1,
BufferedInputStream bin = new BufferedInputStream(System.in);
InputStreamReader insr = new InputStreamReader(bin);
BufferedReader br = new BufferedReader(insr);
String str = br.readLine();
2, InputStreamReader insr = new InputStreamReader(in);
BufferedReader br = new BufferedReader(insr);
String str = br.readLine();
BufferedInputStream bin = new BufferedInputStream(System.in);
InputStreamReader insr = new InputStreamReader(bin);
BufferedReader br = new BufferedReader(insr);
String str = br.readLine();
2, InputStreamReader insr = new InputStreamReader(in);
BufferedReader br = new BufferedReader(insr);
String str = br.readLine();
InputStreamReader是面向字符的,可以用来读取文件