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Java Articles
Page 366 of 450
Ints contains() function in Java
The contains() function of the Ints class is used to check whether an element is present in the array or not.Following is the syntax −public static boolean contains(int[] arr, int target)Here, arr is the array wherein the element is to be checked. The target is the element to be checked.Following is an example to implement the contains() method of the Ints class −Exampleimport com.google.common.primitives.Ints; import java.util.*; class Demo { public static void main(String[] args) { int[] myArr1 = { 100, 150, 230, 300, 400 }; int[] myArr2 = { 450, 550, 700, 800, ...
Read MoreInts concat() function in Java
The concat() function in Ints class is used to concatenate the arrays passed as parameter. The syntax is as follows −public static int[] concat(int[]... arr)Here, parameter arr is zero or more integer arrays.Let us see an example −Exampleimport com.google.common.primitives.Ints; import java.util.*; class Demo { public static void main(String[] args) { int[] myArr1 = { 100, 150, 230, 300, 400 }; int[] myArr2 = { 450, 550, 700, 800, 1000 }; System.out.println("Array 1 = "); for(int i=0; i < myArr1.length; i++) { System.out.println(myArr1[i]); ...
Read MoreJava Signature toString() method with Examples
The string representation for the signature object can be obtained using the method getString() in the class java.security.Signature. This includes information such as the object state, algorithm name etcLet 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"); String str = signature.toString(); System.out.println(str); } catch (NoSuchAlgorithmException e) { System.out.println("Error!!! NoSuchAlgorithmException"); } } }OutputSignature object: SHA256withRSALet us now ...
Read MoreJava Signature initSign() method with Examples
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[]) throws Exception { //Creating KeyPair generator object KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DSA"); //Initializing the key pair generator keyPairGen.initialize(2048); //Generate the pair of keys KeyPair pair = keyPairGen.generateKeyPair(); //Getting the privatekey ...
Read MoreJava Signature getProvider() method with Examples
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"); Provider provider = signature.getProvider(); System.out.println("The Provider is: " + provider); } catch (NoSuchAlgorithmException e) { System.out.println("Error!!! NoSuchAlgorithmException"); } } }OutputThe Provider is: SunRsaSign version 11ExampleLet us now see another example −import ...
Read MoreThe abstract keyword in Java
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 use an abstract class, you have to inherit it from another class, provide implementations to the abstract methods in it. If you inherit an abstract class, you have to provide implementations to all the abstract methods in it.Let us see a simple example −Exampleabstract class CricketLeague { abstract void ...
Read MoreJava Signature getInstance() method with Examples
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 { Signature signature = Signature.getInstance("SHA256withRSA"); String str = signature.toString(); System.out.println(str); } catch (NoSuchAlgorithmException e) { System.out.println("Error!!! NoSuchAlgorithmException"); } } }OutputSignature object: SHA256withRSALet us now see another example −Exampleimport java.security.*; import java.util.*; public ...
Read MoreJava Signature getAlgorithm() method with Examples
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 signature = Signature.getInstance("SHA256withRSA"); String algorithm = signature.getAlgorithm(); System.out.println("The Algorithm = " + algorithm); } catch (NoSuchAlgorithmException e) { System.out.println("Error!! NoSuchAlgorithmException"); } } }OutputThe Algorithm = SHA256withRSALet us now see another example ...
Read MoreLog functions in Java
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 class Main { public static void main(String args[]) { // get two double numbers double x = 60984.1; double y = -497.99; // get the natural logarithm for x System.out.println("Math.log(" + x + ")=" ...
Read MoreThe new operator in Java
The new operator is used in Java to create new objects. It can also be used to create an array object.Let us first see the steps when creating an object from a class −Declaration − A variable declaration with a variable name with an object type.Instantiation − The 'new' keyword is used to create the object.Initialization − The 'new' keyword is followed by a call to a constructor. This call initializes the new object.Now, let us see an example −Examplepublic class Puppy { public Puppy(String name) { // This constructor has one parameter, name. ...
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