Java Java.io.ObjectInputStream.defaultReadObject() 方法

描述

java.io.ObjectInputStream.defaultReadObject()方法用于从这个ObjectInputStream读取当前类的非静态和非瞬态字段，它间接地涉及到该类的readObject()方法的帮助。

声明

以下是java.io.ObjectInputStream.defaultReadObject()方法的声明。

 public void defaultReadObject()

参数

不适用

返回值

此方法不返回值。

异常

IOException如果发生I / O错误。

例子

以下示例显示java.io.ObjectInputStream.close()方法的用法。

 
package com.jc2182; 
import java.io.*; 
 
public class DefaultReadObject {
 public static void main(String[] args) throws Exception {
  // Instantiates ObjectOutputStream , ObjectInputStream 
  // FileInputStream and FileOutputStream
  FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
  ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
  FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
  ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);
 
  // By using writeObject() method is to
  // write object to Serialized class
  obj_out_stm.writeObject(new DefaultObjectClass());
  obj_out_stm.flush();
 
  // By using readObject() method is to
  // read an object from the Serialized class
  DefaultObjectClass def_obj = (DefaultObjectClass) obj_in_stm.readObject();
 
  // Using both readObject and defaultReadObject(); 
  System.out.println("obj_in_stm.defaultReadObject(): " + def_obj.str);
  System.out.println("obj_in_stm.defaultReadObject(): " + def_obj.in);
 }
 
 static class DefaultObjectClass implements Serializable {
  String str = "Java Programming";
  Integer in = new Integer(10);
  private void readObject(ObjectInputStream obj_stm) throws IOException, ClassNotFoundException {
   // By using defaultReadObject() method is 
   // to read non-static fields of the present 
   // class from the ObjectInputStream
   obj_stm.defaultReadObject();
  }
 }
}

让我们编译并运行以上程序，这将产生以下结果-

 
obj_in_stm.defaultReadObject(): Java Programming
obj_in_stm.defaultReadObject(): 10