1:  import java.io.*;

   2:  public class TestTransForm1 {

   3:    public static void main(String[] args) {

   4:      try {

   5:        

OutputStreamWriter

 osw = new OutputStreamWriter(

   6:             new 

FileOutputStream

("d:\\bak\\char.txt"));

   7:        osw.write("mircosoftibmsunapplehp");

   8:        System.out.println(osw.getEncoding());

   9:        osw.close();

  10:        osw = new OutputStreamWriter(new FileOutputStream("d:\\bak\\char.txt", true),

  11:                                        "ISO8859_1"); // latin-1

  12:            //true 表示文件末尾追加                            

  13:        osw.write("mircosoftibmsunapplehp");

  14:        System.out.println(osw.getEncoding());

  15:        osw.close();

  16:      } catch (IOException e) {

  17:        e.printStackTrace();

  18:      }

  19:    }

  20:  }

   1:  import java.io.*;

   2:  public class TestTransForm2 {

   3:    public static void main(String args[]) {

   4:      InputStreamReader isr = 

5: new InputStreamReader(System.in);

//in是系统的标准输入流，是InputStream的一个子类 ，从DOS窗口输入

   6:      BufferedReader br = new BufferedReader(isr);  

       //为何又包了一层？因为BufferedReader有个很好用的方法readline()

   7:      String s = null;

   8:      try {

   9:        s = br.readLine();

  10:        while(s!=null){

  11:          if(s.equalsIgnoreCase("exit")) break;

  12:          System.out.println(s.toUpperCase());

  13:          

s = br.readLine();

  14:        }

  15:        br.close();

  16:      } catch (IOException e) {

  17:        e.printStackTrace();

  18:      }

  19:    }

  20:  } //阻塞，不输入就不能干别的

   1:  import java.io.*;

   2:  public class TestDataStream {

   3:    public static void main(String[] args) {

   4:      

ByteArrayOutputStream baos =

   5:                          

new ByteArrayOutputStream();

  //new出一个“管道”的时候，同时自动建一个字节数组

   6:      

DataOutputStream dos =

   7:                          

new DataOutputStream(baos);

   //DataOutputStream好处是可以直接输出基本数据类型

   8:      try {

   9:        

dos.writeDouble(Math.random()); //写入一个8byte的数

  10:        

dos.writeBoolean(true); //写入一个1byte的boolean

  11:        ByteArrayInputStream bais = 

  12:            new ByteArrayInputStream(

baos.toByteArray

());

  13:        System.out.println(

bais.available()

);

  14:        DataInputStream dis = new DataInputStream(bais);

  15:        System.out.println(

dis.readDouble

());      先写先读，所以要先readdouble，再readboolean

  16:        System.out.println(

dis.readBoolean

());

  17:        dos.close();  dis.close();

  18:      } catch (IOException e) {

  19:        e.printStackTrace();

  20:      }

  21:    }

  22:  }