转换流是将java不允许的情况变成可能
import java.io.*;
public class Test{
public static void main(String[] args) throws Exception{
String zfc=null;
try{
BufferedReader zhl=new BufferedReader(new InputStreamReader(System.in));
//System.in是字节流 转换成字符流
zfc=zhl.readLine();
System.out.println("字符串是:"+zfc);
}
catch(Exception e){
}
}
}