Java学习之IO流（转换流）

 1 private static void readKey3() throws IOException {
 2     // 字节流
 3     InputStream in = System.in;
 4 
 5     // 字节流转成字符流。解码
 6     Reader r = new InputStreamReader(in);
 7     // 字符流
 8     BufferedReader br = new BufferedReader(r);
 9 
10     // 字节流
11     OutputStream out = System.out;
12     // 字符流转成字节流。编码
13     Writer w = new OutputStreamWriter(out);
14     // 字符流
15     BufferedWriter bw = new BufferedWriter(w);
16     String line = null;
17     while ((line = br.readLine()) != null) {
18         if ("over".equals(line)) {
19         break;
20         }
21         //System.out.println(line.toUpperCase());
22         //接收字符
23         bw.write(line.toUpperCase());
24         bw.newLine();
25         bw.flush();
26     }
27     }