Java ObjectInputStream readLong() Method with Examples

by Online Tutorials Library July 22, 2022

Java ObjectInputStream readLong() Method

The readLong() method of ObjectInputStream class is used to read a 64 bit float.

Syntax

Parameter

No parameter is passed.

Returns

the 64-bit Long read.

Throws

EOFException – If the end of file is reached.

IOException – If other I/O error has occurred.

Example 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();        }      }  }  

Output:

1    2    6    6    7    3

Example 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) {                  }      }  }  

Output:

21    22    23    45    67    66

Next TopicJava ObjectInputStream

available()close()defaultReadObject()java objectinputstream read()readBoolean()readChar()readClassDescriptor()readFloat()readLong()readshort()