java面向对象第八章

选择题 1.A 2.A 3.B 4.C 5.C

简答题 1.字节流：输入流InputStream和字节输出流OutputStream。 字符流：字符输入流Reader和字符输出流Writer。

2.FileNotFoundException和IOException

public class ReaderAndWriterFile { public static void main(String[] args) { BufferedReader reader=null; BufferedWriter writer=null; try { reader = new BufferedReader(fr); writer = new BufferedWriter(fw); String line = null; StringBuffer sbf=new StringBuffer(); while ((line = reader.readLine()) != null) { sbf.append(line); } writer.write(sbf.toString()); } catch (FileNotFoundException e) { System.out.println("无此文件"); }catch (IOException e) { e.printStackTrace(); }finally{ try { if(reader!=null) reader.close(); if(writer!=null) writer.close(); }catch (IOException e) { e.printStackTrace(); } } } } public class ReadIinFile { public static void main(String[] args) { FileInputStream fis = null; DataInputStream dis = null; try { fis = new FileInputStream("C:\\Windows\\win.ini"); dis = new DataInputStream(fis); int temp; while ( (temp = dis.read()) != -1) { System.out.print((char)temp); } }catch (FileNotFoundException e) { System.out.println("无此文件"); }catch (IOException ioe) { ioe.printStackTrace(); }finally{ try { if(fis!=null) fis.close(); } catch (IOException e) { e.printStackTrace(); } } } }

练习

public class InputAndOutputFile { public static void main(String[] args) { FileInputStream fis=null; FileOutputStream fos=null; try { fis = new FileInputStream("D:/我的青春谁做主.txt"); fos = new FileOutputStream("C:/myFile/myPrime.txt",true); byte[] words=new byte[1024]; while((fis.read())!=-1){ fis.read(words); fos.write(words, 0, words.length); } System.out.println("复制完成，请查看文件！"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ try { if(fos!=null) fos.close(); if(fis!=null) fis.close(); } catch (IOException e) { e.printStackTrace(); } } } }

练习·

public class ReaderAndWriterFile { public void replaceFile(String file1,String file2) { BufferedReader reader = null; BufferedWriter writer = null; try { FileReader fr = new FileReader(file1); FileWriter fw = new FileWriter(file2); reader = new BufferedReader(fr); writer = new BufferedWriter(fw); String line = null; StringBuffer sbf=new StringBuffer(); while ((line = reader.readLine()) != null) { sbf.append(line); } System.out.println("替换前："+sbf); String newString=sbf.toString().replace("{name}", "欧欧"); newString = newString.replace("{type}", "狗狗"); newString = newString.replace("{master}", "李伟"); System.out.println("替换后："+newString); writer.write(newString); } catch (IOException e) { e.printStackTrace(); }finally{ try { if(reader!=null) reader.close(); if(writer!=null) writer.close(); } catch (IOException e) { e.printStackTrace(); } } } public static void main(String[] args) { ReaderAndWriterFile obj = new ReaderAndWriterFile(); }