Following is an example to implement Pair class from Unit class in Java −Exampleimport org.javatuples.Unit; import org.javatuples.Pair; public class MyDemo {    public static void main(String[] args) {       Unit unit = Unit.with("Tutorial");       System.out.println("Unit class element: " + unit);       Pair pair = unit.addAt0("Learning");       System.out.println("Pair (Implemented from Unit Tuple): " + pair);    } }OutputUnit class element: [Tutorial] Pair (Implemented from Unit): [Learning, Tutorial]Let us see another example wherein we will be implementing Pair class from Unit class −Exampleimport org.javatuples.Unit; import org.javatuples.Pair; public class MyDemo {    public static void ... Read More

To sort an ArrayList, you need to use the Collections.sort() method. This sorts in ascending order, but if you want to sort the ArrayList in descending order, use the Collections.reverseOrder() method as well. This gets included as a parameter −Collections.sort(myList, Collections.reverseOrder());Following is the code to sort an ArrayList in descending order in Java −Example Live Demoimport java.util.ArrayList; import java.util.Collections; public class Demo {    public static void main(String args[]) {       ArrayList myList = new ArrayList();       myList.add(30);       myList.add(99);       myList.add(12);       myList.add(23);       myList.add(8);       ... Read More

At first create Septet and add elements −Septet    septet = new Septet(    "Laptop", "Desktop", "Tablet", "Notebook", "Phone", "Reader", "LCD");Now, implement Octet from Septet −Octet octet = septet.add("LED");Following is an example to implement Octet class from Septet class in Java −Exampleimport org.javatuples.Septet; import org.javatuples.Octet; public class MyDemo {    public static void main(String[] args) {       Septet          septet = new Septet(          "Laptop", "Desktop", "Tablet", "Notebook", "Phone", "Reader", "LCD");       System.out.println("Septet elements = " + septet);       Octetoctet = septet.add("LED");       System.out.println("Octet (implemented from ... Read More

Following is an example to implement Ennead class from Octet class in Java −Exampleimport org.javatuples.Octet; import org.javatuples.Ennead; public class MyDemo {    public static void main(String[] args) {       Octet          octet = new Octet(          "Jack", "Tom", "Steve", "Tim", "Nathan", "Ryan", "Kevin", "Katie");       System.out.println("Octet elements = " + octet);       Enneadennead = octet.add("Scarlett");       System.out.println("Ennead (implemented from Octet): " + ennead);    } }OutputOctet elements = [Jack, Tom, Steve, Tim, Nathan, Ryan, Kevin, Katie] Ennead (implemented from Octet): [Jack, Tom, Steve, Tim, Nathan, Ryan, ... Read More

Following is an example to implement Decade Class from Ennead Class in Java using JavaTuples −Exampleimport org.javatuples.Decade; import org.javatuples.Ennead; public class MyDemo {    public static void main(String[] args) {       Ennead e =          Ennead.with("Katie", "Tom", "Ryan", "Tom", "Bradley", "David", "Steve", "Brad", "Jacob");       System.out.println("Ennead elements= " + e);       Decade decade = e.add("Amy");       System.out.println("Decade elements (implemented from Ennead) = " + decade);    } }OutputEnnead elements= [Katie, Tom, Ryan, Tom, Bradley, David, Steve, Brad, Jacob] Decade elements (implemented from Ennead) = [Katie, Tom, Ryan, Tom, Bradley, ... Read More

To sort TreeSet in descending order, use the descendingSet() method in Java.The descendingSet() method is used to return a reverse order view of the elements contained in this set.At first, create a TreeSet −TreeSet treeSet = new TreeSet();Then add some elements −treeSet.add(45); treeSet.add(15); treeSet.add(99); treeSet.add(70);Sort them indecreasing order −TreeSet res = (TreeSet)treeSet.descendingSet();Following is the code to sort TreeSet in descending order −Example Live Demoimport java.util.TreeSet; public class Main {    public static void main(String[] args) {       TreeSet treeSet = new TreeSet();       treeSet.add(45);       treeSet.add(15);       treeSet.add(99);       treeSet.add(70);       ... Read More

To sort HashSet in Java, you can use another class, which is TreeSet.Following is the code to sort HashSet in Java −Example Live Demoimport java.util.*; public class Main {    public static void main(String args[]) {       Set hashSet = new HashSet();       hashSet.add("green");       hashSet.add("blue");       hashSet.add("red");       hashSet.add("cyan");       hashSet.add("orange");       hashSet.add("green");       System.out.println("HashSet elements"+ hashSet);       Set treeSet = new TreeSet(hashSet);       System.out.println("Sorted elements"+ treeSet);    } }OutputHashSet elements [red, orange, green, blue, cyan] Sorted elements [blue, cyan, ... Read More

In this article, we will learn how to sort an ArrayList in ascending order using Java. Sorting allows us to arrange elements in a specific order. We will use the Collections.sort() method, which simplifies sorting, whether you're dealing with integers or strings. The program will demonstrate sorting an ArrayList of numbers and names in ascending order. Problem Statement Write a Java program that sorts an ArrayList of elements in ascending order. We'll look at two examples—one with integer values and another with string values. Input 1 Points[50, 29, 35, 11, 78, 64, 89, 67] Output 1 Points (ascending)[11, 29, 35, ... Read More

In this article, let's learn how to check if a JSON object has any values or not in Java. If you don't know about JSON, refer JSON. We will use the org.json library and its methods like isEmpty(), length(), and keys() to check if a JSON object is empty or not. We can check if a JSON object is empty or not using the following methods: Using isEmpty() method Using length() method Using keys() method Let's see how to use each of them one by one. ... Read More

We often need to extract values from a JSON object. In this article, we will learn how to get the values of the different types from a JSON object in Java. What is JSONObject? Java JSONObject is a class in the org.json package that represents a JSON object. Refer JSONObject for more information. Let's see the steps to get the values of different types from a JSON object in Java. Getting different values from a JSON object Before we start, let's add the required library to our program. We can add a .jar file, or we can use a Maven ... Read More