JetBrains Academy: LocalTime - Kamil-Jankowski/Learning-JAVA GitHub Wiki

JetBrains Academy: LocalTime

Seconds since start of a day:

Write a program that reads a number of seconds from the start of a day and prints the current time.

If the resulting time has zero seconds, do not output them.

import java.util.Scanner;
import java.time.LocalTime;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int seconds = Integer.parseInt(scanner.nextLine());
        LocalTime time = LocalTime.ofSecondOfDay(seconds);
        System.out.println(time);
    }
}

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Some hours and minutes ago:

Write a program that reads a point in time and prints another point in time at the specified number of hours and minutes before the given one.

Input data format The first line contains a point in time in hours:minutes format. The second line contains two numbers: hours and minutes separated by a space.

Output data format The single output line should contain a point in time before the input time in the same format.

import java.util.Scanner;
import java.time.LocalTime;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        LocalTime time = LocalTime.parse(scanner.nextLine());
        String[] parameters = scanner.nextLine().split("\\s+");
        int h = Integer.parseInt(parameters[0]);
        int m = Integer.parseInt(parameters[1]);
        
        LocalTime timeBefore = time.minusHours(h).minusMinutes(m);
        System.out.println(timeBefore);
    }
}

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Seconds between two time points:

Implement a method that takes two instances of LocalTime and determines how many seconds are between them.

import java.time.LocalTime;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int time1 = LocalTime.parse(scanner.nextLine()).toSecondOfDay();
        int time2 = LocalTime.parse(scanner.nextLine()).toSecondOfDay();
        int difference = Math.abs(time1 - time2);
        
        System.out.println(difference);
    }
}

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Return time without seconds:

Write a program that reads a point in time and outputs the same time without seconds.

import java.util.Scanner;
import java.time.LocalTime;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        LocalTime time = LocalTime.parse(scanner.nextLine()).withSecond(0);
        System.out.println(time);
    }
}

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