Read int from file using DataInputStream

  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. }

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