() 方法

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  描述

  java.io.ObjectOutputStream.putFields()方法检索用于缓冲要写入流中的持久字段的对象。调用writeFields方法时，会将字段写入流中。
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  声明

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

   public ObjectOutputStream.PutField putFields()

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  参数

  不适用
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  返回值

  此方法返回保存可序列化字段的类Putfield的实例。
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  异常

  IOException如果发生I / O错误。
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  例子

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

   
  package com.jc2182;
  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