PTA 字符串读取不到最后一行

Question

import java.io.*;
import java.util.ArrayList;
import java.util.Collections;

class StringController implements Comparable<StringController>{
    public String str;
    public int length;

    public StringController(String str){
        this.str=str;
        this.length=str.length();
    }

    @Override
    public int compareTo(StringController stringController){
        int thisLength=this.length;
        int scLength=stringController.length;
        if(thisLength<scLength){
            return -1;
        }
        return 1;
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw = new PrintWriter(System.out);

        String str;
        while (!(str=br.readLine()).equals("")) {
            int total=-1;
            try {
                total = Integer.parseInt(str);
            } catch (NumberFormatException ignored) {}
            ArrayList<StringController> stringControllers = new ArrayList<>();
            for(int i=0;i<total;i++){
                String temp = br.readLine();
                if(temp.equals("stop")){
                    break;
                }
                StringController stringController = new StringController(temp);
                stringControllers.add(stringController);
            }
            Collections.sort(stringControllers);
            for(StringController stringController:stringControllers){
                pw.println(stringController.str);
            }
        }
        pw.flush();
    }
}

测试用例答案测出来是没问题的，但是输入后要在控制台多打一个回车才能跳出来答案。如下图

这样跑到线上平台去测就跳不出运行结果了。请问具体怎么解决？

Answer 1

//你用了这个，它要结束，就要再读取一个，然后equals返回false才会跳出来。
while (!(str=br.readLine()).equals(""))

感觉没必要用while，直接readLine就行，读一个输入个数