29_Some concepts of advance java

// Array List

package com.company;
import java.util.*;
public class arraylist {
    public static void main(String[] args) {
        ArrayList<Integer> l1 = new ArrayList<>();
        ArrayList<Integer>l2 = new ArrayList<>(5);
        l2.add(27);
        l2.add(0,26);
        l2.add(57);
        l2.add(17);
        l2.add(97);
        l1.add(3);
        l1.add(5);
        l1.add(7);
        l1.add(1);
        l1.add(0,3);
        l1.add(0,2);
        l1.addAll(0,l2);
        System.out.println(l1.contains(5));

        System.out.println(l1.indexOf(17));
        System.out.println(l1.indexOf(333));      // Gives -1 as output
        System.out.println(l1.indexOf(3));
        System.out.println(l1.lastIndexOf(3));
//        System.out.println(l1.remove(3));
        l1.set(1,99);
        System.out.println(l1.isEmpty());
        System.out.println(l1.iterator());
//        l1.clear();
//
        for (int i=0; i<l1.size(); i++){
            System.out.print(l1.get(i));
            System.out.print(", ");
        }
    }
}


                                                   // Linked List


package com.company;

import java.util.ArrayList;
import java.util.*;

public class linkedlist {
    public static void main(String[] args) {
        LinkedList<Integer> l1 = new LinkedList<>();
        LinkedList<Integer>l2 = new LinkedList<>();
        l2.add(27);
        l2.add(0,26);
        l2.add(57);
        l2.add(17);
        l2.add(97);
        l1.add(3);
        l1.add(5);
        l1.add(7);
        l1.add(1);
        l1.add(0,3);
        l1.add(0,2);
        l1.addAll(0,l2);
        l1.addLast(55);
        l1.addFirst(85);
        System.out.println(l1.contains(5));

        System.out.println(l1.indexOf(17));
        System.out.println(l1.indexOf(333));      // Gives -1 as output
        System.out.println(l1.indexOf(3));
        System.out.println(l1.lastIndexOf(3));
//        System.out.println(l1.remove(3));
        l1.set(1,99);
        System.out.println(l1.isEmpty());
        System.out.println(l1.iterator());
//        l1.clear();
//
        for (int i=0; i<l1.size(); i++){
            System.out.print(l1.get(i));
            System.out.print(", ");
        }
    }
}


                                                       // Array Dequeue



package com.company;

import java.util.ArrayDeque;

public class arraydeque {
    public static void main(String[] args) {
        ArrayDeque<Integer> ad1 = new ArrayDeque<>();
        ad1.add(3);
        ad1.add(37);
        ad1.add(22);
        ad1.addFirst(59);
        ad1.offerFirst(29);
        ad1.pollLast();
        ad1.pollFirst();
        ad1.peekFirst();
        ad1.peekLast();
        System.out.println(ad1.getFirst());
        System.out.println(ad1.getLast());
        System.out.println(ad1.contains(37));
        System.out.println(ad1.contains(3));
    }
}



                                                          // Hashset



package com.company;

import java.util.HashSet;

public class set {
    public static void main(String[] args) {
        HashSet<Integer> myHashSet = new HashSet<>(88,2.8f);
        myHashSet.add(4);
        myHashSet.add(4);
        myHashSet.clear();
        myHashSet.add(55);
        myHashSet.add(12);
        myHashSet.add(2);
//        myHashSet.clear();
        System.out.println(myHashSet);
    }
}


                                                            // Date and Time in java



package com.company;

import java.util.Date;
import java.util.SortedMap;

public class date {
    public static void main(String[] args) {
        System.out.println(System.currentTimeMillis()/1000/3600/24/365);   // Shows total years passed after 1970
//        System.out.println(Long.MAX_VALUE);
//        System.out.println(System.currentTimeMillis());

        Date d = new Date();
        System.out.println(d);       // Shows current date, time and year
        System.out.println("Today's date and time is: "+d);
        System.out.println(d.getTime());
        System.out.println(d.getDate());
        System.out.println(d.getMonth());
        System.out.println(d.getYear());
    }
}


                                                                 // Calender



package com.company;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class calender {
    public static void main(String[] args) {
        Calendar c = Calendar.getInstance();
        System.out.println(c.getCalendarType());
        System.out.println(c.getTimeZone());
        System.out.println(c.getWeeksInWeekYear());
        GregorianCalendar cal = new GregorianCalendar();
        System.out.println(cal.isLeapYear(2032));


        LocalDate ld = LocalDate.now();
//        System.out.println(ld);
//
//
//        LocalTime lt = LocalTime.now();
//        System.out.println(lt);

        LocalDateTime ldt = LocalDateTime.now();
        System.out.println(ldt);
    }
}