Java DataOutputStream writeDouble（）方法与示例

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Java DataOutputStream writeDouble（）方法与示例

2024-07-17 19:43| 来源: 网络整理| 查看: 265

DataOutputStream类writeDouble()方法 (DataOutputStream 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 double value to the basic DataOutputStream.

writeDouble()方法用于将给定的double值写入基本DataOutputStream。

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()方法是一种非静态方法，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。

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

writeDouble()方法在编写double时可能会引发异常。

IOException: This exception may throw while getting any input/output error.

IOException ：在获取任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

public final void writeDouble(double val);

Parameter(s):

参数：

double val – represents the double value to be written to the data output stream.

double val –表示要写入数据输出流的double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 writeDouble(double val) method // of DataOutputStream import java.io.*; public class WriteDoubleOfDOS { public static void main(String[] args) throws Exception { InputStream is_stm = null; DataInputStream dis_stm = null; FileOutputStream fos_stm = null; DataOutputStream dos_stm = null; double[] d = { 10.0, 20.0, 30.0, 40.0, 50.0 }; try { // Instantiate FileInputStream, // DataInputStream, FileOutputStream // and DataOutputStream fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt"); dos_stm = new DataOutputStream(fos_stm); is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt"); dis_stm = new DataInputStream(is_stm); for (double val: d) { // By using writeDouble() method isto // write double value to the // DataOutputStream dos_stm dos_stm.writeDouble(val); } // By using flush() method isto // flush the bytes to the basic // output stream dos_stm.flush(); // Loop To Read Available Data till end while (dis_stm.available() > 0) { // By using readDouble() method isto read // double from dis_stm double val = dis_stm.readDouble(); System.out.println("dos_stm.writeDouble(val): " + val); } } catch (Exception ex) { System.out.println(ex.toString()); } finally { // To free system resources linked // with these streams if (is_stm != null) is_stm.close(); if (dis_stm != null) dis_stm.close(); if (dos_stm != null) dos_stm.close(); if (fos_stm != null) fos_stm.close(); } } }

Output

输出量

dos_stm.writeDouble(val): 10.0 dos_stm.writeDouble(val): 20.0 dos_stm.writeDouble(val): 30.0 dos_stm.writeDouble(val): 40.0 dos_stm.writeDouble(val): 50.0

翻译自: https://www.includehelp.com/java/dataoutputstream-writedouble-method-with-example.aspx

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Java DataOutputStream writeDouble（）方法与示例

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