java.io.ObjectOutputStream.drain() 方法可以釋放ObjectOutputStream的任何緩衝的數據。類似衝洗，但不會傳播刷新到基礎流。

聲明

以下是java.io.ObjectOutputStream.drain()方法的聲明

protected void drain()

參數

• NA

返回值

這個方法冇有返回值

異常

• IOException -- 如果在寫入底層流發生I / O錯誤

例子

下麵的示例演示java.io.ObjectOutputStream.drain()方法的用法。

package com.yiibai;

import java.io.*;

public class ObjectOutputStreamDemo extends ObjectOutputStream{

   public ObjectOutputStreamDemo(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");
         ObjectOutputStreamDemo oout = new ObjectOutputStreamDemo(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();
      }

   }
}

讓我們編譯和運行上麵的程序，這將產生以下結果：

319874
1653984