标准键盘录入，System.in
InputStream is=System.in;
InputStreamReader isr=new InputStream(is);
BufferedReader br=new BufferedReader(isr);
String line =br.readLine();
输出。
OutputStream os=System.out;
OutputStreamWriter osw=new OutputStreamWriter(os);
BufferedWriter bw=new BufferedWriter(osw);
bw.writer(String line);

标准键盘录入，System.in
InputStream is=System.in;
InputStreamReader isr=new InputStream(is);
BufferedReader br=new BufferedReader(isr);
String line =br.readLine();
输出。
OutputStream os=System.out;
OutputStreamWriter osw=new OutputStreamWriter(os);
BufferedWriter bw=new BufferedWriter(osw);
bw.writer(String line);