ObjectOutputStream putFields()方法

java.io.ObjectOutputStream.putFields() 此方法检索用于缓冲持久性字段被写入流的对象。调用writeFields方法时，会将字段写入流中。

1 语法

public ObjectOutputStream.PutField putFields()

2 参数

无

3 返回值

返回保存可序列化字段的类PutField的实例。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.ObjectOutputStream.putFields()方法的例子
 */
import java.io.*;

public class Demo {
    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();
        }
    }
}

输出结果为：

319874
1653984