To format and display date like this i.e. Day/Month/Year, you need to set the pattern:dd/MM/yyyyAt first, set a LocalDate:LocalDate localDate = LocalDate.now();Now format and display date as '12/04/2019':localDate.format(DateTimeFormatter.ofPattern("dd/MM/yyyy"))Exampleimport java.time.LocalDate; import java.time.format.DateTimeFormatter; public class Demo {    public static void main(String[] args) {       LocalDate date = LocalDate.now();       System.out.println("Date = "+date);       DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");       System.out.println("Formatted Date = "+date.format(formatter));    } }OutputDate = 2019-04-12 Formatted Date = 12/04/2019

To format and display date like this i.e. YearMonth, you need to set the pattern:uuuuMMAt first, set a LocalDate:LocalDate localDate = LocalDate.now();Now format and display date as ‘201904’:localDate.format(DateTimeFormatter.ofPattern("uuuuMM"))Exampleimport java.time.LocalDate; import java.time.format.DateTimeFormatter; public class Demo {    public static void main(String[] args) {       LocalDate localDate = LocalDate.now();       System.out.println("Date = "+localDate);       System.out.println("Date (Year and Month) = "+localDate.format(DateTimeFormatter.ofPattern("uuuuMM")));    } }OutputDate = 2019-04-19 Date (Year and Month) = 201904

In this article, we will learn to convert milliseconds to readable strings in Java. Converting milliseconds into a human-readable format such as hours, minutes, seconds, and milliseconds is a common programming task, especially in time-sensitive applications. Problem Statement The challenge is to convert a given time in milliseconds into a readable string that shows hours, minutes, seconds, and remaining milliseconds. Input long millis = 5000000; Output  Hours = 1 Minutes = 23 Seconds = 20Milliseconds = 0 1 hr(s) 23 min(s) 20 sec(s) 0 ms Approaches to convert millisecond to readable string Following are the two different approaches to converting milliseconds ... Read More

At first set a LocalDateTime:LocalDate date = LocalDate.now(); LocalTime time = LocalTime.now(); LocalDateTime dateTime = LocalDateTime.of(date, time);Now, convert the LocalDateTime to LocalDate and LocalTime:LocalDate localDate = LocalDateTime.now().toLocalDate(); LocalTime localTime = LocalDateTime.now().toLocalTime();Exampleimport java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; public class Demo {    public static void main(String[] args) {       LocalDate date = LocalDate.now();       LocalTime time = LocalTime.now();       LocalDateTime dateTime = LocalDateTime.of(date, time);       System.out.println("DateTime = "+dateTime);       LocalDate localDate = LocalDateTime.now().toLocalDate();       LocalTime localTime = LocalDateTime.now().toLocalTime();       System.out.println("Date = "+localDate);       System.out.println("Time = ... Read More

Let us first create a TreeSet and add elements to it:TreeSet treeSet = new TreeSet(); treeSet.add(20); treeSet.add(50); treeSet.add(100); treeSet.add(120); treeSet.add(150); treeSet.add(200); treeSet.add(250); treeSet.add(300); treeSet.add(350); treeSet.add(400);Now, let us get Tail Set from the TreeSet. In the below case, we will get elements above 200:SortedSet set = treeSet.tailSet(200);Exampleimport java.util.SortedSet; import java.util.TreeSet; public class Demo {    public static void main(String[] args) {       TreeSet treeSet = new TreeSet();       treeSet.add(20);       treeSet.add(50);       treeSet.add(100);       treeSet.add(120);       treeSet.add(150);       treeSet.add(200);       treeSet.add(250);       treeSet.add(300); ... Read More

Let us first create a TreeSet and add elements:TreeSet treeSet = new TreeSet(); treeSet.add(10); treeSet.add(20); treeSet.add(30); treeSet.add(40); treeSet.add(50); treeSet.add(60); treeSet.add(70); treeSet.add(80); treeSet.add(90); treeSet.add(100);Now, let’s say you need to set sub set from 50 to 70, then use the subset() for it:SortedSet sub = treeSet.subSet(50, 70); System.out.println("Sub Set = " + sub);Exampleimport java.util.TreeSet; import java.util.SortedSet; public class Demo {    public static void main(String[] args) {       TreeSet treeSet = new TreeSet();       treeSet.add(10);       treeSet.add(20);       treeSet.add(30);       treeSet.add(40);       treeSet.add(50);       treeSet.add(60);       ... Read More

Let us first create an int array −int[] arr = new int[10];Now, fill array values. Here, the numbers get added from the index 2 to 7 −Arrays.fill(arr, 2, 7, 100);Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] args) {       int[] arr = new int[10];       System.out.println("Array = "+Arrays.toString(arr));       Arrays.fill(arr, 2, 7, 100);       System.out.println("Fill = "+Arrays.toString(arr));    } }OutputArray = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] Fill = [0, 0, 100, 100, 100, 100, 100, 0, 0, 0]

Let us first crate an array −double[] arr = new double[5];Now, create Random class object −Random randNum = new Random();Now, fill the above array with random numbers −for (int i = 0; i < 5; i++) { arr[i] = randNum.nextInt(); }Example Live Demoimport java.util.Arrays; import java.util.Random; public class Demo {    public static void main(String args[]) {       double[] arr = new double[5];       Random randNum = new Random();       for (int i = 0; i < 5; i++) {          arr[i] = randNum.nextInt();       }       System.out.println("Random numbers = "+Arrays.toString(arr));    } }OutputRandom numbers = [-6.59888981E8, 1.141160731E9, -9.931249E8, 1.335266582E9, 8.27918412E8]

What Is Left Shifting in an Array? Shifting the array elements to the left by the given number of positions is also known as left rotation of the array. The element at the beginning gets pushed out of the front during the shift, but instead of being deleted, they are re-attached at the end of the array. Let us consider an example for a better understanding: Original Array: After 1 Left Shift: We can see in the above figure that, after the first shift, the element "1" is pushed out and then reattached at the end of the ... Read More

Create a Random class object −Random random = new Random();Now let us create a random BigInteger within the range set below −BigInteger i = new BigInteger(1024, random);Example Live Demoimport java.math.BigInteger; import java.util.Random; public class Demo {    public static void main(String[] args) {       Random random = new Random();       BigInteger i = new BigInteger(1024, random);       System.out.println("Random BigInteger = "+i);    } }OutputRandom BigInteger = 172988250696765715389833755481951104504569480256142363412177847577736195982554760981595486734850686498607899498518922990162874103419942352546847073039976287403845518172884710426458735414702299598858093908453406020426533304237452347610248118892069951238970445771615614781904759399589093691142208659284351662649