rmg007

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Month;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Locale;
import java.time.LocalDateTime;

public class LocalDateTimeExample {
    public static void main(String[] args) {

rmg007

import java.time.Duration;
import java.time.LocalTime;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;

public class LocalTimeExample {
    public static void main(String[] args) {

        LocalTime now = LocalTime.now();
        System.out.println("now: " + now);

rmg007

import java.time.*;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;

public class LocalDateExample {
    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        System.out.println("today: " + today);

rmg007

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/*
    Date starts from 1900
    Unix epoch:  Time starts from 1970-1-1
 */
public class DateCalendarExamples{

rmg007

import java.text.SimpleDateFormat;
import java.util.Date;

/*
    Date starts from 1900
    Unix epoch:  Time starts from 1970-1-1

    There ara three common date formats:
        D M Y
        Y M D

rmg007

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class SortStringBySecondChar {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(List.of("Byyyyyyyyyyyy", "Dww", "Cxxxxxx", "az"));

       Comparator<String> sortBySecondCharComparator = (s1, s2) -> Integer.compare(s2.charAt(1), s1.charAt(1));

rmg007

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class SortStringListByLength {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(List.of("Byyyyyyyyyyyy", "Dww", "Cxxxxxx", "az"));

        Comparator<String> lengthComparator = Comparator.comparingInt(String::length);
        Comparator<String> lengthComparator2 = (s1, s2) -> Integer.compare(s1.length(), s2.length());

rmg007

import java.util.ArrayList;
import java.util.List;

public class SortStringListUsingCaseInsensitiveOrderComparator {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(List.of("Byyyyyyyyyyyy", "Dww", "Cxxxxxx", "az"));
        list.sort(String.CASE_INSENSITIVE_ORDER);
        //output: [az, Byyyyyyyyyyyy, Cxxxxxx, Dww]
        System.out.println(list);
    }

rmg007

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class SortStringListUsingComparatorNaturalOrder {
    public static void main(String[] args) {

        /*
        In this line of code there are four strings first one is starting with B
        and last one is starting with a,

rmg007

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class SortListUsingComparatorNullsFirst {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>(){{
            add(6);
            add(null);
            add(8);