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nilandevnilandev
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Added collections, exception handling, interface and abstract class examples
1 parent 164de42 commit 3d68ab1

31 files changed

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‎src/com/stacktips/collections/list/arraylist/_1a_ArrayList.java‎

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package com.stacktips.collections.list.arraylist;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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public class _1a_ArrayList {
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public static void main(String[] args) {
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//Using the Default Constructor
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List<String> list1 = new ArrayList<>();
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list1.add("Apple");
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list1.add("Banana");
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// Using Constructor with Initial Capacity
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List<String> list2 = new ArrayList<>(20);
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list2.add("Apple");
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list2.add("Banana");
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//Initializing array collections.list using the anonymous inner class method
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List<String> list3 = new ArrayList<String>() {{
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add("Apple");
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add("Banana");
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add("Orange");
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}};
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// fixed-size collections.list from the elements of another collection
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List<String> list4 = Arrays.asList("Apple", "Banana", "Orange");
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List<String> list5 = new ArrayList<>(list4);
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// Using Arrays.asList method
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List<String> list6 = new ArrayList<>(Arrays.asList("Apple", "Banana", "Orange"));
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// Using Collections.addAll method
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List<String> list7 = new ArrayList<>();
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Collections.addAll(list7, "Apple", "Banana", "Orange");
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// Using Java8 streams and collectors
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List<String> list8 = Stream.of("Apple", "Banana", "Orange")
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.collect(Collectors.toCollection(ArrayList::new));
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System.out.println(list1.get(1));
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System.out.println(list2.contains("Banana"));
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}
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}

‎src/com/stacktips/collections/list/arraylist/_2a_ImmutableList.java‎

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package com.stacktips.collections.list.arraylist;
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import java.util.List;
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public class _2a_ImmutableList {
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public static void main(String[] args) {
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List<String> immutableList = List.of("A", "B", "C");
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System.out.println(immutableList);
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immutableList.add("D"); // throws UnsupportedOperationException
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System.out.println(immutableList);
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}
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}

‎src/com/stacktips/collections/list/arraylist/_2b_UnmodifiableListExample.java‎

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package com.stacktips.collections.list.arraylist;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class _2b_UnmodifiableListExample {
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public static void main(String[] args) {
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List<String> list = new ArrayList<>();
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list.add("A");
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list.add("B");
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list.add("C");
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List<String> unmodifiableList = Collections.unmodifiableList(list);
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System.out.println(unmodifiableList);
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unmodifiableList.add("D"); // throws UnsupportedOperationException
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System.out.println(unmodifiableList);
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}
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}

‎src/com/stacktips/collections/list/arraylist/_3a_NonSynchronizedArrayList.java‎

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package com.stacktips.collections.list.arraylist;
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import java.util.ArrayList;
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import java.util.List;
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public class _3a_NonSynchronizedArrayList {
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public static void main(String[] args) {
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List<Integer> arrayList = new ArrayList<>();
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// Create a runnable task that adds elements to the collections.list
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Runnable addItemsTask = () -> {
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for (int i = 0; i < 1000; i++) {
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arrayList.add(i);
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}
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};
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// Create multiple threads that will run the addItemsTask
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Thread thread1 = new Thread(addItemsTask);
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thread1.start();
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Thread thread2 = new Thread(addItemsTask);
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thread2.start();
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try {
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thread1.join();
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thread2.join();
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} catch (InterruptedException e) {
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System.out.println(e.getMessage());
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}
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System.out.println("Size of List: " + arrayList.size());
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}
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}

‎src/com/stacktips/collections/list/arraylist/_3b_SynchronizedArrayList.java‎

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package com.stacktips.collections.list.arraylist;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class _3b_SynchronizedArrayList {
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public static void main(String[] args) {
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List<Integer> arrayList = Collections.synchronizedList(new ArrayList<>());
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// Create a runnable task that adds elements to the collections.list
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Runnable addItemsTask = () -> {
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for (int i = 0; i < 1000; i++) {
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arrayList.add(i);
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}
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};
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// Create multiple threads that will run the addItemsTask
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Thread thread1 = new Thread(addItemsTask);
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thread1.start();
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Thread thread2 = new Thread(addItemsTask);
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thread2.start();
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try {
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thread1.join();
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thread2.join();
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} catch (InterruptedException e) {
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System.out.println(e.getMessage());
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}
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System.out.println("Size of List: " + arrayList.size());
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}
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}

