import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.FileWriter;public class TxtFile { public void read() { FileReader fr = null; BufferedReader br = null; try { fr = new FileReader("F://a.txt"); br = new BufferedReader(fr); String line = br.readLine(); while (line != null) { System.out.println(line); line = br.readLine(); } } catch (Exception e) { System.out.println(e); } finally { try { if (br != null) br.close(); if (fr != null) fr.close();// 关闭文件 } catch (Exception e) { System.out.println(e); } } } public void write() { File file = null; FileWriter fw = null; try { file = new File("F://a.txt"); fw = new FileWriter(file); for (int i = 0; i < 20; i++) { fw.append("第" + i + 1 + "次"); } } catch (Exception e) { System.out.println(e); } finally { try { if (fw != null) fw.close();// 关闭文件 } catch (Exception e) { System.out.println(e); } } }}