Java ObjectOutputStream reset()用法及代碼示例

ObjectOutputStream類reset()方法

• reset() 方法可在java.io包。
• reset() 方法用於重置此流。它將流重置到最近標記的位置。
• reset() 方法是一個非靜態方法，它隻能通過類對象訪問，如果我們嘗試使用類名訪問方法，那麽我們將得到一個錯誤。
• reset() 方法可能會在重置流時拋出異常。
  IOException:在寫入輸出流時出現任何輸入/輸出錯誤時，可能會拋出此異常。

用法:

    public void reset();

參數：

• 它不接受任何參數。

返回值：

這個方法的返回類型是void，它什麽都不返回。

例：

// Java program to demonstrate the example 
// of void reset() method of ObjectOutputStream

import java.io.*;

public class ResetOfOOS {
 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 writeByte() method is to
  // write byte to the stream		
  obj_out_stm.writeByte(65);

  // By using reset() method is to
  // reset the stream 
  obj_out_stm.reset();

  // Write another bytes to the
  // stream
  obj_out_stm.writeByte(66);
  obj_out_stm.writeByte(67);

  // By using flush() method is to
  // flush the stream immediately
  System.out.println("Stream Flushed...");
  obj_out_stm.flush();

  // By using readByte() method is to 
  // read the byte and convert it into
  // char
  for (int i = 0; i < 3; ++i) {
   char ch = (char) obj_in_stm.readByte();
   System.out.println("ch:" + ch + " ");
  }

  // By using close() method is to 
  // close all the streams 
  System.out.println("Stream Shutdown... ");

  file_in_stm.close();
  file_out_stm.close();
  obj_in_stm.close();
  obj_out_stm.close();
 }
}

輸出

Stream Flushed...
ch:A 
ch:B 
ch:C 
Stream Shutdown...