ObjectOutputStream類writeDouble()方法 (ObjectOutputStream Class writeDouble() method)

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

  java.io包中提供了writeDouble()方法 。

• writeDouble() method is used to write the given 8 bytes (i.e. 64 bit) double value.

  writeDouble()方法用于寫入給定的8字節(jié)(即64位)雙精度值。

• writeDouble() 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.

  writeDouble()方法是一種非靜態(tài)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。

• writeDouble() method may throw an exception at the time of writing double.

  writeDouble()方法在編寫double時可能會引發(fā)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(fā)此異常。

Syntax:

句法：

public void writeDouble(double value);

Parameter(s):

參數(shù)：

• double value – represents the double value to be written.

  double value –表示要寫入的double值。

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(nèi)容。

Example:

例：

// Java program to demonstrate the example // of void writeDouble(double value) // method of ObjectOutputStreamimport java.io.*;public class WriteDoubleOfOOS {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 writeDouble() method is to// write the double to the stream obj_out_stm.writeDouble(10.0);obj_out_stm.writeDouble(20.0);obj_out_stm.writeDouble(30.0);obj_out_stm.writeDouble(40.0);obj_out_stm.flush();// By using readDouble() method is to // read the double for (int i = 0; i < 4; ++i) {double d = obj_in_stm.readDouble();System.out.println("obj_in_stm.readDouble(): " + d);}// 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

輸出量

obj_in_stm.readDouble(): 10.0 obj_in_stm.readDouble(): 20.0 obj_in_stm.readDouble(): 30.0 obj_in_stm.readDouble(): 40.0 Stream Shutdown...

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

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