[tr] [/tr]
[tr] [/tr]
[tr] [/tr]
[tr] [/tr]
[tr] [/tr]
[tr] [/tr]

只会涉及  键盘 屏幕,不会涉及 文件
通过  标准  输入   输出  流
从键盘读	InputStream  is = System.in;     InputStreamReader isr = new InputStreamReader(is);     BufferedReader br = new BufferedReader(isr);
				写到屏幕	OutputStream  os = System.out;     OutputStreamWriter osw = new OutputStreamWriter(os);     BufferedWriter bw  = new  BufferedWriter(osw);
								通过  普通    输入  输出  流
								从键盘读	new  Scanner(System.in).nextLine();
写到屏幕	System.out.println(line)

过来给你顶一个