下面的代码是读取文本文件的例子，程序会读取text.txt文件，并将它的内容显示出来。
1 import java.io.BufferedReader;
2 import java.io.File;
3 import java.io.FileReader;
4 import java.io.FileNotFoundException;
5 import java.io.IOException;
6
7 public class ReadTextFileExample
8 {
9 public static void main(String[] args)
10 {
11 File file = new File("test.txt");
12 StringBuffer contents = new StringBuffer();
13 BufferedReader reader = null;
14
15 try
16 {
17 reader = new BufferedReader(new FileReader(file));
18 String text = null;
19
20 // repeat until all lines is read
21 while ((text = reader.readLine()) != null)
22 {
23 contents.append(text)
24 .append(System.getProperty(
25 "line.separator"));
26 }