Java DataOutputStream writeDouble()方法

java.io.DataOuputStream.writeDouble(double v) 用于向输出流写入一个double。

1 语法

public final void writeDouble(double v)

2 参数

v：要写入输出流的double值。

3 返回值

无

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.DataOuputStream.writeDouble(double v)方法的例子
 */
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Demo {
    public static void main(String[] args) throws IOException {
        InputStream is = null;
        DataInputStream dis = null;
        FileOutputStream fos = null;
        DataOutputStream dos = null;
        double[] dbuf = {65.56,66.89,67.98,68.82,69.55,70.37};

        try {
            // create file output stream
            fos = new FileOutputStream("d:\\test.txt");

            // create data output stream
            dos = new DataOutputStream(fos);

            // for each byte in the buffer
            for (double d:dbuf) {

                // write double to the data output stream
                dos.writeDouble(d);
            }

            // force bytes to the underlying stream
            dos.flush();

            // create file input stream
            is = new FileInputStream("d:\\test.txt");

            // create new data input stream
            dis = new DataInputStream(is);

            // read till end of the stream
            while(dis.available()>0) {

                // read character
                double c = dis.readDouble();

                // print
                System.out.print(c + " ");
            }

        } catch(Exception e) {
            // if an I/O error occurs
            e.printStackTrace();
        } finally {
            // releases all system resources from the streams
            if(is!=null)
                is.close();
            if(dos!=null)
                is.close();
            if(dis!=null)
                dis.close();
            if(fos!=null)
                fos.close();
        }
    }
}

输出结果为：

65.56 66.89 67.98 68.82 69.55 70.37