Design a class named Clock. You should use your IDE for this exercise. The class

Question

Design a class named Clock. You should use your IDE for this exercise. The class contains private data fields for startTime and stopTime, a no argument constructor that initializes the startTime to the current time, a method named start() that resets the startTime to the given time, a stop()method that sets the endTime to the given time and a getElapsedTime() method that returns the elapsed time in seconds. Create a TestClock class to construct a Clock instance and return the elapsed time. Command line arguments should be used to send the start and end times. You should use the java.timeclasses Here is samplerun: java TestClock 11:45:12 11:48:13 Elapsed time in seconds is:181

Explanation / Answer

Clock.java

import java.time.LocalTime;

public class Clock {

    // Private data fields
    private LocalTime startTime;
    private LocalTime stopTime;

    // No-argument contsructor that sets startTime
    public Clock() {
        this.startTime = LocalTime.now();
    }

    // start() method that sets startTime to args[0]
    public LocalTime start(LocalTime start) {
        return this.startTime = start;
    }

    // stop() method that sets stopTime to args[1]
    public LocalTime stop(LocalTime stop) {
        return this.stopTime = stop;
    }

    // Method that calculates the seconds between args
    public long getElapsedTime() {
        return java.time.Duration.between(
                this.startTime, this.stopTime
        ).getSeconds();
    }

    // Getters

    public LocalTime getStartTime() {
        return startTime;
    }

    public LocalTime getStopTime() {
        return stopTime;
    }
}

TestClock.java
import java.time.LocalTime;

public class TestClock {

    public static void runClock(LocalTime startArg, LocalTime stopArg) {
        // Creates a new Clock class named ticker
        Clock ticker = new Clock();
        // Uses the first argument to set the startTime
        ticker.start(startArg);
        // Uses the second argument to set the stopTime
        ticker.stop(stopArg);
        // Displays startTime and stopTime
        System.out.println("java TestClock " +
                ticker.getStartTime() + " " + ticker.getStopTime());
        // Uses getElapsedTime to display the seconds between the two args
        System.out.println("Elapsed time in seconds is: " +
                ticker.getElapsedTime());
    }

    public static void main(String[] args) {
        // Passes arguments to the runClock method above
        runClock(LocalTime.parse(args[0]), LocalTime.parse(args[1]));
    }
}

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