ObjectOutputStream類writeFields()方法 (ObjectOutputStream Class writeFields() method)

• writeFields() method is available in java.io package.

  在java.io包中提供了writeFields()方法 。

• writeFields() method is used to write the buffered fields to the ObjectOutputStream.

  writeFields()方法用于將緩沖的字段寫入ObjectOutputStream。

• writeFields() 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.

  writeFields()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• writeFields() method may throw an exception at the time of writing fields.

  writeFields()方法在寫入字段時可能會引發異常。

  • IOException: This exception may throw when getting any input/output error while writing to the output stream.IOException ：在寫入輸出流時遇到任何輸入/輸出錯誤時，可能引發此異常。
  • NotActiveException: This exception may throw when writeObject() was not invoked to write the state of the object of classes.NotActiveException ：如果未調用writeObject()來寫入類對象的狀態，則可能引發此異常。

Syntax:

句法：

public void writeFields();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

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

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void writeFields() method of ObjectOutputStreamimport java.io.*;public class WriteFieldsOfOOS {public static void main(String[] args) throws Exception {// Instantiates ObjectOutputStream , ObjectInputStream // FileInputStream and FileOutputStreamFileOutputStream 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// integer to the obj_out_stm streamobj_out_stm.writeObject(new ReadFields());obj_out_stm.flush();// By using readObject() method is to read// object and display fieldsReadFields rf = (ReadFields) obj_in_stm.readObject();System.out.println("obj_in_stm.writeFields(): " + rf.val);}static public class ReadFields implements Serializable {static int val = 12685;private static final ObjectStreamField[] serialPersistentFields = {new ObjectStreamField("val", Integer.TYPE)};private void readObject(ObjectInputStream oin)throws IOException, ClassNotFoundException {// Invokes readFields()ObjectInputStream.GetField fi = oin.readFields();// By using get() is to get varval = fi.get("val", 0);}private void writeObject(ObjectOutputStream oos) throws IOException {// By using putFields() method is to// write var into ObjectStreamField[]ObjectOutputStream.PutField fi = oos.putFields();fi.put("val", val);// Invokes writeFields()oos.writeFields();}} }

Output

輸出量

obj_in_stm.writeFields(): 12685

翻譯自: https://www.includehelp.com/java/objectoutputstream-writefields-method-with-example.aspx

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