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Java ObjectInputStream readLong()用法及代码示例


ObjectInputStream 类的 readLong() 方法用于读取 64 位浮点数。

用法

public  long readLong()throws IOException

参数

没有传递参数。

返回

64 位长读。

抛出

EOFException - 如果到达文件末尾。

IOException - 如果发生其他 I/O 错误。

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 ObjectInputStreamreadLongExample1  {
   public static void main(String[] args) throws IOException {
      
      long[] buf = {1 , 2 , 6 , 6 , 7 , 3};
      
      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 (long b:buf) {
            // write character to the dos
            dataoutstream.writeLong(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
            long c = datainpstream.readLong();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
            
         e.printStackTrace();
      } 
   }
}

输出：

1    2    6    6    7    3

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 ObjectInputStreamreadLongExample2 {
   public static void main(String[] args) throws IOException {
      
      int[] carray = {21 ,  22 , 23 , 45 , 67 , 66};
     
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("barray");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (long b:carray) {
            // write character to the dos
            dataoutstream.writeLong(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("barray");
         
         // 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 double values in float format
            long c = datainpstream.readLong();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
        
      } 
   }
}

输出：

21    22    23    45    67    66




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注：本文由纯净天空筛选整理自 Java ObjectInputStream readLong() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。