java 采用BufferReader方式输入数据

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class BufferdReaderDemo1 {
public static void main(String[] args) {
BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
String str=null;
System.out.println("请输入内容:");
try{
str=buf.readLine();
}catch(IOException e){
e.printStackTrace();
}
System.out.println("输入的内容为："+str);
}
}