Elements can be filled in an int array using the java.util.Arrays.fill() method. This method assigns the required int value to the int array in Java. The two parameters required are the array name and the value that is to be stored in the array elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] argv) throws Exception {       int[] intArray = new int[5];       int intValue = 9;       Arrays.fill(intArray, intValue);       System.out.println("The int array content is: " + Arrays.toString(intArray)); ... Read More

In order to generate Random double type numbers in Java, we use the nextDouble() method of the java.util.Random class. This returns the next random double value between 0.0 (inclusive) and 1.0 (exclusive) from the random generator sequence.Declaration - The java.util.Random.nextDouble() method is declared as follows −public float nextDouble()Let us see a program to generate random double type numbers in Java −Example Live Demoimport java.util.Random; public class Example {    public static void main(String[] args) {       Random rd = new Random(); // creating Random object       System.out.println(rd.nextDouble()); // displaying a random double value between 0.0 & 1.0   ... Read More

The methods of the java.lang.Math class can be listed using the java.lang.Class.getDeclaredMethods() method. This method returns an array that contains all the Method objects with public, private, protected and default access. However, the inherited methods are not included. Also, the getDeclaredMethods() method returns a zero length array if the class or interface has no methods or if a primitive type, array class or void is represented in the Class object.A program that demonstrates this is given as follows −Example Live Demoimport java.lang.reflect.Method; public class Demo {    public static void main(final String[] args) {       final Method[] methods = Math.class.getDeclaredMethods(); ... Read More

The methods of a class can be listed using the java.lang.Class.getDeclaredMethods() method. This method returns an array that contains all the Method objects with public, private, protected and default access. However, the inherited methods are not included.Also, the getDeclaredMethods() method returns a zero length array if the class or interface has no methods or if a primitive type, array class or void is represented in the Class object.A program that demonstrates this is given as follows −Example Live Demoimport java.lang.reflect.*; public class Demo {    public static void main(String[] args) {       Class c = Thread.class;       ... Read More

The getName() method is used to get the names of the entities such as primitive type, interface, class, array class, void etc. that represented by the class objects. These names are returned in the form of a string.A program that gets the name of a primitive type using getName() method is given as follows -Example Live Demopublic class Demo {    public static void main(String[] argv) throws Exception {       String name1 = float.class.getName();       System.out.println(name1);       String name2 = int.class.getName();       System.out.println(name2);       String name3 = char.class.getName();       ... Read More

Elements can be filled in a byte array using the java.util.Arrays.fill() method. This method assigns the required byte value to the byte array in Java. The two parameters required are the array name and the value that is to be stored in the array elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] argv) throws Exception {       byte[] byteArray = new byte[5];       byte byteValue = 5;       Arrays.fill(byteArray, byteValue);       System.out.println("The byte array content is: " + Arrays.toString(byteArray)); ... Read More

A new instance of an Array can be created using the java.lang.reflect.Array.newInstance() method. This method basically creates a new array with the required component type as well as length.A program that demonstrates the creation of an array using the Array.newInstance() method is given as follows −Example Live Demoimport java.lang.reflect.Array; public class Demo {    public static void main (String args[]) {       int arr[] = (int[])Array.newInstance(int.class, 5);       Array.set(arr, 0, 5);       Array.set(arr, 1, 1);       Array.set(arr, 2, 9);       Array.set(arr, 3, 3);       Array.set(arr, 4, 7);     ... Read More

An array can be initialized using the method java.util.Arrays.fill() that is a utility method provided in the java.util.Arrays class. This method assigns the required value to all the elements in the array or to all the elements in the specified range.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] arg) {       int[] arr = {2, 5, 8, 1, 9};       System.out.print("The array elements are: ");       for (int i = 0; i < arr.length; i++) {          System.out.print(arr[i] ... Read More

The byte array in Java can be filled by using the method java.util.Arrays.fill(). This method assigns the required byte value to the byte array in Java. The two parameters required for java.util.Arrays.fill() are the array name and the value that is to be stored in the array elements.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] a) {       byte arr[] = new byte[] {5, 1, 9, 2, 6};       System.out.print("Byte array elements are: ");       for (int num : arr) { ... Read More

To compute the elapsed time of an operation in milliseconds in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in milliseconds in Java −Example Live Demopublic class Example {    public static void main(String[] args) throws Exception {       // finding the time before the operation is executed       long ... Read More