Java.io.DataInputStream.readLong() Method

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Description

The java.io.DataInputStream.readLong() method reads eight input bytes are returns a long value.

Declaration

Following is the declaration for java.io.DataInputStream.readLong() method:

public final long readLong()

Parameters

  • NA

Return Value

This method returns 8 bytes of input stream, interpreted as a long value.

Exception

  • IOException -- -- if an I/O error occurs or the stream is closed.

  • EOFException -- -- if the input stream reaches the end before the method invocation.

Example

The following example shows the usage of java.io.DataInputStream.readLong() method.

package com.tutorialspoint;

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 DataInputStreamDemo {
   public static void main(String[] args) throws IOException {
      
      InputStream is = null;
      DataInputStream dis = null;
      FileOutputStream fos = null;
      DataOutputStream dos = null;
      long[] l = {5488489334534l,234223424334l};
      
      try{
         // create file output stream
         fos = new FileOutputStream("c:\\test.txt");
           
         // create data output stream
         dos = new DataOutputStream(fos);
           
         // for each long in long buffer
         for(long j:l)
         {
            // write long to data output stream
            dos.writeLong(j);
         }
           
         // force data to the underlying file output stream
         dos.flush();
         
         // create file input stream
         is = new FileInputStream("c:\\test.txt");
         
         // create new data input stream
         dis = new DataInputStream(is);
         
         // available stream to be read
         while(dis.available()>0)
         {
            // read four bytes from data input, return int
            long k = dis.readLong();
            
            // print long value
            System.out.print(k+" ");
         }
      }catch(Exception e){
         // if any error occurs
         e.printStackTrace();
      }finally{
         
         // releases all system resources from the streams
         if(is!=null)
            is.close();
         if(dis!=null)
            dis.close();
         if(fos!=null)
            fos.close();
         if(dos!=null)
            dos.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

5488489334534 234223424334 



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