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Read a textfile into an ArrayList

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PLAIN TEXT
JAVA:
  1. /*--------------------------------------------------------------------------
  2. ScanToArrayDemo class
  3. *****************
  4. By: HappyFace   http://www.engineeringserver.com
  5. Contact:        info [@] engineeringserver.com
  6. Version:        10/September/2008
  7. "*****************
  8. Note: Read a textfile into an ArrayList
  9. //----------------------------------------------------------------------*/
  10. import java.io.File;
  11. import java.io.FileNotFoundException;
  12. import java.io.IOException;
  13. import java.util.ArrayList;
  14. import java.util.Scanner;
  15.  
  16. public class ScanToArrayDemo {
  17. public static void main(String[] args){
  18. File fInput     = new File("c:\\input.txt");
  19. ArrayList textHolder = new ArrayList();
  20. String tmp = "";
  21. try {
  22. Scanner scInput = new Scanner(fInput);
  23. while (scInput.hasNextLine()){
  24. tmp = scInput.nextLine();
  25. textHolder.add(tmp);
  26. }
  27. }
  29. e.printStackTrace();
  30. }
  31. catch (IOException e) {
  32. e.printStackTrace();
  33. }
  34. //display the content of the array
  35. System.out.println(textHolder.get(3));
  36. }
  37. }


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September 10th, 2008 in Java |

How to read a textfile and output it , BufferedReader & Scanner

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Here's a demo I wrote some time ago to read a file and output it in the console. I've created 2 versions. One that uses the "Scanner object" and the other the "BufferedReader object" to read the text files from disk.

Both examples of mine work, but the Scanner version is preferred.

BufferedReader version:

PLAIN TEXT
JAVA:
  1. public class ReadFile {
  2. public static void main(String[] args) {
  3. ReadFile rf = new ReadFile();
  4. rf.readFile();
  5. }
  6. public void readFile(){
  7. try {
  8. FileReader fr = new FileReader("c:\\input.txt"); // read a file
  10. String tmp;
  11. tmp = br.readLine(); // read first line of file.
  12. while(tmp != null){ // read a line until end of file.
  13. System.out.println("" + tmp);
  14. tmp = br.readLine();
  15. }
  16. br.close();
  17. } catch (FileNotFoundException e) {
  18. e.printStackTrace();
  19. } catch (IOException e) {
  20. e.printStackTrace();
  21. }
  22. }
  23. }


Scanner version:

PLAIN TEXT
JAVA:
  1. public class ReadLineDemo {
  2. public static void main(String[] args){
  3. ReadLineDemo EDS = new ReadLineDemo();
  4. EDS.readFile();
  5. }
  6. public void readFile(){
  7. String str;
  9. try {
  10. fr = new FileReader("c:\\input.txt");
  11. System.out.println("begin");
  12. Scanner sc = new Scanner(fr);
  13. while(sc.hasNext()){
  14. str = sc.nextLine();
  15. System.out.println(str);
  16. }
  17. }
  19. e.printStackTrace();
  20. }
  21. }
  22. }


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April 14th, 2008 in Java |