Here is a really simple example of how to read a text file using JDK7. The main new feature you will see is the try with resources block on line 10. The program just numbers the lines of a text files up to 9999 lines long.LineNumber.java
1 import java.io.BufferedReader;
2 import java.io.FileNotFoundException;
3 import java.io.FileReader;
4 import java.io.IOException;
5
6 public class LineNumber {
7 public static void main(String[] args){
8 String fileName = args[0];
9
10 try(BufferedReader reader = new BufferedReader(new FileReader(fileName))){
11 String line = ""; int c = 1;
12 while((line = reader.readLine()) != null){
13 System.out.printf("%4d %s\n", c, line);
14 c++;
15 }
16
17 } catch (FileNotFoundException e) {
18 e.printStackTrace();
19 } catch (IOException e){
20 e.printStackTrace();
21 }
22 }
23 }
Text Version of the Source Code
