ObjectOutputStream drain()方法

java.io.ObjectOutputStream.drain() 此方法用于清除ObjectOutputStream中所有缓冲的数据。与flush()方法类似，但不会将刷新传播到基础流。

1 语法

protected void drain()

2 参数

无

3 返回值

无

4 示例 

package com.yiidian;

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

public class Demo extends ObjectOutputStream{

    public Demo(OutputStream out) throws IOException {
        super(out);
    }

    public static void main(String[] args) {
        int i = 319874;

        try {
            // create a new file with an ObjectOutputStream
            FileOutputStream out = new FileOutputStream("test.txt");
            Demo oout = new Demo(out);

            // write something in the file
            oout.writeInt(i);
            oout.writeInt(1653984);

            // drain the stream
            oout.drain();

            // 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();
        }
    }
}

输出结果为：

Number = 15
Number = 20
Number = 25