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Java ObjectInputStream readDouble()用法及代碼示例


ObjectInputStream 的 readDouble() 方法用於讀取 64 位雙精度值。

用法

Public  double  readDouble() throws IOException

參數

沒有傳遞參數。

返回

64 位雙讀。

拋出

EOFException - 如果到達文件末尾。

IOException - 如果發生其他 I/O 錯誤。

例子1

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 ObjectInputStreamreadDoubleExample1  {
   public static void main(String[] args) throws IOException {
      
      byte[] buf = {'j', 'a', 'v', 'a', 'T', 'p', 'o', 'i', 'n', 't'};
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (byte b:buf) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
         while(datainpstream.available()>0) {
         
            // read character
            Double c = datainpstream.readDouble();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
            
         e.printStackTrace();
      } 
   }
}

輸出：

106.0    97.0    118.0    97.0    84.0    112.0    111.0    105.0    110.0    116.0

例子2

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 ObjectInputStreamreadDoubleExample2  {
   public static void main(String[] args) throws IOException {
      
      double[] carray = {21.0, 22.0 , 23.0 , 45.0 , 67.9 , 66.0};
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (double b:carray) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
         for(int i=0;i<=carray.length;i++){ 
         
            // read character
            double c = datainpstream.readDouble();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
        
      } 
   }
}

輸出：

21.0    22.0    23.0    45.0    67.9    66.0




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