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Read int from file using DataInputStream

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  1. /*
  2.   Read int from file using DataInputStream
  3.   This Java example shows how to read a Java integer primitive value from file using
  4.   readInt method of Java DataInputStream class.
  5. */
  6.  
  7. import java.io.DataInputStream;
  8. import java.io.FileInputStream;
  9. import java.io.FileNotFoundException;
  10. import java.io.IOException;
  11.  
  12. public class ReadIntFromFile {
  13.  
  14.   public static void main(String[] args) {
  15.  
  16.     String strFilePath = "C://FileIO//readInt.txt";
  17.    
  18.     try
  19.     {
  20.       //create FileInputStream object
  21.       FileInputStream fin = new FileInputStream(strFilePath);
  22.      
  23.       /*
  24.        * To create DataInputStream object, use
  25.        * DataInputStream(InputStream in) constructor.
  26.        */
  27.      
  28.        DataInputStream din = new DataInputStream(fin);
  29.      
  30.        /*
  31.         * To read a Java integer primitive from file, use
  32.         * byte readInt() method of Java DataInputStream class.
  33.         *
  34.         * This method reads 4 bytes and returns it as a int value.
  35.         */
  36.        
  37.         int i = din.readInt();
  38.        
  39.         System.out.println("int : " + i);
  40.        
  41.         /*
  42.          * To close DataInputStream, use
  43.          * void close() method.
  44.          */
  45.          din.close();
  46.        
  47.     }
  48.     catch(FileNotFoundException fe)
  49.     {
  50.       System.out.println("FileNotFoundException : " + fe);
  51.     }
  52.     catch(IOException ioe)
  53.     {
  54.       System.out.println("IOException : " + ioe);
  55.     }
  56.   }
  57. }