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 ObjectOutputStream
import java.io.*;
public class WriteFieldsOfOOS {
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
// integer to the obj_out_stm stream
obj_out_stm.writeObject(new ReadFields());
obj_out_stm.flush();
// By using readObject() method is to read
// object and display fields
ReadFields 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 var
val = 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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