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

Two byte arrays can be compared in Java using the java.util.Arrays.equals() method. This method returns true if the arrays are equal and false otherwise. The two arrays are equal if they contain the same number of elements in the same order. A program that compares two byte arrays using the Arrays.equals() method is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String[] argv) throws Exception {       boolean flag = Arrays.equals(new byte[] { 1, 7, 5 }, new byte[] { 1, 7, 5 });       System.out.println("The two byte arrays are ... Read More

A multi-dimensional array can be easily printed using java.util.Arrays.deepToString() in Java. This method converts the multi-dimensional array to string and prints the array contents enclosed in square brackets. What Are Multi-Dimensional Arrays? Multi-dimensional arrays allow you to store data in a matrix-like structure, providing a way to represent tables, grids, or more complex hierarchical data. The most common type is a two-dimensional array, but Java supports arrays with more than two dimensions. int[][] array = new int[rows][columns]; Using Naive Approach The Arrays.deepToString(arr) method from the Arrays class ... Read More

An array can be sorted in case-sensitive order using the java.util.Arrays.sort() method. Only a single argument required in this case for this method i.e. the array to be sorted. A program that demonstrates this is given as follows −Example Live Demoimport java.util.Arrays; public class Demo {    public static void main(String args[]) {       String[] arr = new String[] { "apple", "mango", "Banana", "Melon", "orange" };       System.out.print("The unsorted array is: ");       System.out.println(Arrays.toString(arr));       Arrays.sort(arr);       System.out.print("The sorted array in case-sensitive order is: ");       System.out.println(Arrays.toString(arr));    } ... Read More