The initSign() method initialize this object for signing. If this method is called again with a different argument, it negates the effect of this call.Let us now see an example −Exampleimport java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.Signature; import java.util.Scanner; public class Main {    public static void main(String args[]) ... Read More

The provider for the signature object can be obtained using the method getProvider() in the class java.security.Signature.Let us now see an example −Exampleimport java.security.*; import java.util.*; public class Main {    public static void main(String[] argv) {       try {          Signature signature = Signature.getInstance("SHA256withRSA"); ... Read More

A class which contains the abstract keyword in its declaration is known as abstract class. Abstract classes may or may not contain abstract methods, i.e., methods without body. But, if a class has at least one abstract method, then the class must be declared abstract.If a class is declared abstract, it cannot be instantiated. To ... Read More

HashSet extends AbstractSet and implements the Set interface. It creates a collection that uses a hash table for storage.A hash table stores information by using a mechanism called hashing. In hashing, the informational content of a key is used to determine a unique value, called its hash code.To traverse through a ... Read More

A signature object that can implement the required signature algorithm can be obtained using the method getInstance() in the class java.security.Signature.Let us now see an example −Exampleimport java.security.*; import java.util.*; public class Main {    public static void main(String[] argv) {       try {         ... Read More

The name of the algorithm for the signature object can be obtained using the method getAlgorithm() in the class java.security.Signature.Let us now see an example −Exampleimport java.security.*; import java.util.*; public class Main {    public static void main(String[] argv) {       try {          Signature ... Read More

The log functions in Java are part of java.lang.Math. The functions include log, log10, log1p. Let us see an example of each of these log functions −static double log(double a)The java.lang.Math.log(double a) returns the natural logarithm (base e) of a double value. Let us see an example −Exampleimport java.io.*; public ... Read More

The java.lang.Math class contains methods for trigonometric operations like cos(), sin(), tan(), tanh(), cosh(), atan(), etc.Let us work around some of these trigonometric functions in Java −static double asin(double a)The java.lang.Math.asin(double a) returns the arc sine of an angle, in the range of -pi/2 through pi/2.Let us now see an ... Read More

The StringTokenizer class allows an application to break a string into tokens. Following are the methods −Sr.NoMethod & Description1int countTokens()This method calculates the number of times that this tokenizer's nextToken method can be called before it generates an exception.2boolean hasMoreElements()This method returns the same value as the hasMoreTokens method.3boolean hasMoreTokens()This method tests ... Read More

The HTML DOM Textarea autofocus property returns and modify whether the text area should automatically get focused or not when the page loads.SyntaxFollowing is the syntax −1. Returning autofocusobject.autofocus2. Modifying autofocusobject.autofocus = true | falseLet us see an example of HTML DOM Textarea autofocus Property:Example    body { ... Read More