[英]Sorting BufferedWriter string output by distinct value in java
I have this function: 我有这个功能:
It gets me all the data that I want but I need to sort the output by the work time. 它获取了我想要的所有数据,但我需要按工作时间对输出进行排序。 I can't figure out how to sort the data I'm getting. 我不知道如何对我得到的数据进行排序。
Any tips are appreciated. 任何提示表示赞赏。
raportBtn.setOnAction(event -> {
Writer writer=null;
try {
File file = new File("C:/user/raport.txt");
writer = new BufferedWriter(new FileWriter(file));
for(Employee emp:listOfEmployees){
String text = emp.getName() + " " + emp.getSurname()+ " " + emp.getRoom() + " " + emp.getWorkStart() + " " + emp.getWorkEnd() + " " + emp.getWorkTime() + "\n";
writer.write(text);
}
} catch (IOException e) {
e.printStackTrace();
} finally{
{
try{
writer.flush();
}catch(IOException e){
e.printStackTrace();
}
try{
writer.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
});
Everything you need is to implement a Comparator. 您所需要做的只是实现一个比较器。 Let's say that you want to sort the list by age(ascending). 假设您要按年龄(升序)对列表进行排序。 Then: 然后:
import java.util.Comparator;
public class EmployeesComparator implements Comparator<Employee> {
@Override
public int compare(Employee o1, Employee o2) {
return o1.age - o2.age;
}
}
Then, you can use it like this: 然后,您可以像这样使用它:
Collections.sort(listOfEmployees, new EmployeesComparator());
Hope that helps! 希望有帮助!
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