很菜

Question

import java.io.*;
 public class Test
 {
  public static void main(String[] args)
  {
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  try{
  String s=br.readLine();
  if(s.length()<=0)
  System.out.println("HELLO");
  else
  System.out.println(s);
  }
  catch(IOException e)
  {
   
  }
  }
 }
^_^，开心接分

Answer 1

import java.io.*;
 public class Test
 {
  public static void main(String[] args)
  {
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  try{
  String s=br.readLine();
  if(s.trim().length()<=0)//改掉一个输入空格按enter的错误加
                                                   //了个trim()
  System.out.println("HELLO");
  else
  System.out.println(s);
  }
  catch(IOException e)
  {
   
  }
  }
 }