Java Duration Class, cannot resolve to a type

Question

I am trying to find the difference in time between two LocalTime objects in HH:MM:SS format and my duration object is giving me the error Duration.between cannot be resolved to a type. The between description on Java docs explicitly says LocalTime objects are valid- do I have to translate my objects into LocalDateTime objects with zones for Duration to work?

Only other theory on this issue would be my placement of this class in my Make file, but I would think my import would take care of the issue during compilation. Code below:

import java.time.*;
import java.time.Duration;


public class Station {
    int stationNumber;
    String stationAddress;
    ArrayList<Driver> drivers;
    ArrayList<Road> roads;          
    double[][] roadMap;             

    public Station(int sNumber, String sAddress) {
        stationNumber = sNumber;
        stationAddress = sAddress;
        drivers = new ArrayList<Driver>();
        
        roads = new ArrayList<Road>(5);
        roadMap = new double[5][5];
    }

    public static void calculateNewTimes(ArrayList<roadDataToBeSorted> delDataIncreasingTime) {
        LocalTime firstStop = LocalTime.parse(delDataIncreasingTime.get(0).rdDeliveryTime);
        LocalTime lastStop = LocalTime.parse(delDataIncreasingTime.get(delDataIncreasingTime.size()-1).rdDeliveryTime);
        Duration duration = new Duration.between(firstStop, lastStop); ***<-----ISSUE***

Basil Bourque · Accepted Answer · 2022-03-15 21:50:42Z

5

between is a static factory method of Duration class, returning a Duration object.

So you don't need to create Duration object using the new keyword.

Duration duration = Duration.between(firstStop, lastStop);

edited Mar 15, 2022 at 21:50

Basil Bourque

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answered Mar 15, 2022 at 20:28

Sergey Afinogenov

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7 Comments

CoolHands Over a year ago

That's it, I looked too deep first. What does your process for diagnosing a bug look like? I need a better approach

Zabuzard Over a year ago

Use a proper IDE (Intellij, Eclipse, ...), it will tell you such minor mistakes immediately.

CoolHands Over a year ago

I'm using VS code, so I definitely don't have the same level of support for Java. I like being able to work on several different languages in the same IDE, would you recommend I get tailored IDE's? I primarily work with the MEAN stack

GriffeyDog Over a year ago

Since Java allows you to call static methods via an instance, this is not the entire answer. The error message comes from the OP trying to create an instance of some nested class of Duration named between (note what follows the new keyword), which obviously doesn't exist.

Sergey Afinogenov Over a year ago

@CoolHands I didn't run your code, but I just got what the problem is in Duration.between statement

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