‎src/com/stacktips/collections/list/copyonwritearraylist/_1a_ConcurrentModificationException.java‎

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package com.stacktips.collections.list.copyonwritearraylist;
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import java.util.ArrayList;
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import java.util.List;
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public class _1a_ConcurrentModificationException {
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public static void main(String[] args) {
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List<String> list = new ArrayList<>();
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list.add("Apple");
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list.add("Banana");
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list.add("Guava");
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list.add("Grapes");
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for (String value : list) {
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if (value.equals("Banana")) {
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list.remove("Grapes");
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}
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}
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System.out.println(list);
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}
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}

‎src/com/stacktips/collections/list/copyonwritearraylist/_1b_CopyOnWriteArrayList.java‎

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package com.stacktips.collections.list.copyonwritearraylist;
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import java.util.List;
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import java.util.concurrent.CopyOnWriteArrayList;
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public class _1b_CopyOnWriteArrayList {
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public static void main(String[] args) {
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List<String> list = new CopyOnWriteArrayList<>();
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list.add("Apple");
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list.add("Banana");
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list.add("Guava");
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list.add("Grapes");
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for (String value : list) {
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if (value.equals("Banana")) {
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list.remove("Grapes");
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}
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}
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System.out.println(list);
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}
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}

‎src/com/stacktips/collections/list/linkedlist/Song.java‎

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package com.stacktips.collections.list.linkedlist;
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public record Song(String title, String artist) {
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}

‎src/com/stacktips/collections/list/linkedlist/_1a_MusicPlayList.java‎

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package com.stacktips.collections.list.linkedlist;
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import java.util.LinkedList;
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public class _1a_MusicPlayList {
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private final LinkedList<Song> playlist;
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public _1a_MusicPlayList() {
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playlist = new LinkedList<>();
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}
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public void addSong(Song song) {
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playlist.add(song);
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}
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public void removeSong(Song song) {
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playlist.remove(song);
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}
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public void displayPlaylist() {
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for (int i = 0; i < playlist.size(); i++) {
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System.out.println((i + 1) + ". " + playlist.get(i));
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}
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}
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public static void main(String[] args) {
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_1a_MusicPlayList myPlaylist = new _1a_MusicPlayList();
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Song song1 = new Song("Bohemian Rhapsody", "Queen");
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Song song2 = new Song("Imagine", "John Lennon");
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Song song3 = new Song("Hotel California", "Eagles");
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myPlaylist.addSong(song1);
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myPlaylist.addSong(song2);
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myPlaylist.addSong(song3);
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System.out.println("My Playlist:");
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myPlaylist.displayPlaylist();
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System.out.println("Removing 'Imagine' from playlist.");
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myPlaylist.removeSong(song2);
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System.out.println("Updated Playlist:");
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myPlaylist.displayPlaylist();
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}
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}

‎src/com/stacktips/collections/list/stack/_1a_TextEditor.java‎

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package com.stacktips.collections.list.stack;
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import java.util.Stack;
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public class _1a_TextEditor {
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private final Stack<String> textStack = new Stack<>();
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private final Stack<String> undoStack = new Stack<>();
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public void type(String text) {
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textStack.push(text);
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undoStack.clear();
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}
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public void undo() {
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if (!textStack.isEmpty()) {
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String lastText = textStack.pop();
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undoStack.push(lastText);
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} else {
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System.out.println("Nothing to undo.");
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}
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}
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public void redo() {
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if (!undoStack.isEmpty()) {
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String lastUndoText = undoStack.pop();
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textStack.push(lastUndoText);
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} else {
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System.out.println("Nothing to redo.");
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}
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}
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public void display() {
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System.out.println("Current Text: " + String.join("", textStack));
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}
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public static void main(String[] args) {
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_1a_TextEditor editor = new _1a_TextEditor();
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editor.type("Hello, ");
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editor.type("world!");
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editor.display();
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editor.undo();
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editor.display();
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editor.redo();
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editor.display();
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editor.undo();
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editor.undo();
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editor.display();
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editor.redo();
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editor.display();
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}
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}
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