Anyone could tell me what my fault is ..pls...

for (int i = 0;i<5;i++) strings.add(reader.readLine()); int len = strings.get(0).length(); for (int i = 0;i<5;i++) if (strings.get(i).length()>=len) len = strings.get(i).length(); for(int i = 0 ; i<5;i++) if (strings.get(i).length() == len) System.out.println(strings.get(i));

package zh.codegym.task.task07.task0708; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.List; /* 最长的字符串 */ public class Solution { private static List<String> strings; public static void main(String[] args) throws Exception { //在此编写你的代码 BufferedReader reader=new BufferedReader(new InputStreamReader(System.in)); strings = new ArrayList<String>(); int i=0; int [] arr=new int[5]; while(i<5) { String A=reader.readLine(); strings.add(A); arr[i]=strings.get(i).length(); i++; } int j=0; int max=arr[0]; int index=0; int two=0; while(j<5) { if(max<arr[j]) { max=arr[j]; index=j; } if(max==arr[j]) { two=j; } j++; } System.out.println(strings.get(index)); System.out.println(strings.get(two)); } } I think i'am right!

要求在 main 方法中初始化列表，你是在公共类中初始化的。改了就能通过测试

//just copied your code and change the format...and passed the test..don't know why public class Solution { private static ArrayList<String> strings; public static void main(String[] args) throws Exception { //在此编写你的代码 strings = new ArrayList(); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); for (int i = 0; i < 5; i ++){ strings.add(reader.readLine()); } int maxLength = -1; for (String s : strings){ if (s.length() > maxLength){ maxLength = s.length(); } } //System.out.println(maxLength); for (String s : strings){ if (s.length() == maxLength){ System.out.println(s); } } } }