基礎題, 代碼如下:

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

public class Main {

    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        if(str.length() <= 7 && !str.equals("")) {
            System.out.print(
 
"Hello " + str);
        } else {
            return;
        }
    }

}

2018/12/08 L1-045 宇宙無敵大招呼 java