It says that after load my list is empty.
I just cannot figure it out what's wrong with my code.
package zh.codegym.task.task20.task2002;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.List;
import java.text.SimpleDateFormat;
/*
读取并写入文件CodeGym
*/
public class Solution {
public static void main(String[] args) {
// 你可以在 TMP 目录中找到 your_file_name.tmp，或者按照文件的实际位置调整 outputStream/inputStream
try {
File yourFile = File.createTempFile("你的文件名", null);
OutputStream outputStream = new FileOutputStream(yourFile);
InputStream inputStream = new FileInputStream(yourFile);
CodeGym codeGym = new CodeGym();
// 在此初始化 codeGym 对象的 users 字段
codeGym.save(outputStream);
outputStream.flush();
CodeGym loadedObject = new CodeGym();
loadedObject.load(inputStream);
// 在此检查 codeGym 对象是否等于 loadedObject 对象
outputStream.close();
inputStream.close();
} catch (IOException e) {
//e.printStackTrace();
System.out.println("糟糕，我的生活出现问题了");
} catch (Exception e) {
//e.printStackTrace();
System.out.println("糟糕，save/load 方法出现问题");
}
}
public static class CodeGym {
public List<User> users = new ArrayList<>();
public void save(OutputStream outputStream) throws Exception {
PrintWriter writer = new PrintWriter(outputStream);
//String isUsersPresent = users != null ? "Yes" : "No";
//writer.println(isUsersPresent);
if (!users.isEmpty() && equals(users)) {
for (User user : users) {
writer.println(user.getFirstName());
writer.println(user.getLastName());
writer.println(user.getBirthDate());
writer.println(user.isMale());
writer.println(user.getCountry());
}
}
writer.flush();
// 实现此方法
}
public void load(InputStream inputStream) throws Exception {
Scanner scanner = new Scanner(inputStream);
while (scanner.hasNext()) {
User user = new User();
user.setFirstName(scanner.nextLine());
user.setLastName(scanner.nextLine());
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
user.setBirthDate(sdf.parse(scanner.nextLine()));
user.setMale(Boolean.getBoolean(scanner.nextLine()));
user.setCountry(User.Country.valueOf(scanner.nextLine()));
users.add(user);
}
scanner.close();
// 实现此方法
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CodeGym codeGym = (CodeGym) o;
return Objects.equals(users, codeGym.users);
}
@Override
public int hashCode() {
return users != null ? users.hashCode() :0;
}
}
}