Java ObjectOutputStream writeLong（）方法与示例

参考链接： Java ObjectOutputStream类

ObjectOutputStream类writeLong()方法 (ObjectOutputStream Class writeLong() method) 

 writeLong() method is available in java.io package. writeLong()方法在java.io包中可用。 writeLong() method is used to write the given 8 bytes long value. writeLong()方法用于写入给定的8个字节长的值。 writeLong() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error. writeLong()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。 writeLong() method may throw an exception at the time of writing long. writeLong()方法在写入很长时间时可能会引发异常。  IOException: This exception may throw when getting any input/output error while writing to the output stream. IOException ：在写入输出流时遇到任何输入/输出错误时，可能引发此异常。  

 Syntax: 

  句法：  

     public void writeLong(long value);

 Parameter(s): 

  参数：  

 long value – represents the long value to be written. long value –表示要写入的long值。 

 Return value: 

  返回值：  

 The return type of the method is void, it returns nothing. 

  该方法的返回类型为void ，不返回任何内容。  

 Example: 

  例：  

 // Java program to demonstrate the example 

// of void writeLong(long value) method of 

// ObjectOutputStream

import java.io.*;

public class WriteLongOfOOS {

 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 writeLong() method is to

  // write the long to the stream        

  obj_out_stm.writeLong(5411489332534l);

  obj_out_stm.writeLong(234773224114l);

  obj_out_stm.flush();

  // By using readLong() method is to 

  // read the long and convert it into long

  for (int i = 0; i < 2; ++i) {

   long l = (long) obj_in_stm.readLong();

   System.out.println("obj_in_stm.readLong(): " + l);

  }

  // 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();

 }

}

 Output 

  输出量  

 obj_in_stm.readLong(): 5411489332534

obj_in_stm.readLong(): 234773224114

Stream Shutdown...

  翻译自: https://www.includehelp.com/java/objectoutputstream-writelong-method-with-example.aspx