Sample

package com.example.collectionframework.demo;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

public class ListDemo {
    public static void main(String[] args) {
//        rawListDemo();
        ArraylistsDemo();
        linkedListDemo();
    }

    // removals and insertions
    private static void linkedListDemo() {
        List<String> linkedList = new LinkedList<>();
        linkedList.add("hello");
        linkedList.add(1,"world");
        linkedList.add(2,"from java");
        System.out.println(linkedList);
        linkedList.remove("hello");
        String[] stringsArray = linkedList.toArray(new String[0]);
        System.out.println(stringsArray);

        linkedList.sort(Comparator.naturalOrder());
    }

    // accessing faster
    private static void ArraylistsDemo() {
        // Concrete List with type
        // String, Integer, Double, Float, Boolean, Course
        List<String> strings = new ArrayList<String>();
        List<String> stringList = new ArrayList<>();
        strings.add("hello");
        strings.add("world");
        strings.add(null);
        // strings.add(1);
        strings.add(1, "java");
        strings.addAll(List.of("l1", "l2", "l3", "l4"));
        strings.addAll(4, Arrays.asList("m1", "m2", null, "m3", null));
        
        int listSize = strings.size();
        String s = strings.get(0);
        // 1st way
        for(int i=0;i<strings.size();i++) {
            System.out.print(strings.get(i)+" "); // continue and break
        }
        System.out.println();

        // 2nd way
        strings.forEach(str -> {
            System.out.println(str); // continue and break are not supported
        });

        // 3rd way
        for(String str : strings){ // continue not supported, break is supported

        }
        
        strings.removeIf(s1 -> Objects.isNull(s1)); // delete basis condition
        strings.remove("l1");
        strings.remove(3);
        
        // streaming elements
        System.out.println(strings.stream().filter(s1 -> s1.length() > 4).collect(Collectors.toList()));
        
        // remove in bulk
        strings.removeAll(Arrays.asList("l1", "l2", "l3"));
        System.out.println("strings after removal of l1, and l2" + strings);
        strings.retainAll(Arrays.asList("m1", "m2", "m3"));
        System.out.println("strings after retain of m1, and m2" + strings);
        
        // check if element exists
        boolean m2Exists = strings.contains("m2");
        int m2Index = strings.indexOf("m2"); // if not exists it gives u -1
        
        // clear the list
        strings.clear();
    }

    private static void rawListDemo() {
        // Raw List
        List list = new ArrayList();
        list.add(10);
        list.add("hello");
        list.add(true);
        System.out.println(list);

        Integer i1 = (Integer) list.get(0);
        System.out.println(i1);

        String str = (String) list.get(0);
        System.out.println(str);
    }
}