java截取输入字符串的问题

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Demo {
public static void main(String[] args) {
BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

String str = "";
try {
str = buf.readLine();
} catch (IOException e) {
e.printStackTrace();
}
String[] ss = str.split(" ");
for(int i = 0;i<ss.length;i++){
System.out.println(ss[i]);
}
}
}

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String s=null;
try
{
s=br.readLine();
}
catch(IOException e)
{
e.printStackTrace();
}
String strArray[]=s.split(" ");
for(int i=0;i<strArray.length;i++)
{
System.out.println(strArray[i]);
}