Java.io.DataOutputStream.writeDouble()方法實例
java.io.DataOuputStream.writeDouble(double v) 方法寫入一個字符序列到流中。
聲明
以下是 java.io.DataOutputStream.writeDouble(double v) 方法的聲明:
public final void writeDouble(double v)
參數
- v -- 一個double值寫入到輸出流。
返回值
This method does not return any value.
異常
- IOException -- 如果發生I/ O錯誤。
例子
下面的例子顯示java.io.DataOutputStream.writeDouble(double v)方法的使用。
package com.yiibai; 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 DataOutputStreamDemo { 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("c:\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("c:\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(); } } }
讓我們編譯和運行上面的程序,這將產生以下結果:
65.56 66.89 67.98 68.82 69.55 70.37