Java ObjectInputStream readInt() Method

The readInt() method of ObjectInputStream class is used to read a 32-bit int.

Syntax

Parameter

No parameter is passed.

Returns

the 32-bit integer 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 ObjectInputStreamreadIntExample1  {
   public static void main(String[] args) throws IOException {
      
      int[] 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 (int b:buf) {
            // write character to the dos
            dataoutstream.writeInt(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
            int c = datainpstream.readInt();
            
            // 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 ObjectInputStreamreadIntExample2 {
   public static void main(String[] args) throws IOException {
      
      int[] carray = {21 ,  22 , 23 , 45 , 67 , 66};
      int barray[];
      
      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 (int b:carray) {
            // write character to the dos
            dataoutstream.writeInt(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
            int c = datainpstream.readInt();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
        
      } 
   }
}

Output: