Java ObjectOutputStream writeInt()用法及代碼示例

ObjectOutputStream類writeInt()方法

• writeInt() 方法可在java.io包。
• writeInt() 方法用於寫入整數值的給定 4 個字節。
• writeInt() 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。
• writeInt() 方法可能在寫入整數時拋出異常。
  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 writeInt(int value);

參數：

• int value– 表示要寫入的整數值。

返回值：

該方法的返回類型是void，它什麽都不返回。

例：

// Java program to demonstrate the example 
// of void writeInt(int value) method of 
// ObjectOutputStream

import java.io.*;

public class WriteIntOfOOS {
 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 writeInt() method is to
  // write the int to the stream		
  obj_out_stm.writeInt(100);
  obj_out_stm.writeInt(200);
  obj_out_stm.writeInt(300);
  obj_out_stm.writeInt(400);

  obj_out_stm.flush();

  // By using readInt() method is to 
  // read the int
  for (int i = 0; i < 4; ++i) {
   int in = obj_in_stm.readInt();
   System.out.println("obj_in_stm.readInt():" + in );
  }

  // 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

obj_in_stm.readInt():100
obj_in_stm.readInt():200
obj_in_stm.readInt():300
obj_in_stm.readInt():400
Stream Shutdown...