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Articles on Trending Technologies
Technical articles with clear explanations and examples
SecureRandom generateSeed() method in Java
The number of seed bytes can be obtained using the method generateSeed() in class java.security.SecureRandom. This method requires a single parameter i.e. the number of seed bytes and it returns the seed bytes that are generated.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG"); byte[] arrB = sRandom.generateSeed(5); System.out.println("The seed bytes generated are: " + Arrays.toString(arrB)); } catch (NoSuchAlgorithmException e) { ...
Read MoreIntStream range() method in Java
The range() method in the IntStream class in Java is used to return a sequential ordered IntStream from startInclusive to endExclusive by an incremental step of 1. This includes the startInclusive as well.The syntax is as follows −static IntStream range(int startInclusive, int endExclusive)Here, the parameter startInclusive includes the starting value, whereas endExclusive excludes the last valueTo work with the IntStream class in Java, import the following package −import java.util.stream.IntStream;Create an IntStream and add stream elements in a range using range() method. This returns a sequential ordered IntStream by an incremental step of 1 within the range −intStream.forEach(System.out::println);The following is an ...
Read MoreDoubleStream mapToLong() method in Java
The mapToLong() method of the DoubleStream class returns a LongStream consisting of the results of applying the given function to the elements of this stream.The syntax is as followsLongStream mapToLong(DoubleToLongFunction mapper)Here, the parameter mapper is a stateless function to apply to each element. The DoubleToLongFunction here is a function that accepts a double-valued argument and produces a long-valued result.To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create a DoubleStream and add some elementsDoubleStream doubleStream = DoubleStream.of(30.5, 45.8, 89.3);Now, use the LongStream and set a condition for the stream elementsLongStream longStream = doubleStream.mapToLong(a -> (long)a); The following is ...
Read MoreJava Program to sort a List in case insensitive order
Let’s say your list is having the following elements −P, W, g, K, H, t, ETherefore, case sensitive order means, capital and small letters will be considered irrespective of case. The output would be −E, g, H, K, P, t, WThe following is our array −String[] arr = new String[] { "P", "W", "g", "K", "H", "t", "E" };Convert the above array to a List −Listlist = Arrays.asList(arr);Now sort the above list in case insensitive order −Collections.sort(list, String.CASE_INSENSITIVE_ORDER);Exampleimport java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String[] argv) throws Exception { String[] ...
Read MoreC++ Program to Implement the RSA Algorithm
RSA is an asymmetric cryptography algorithm which works on two keys-public key and private key.AlgorithmsBegin 1. Choose two prime numbers p and q. 2. Compute n = p*q. 3. Calculate phi = (p-1) * (q-1). 4. Choose an integer e such that 1 < e < phi(n) and gcd(e, phi(n)) = 1; i.e., e and phi(n) are coprime. 5. Calculate d as d ≡ e−1 (mod phi(n)); here, d is the modular multiplicative inverse of e modulo phi(n). 6. For encryption, c = me mod n, where m = original message. 7. For ...
Read MoreSecureRandom getAlgorithm() method in Java
The name of the algorithm for the SecureRandom object can be obtained using the method getAlgorithm() in the class java.security.SecureRandom. This method requires no parameters and it returns the name of the algorithm for the SecureRandom object.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG"); String algorithmName = sRandom.getAlgorithm(); System.out.println("The Algorithm is: " + algorithmName); } catch (NoSuchAlgorithmException e) { ...
Read MoreJava Program to remove an element from List with ListIterator
Let’s say the following is our List with elements −ArrayList < String > arrList = new ArrayList < String > (); arrList.add("Jack"); arrList.add("Tom"); arrList.add("Brad"); arrList.add("Amy"); arrList.add("Ben"); arrList.add("Peter"); arrList.add("Katie"); arrList.add("Tim");Now, use the listIterator(). The next() method returns the next element in the List. Hoverer, remove an element using remove() method −ListIteratoriterator = arrList.listIterator(); iterator.next(); iterator.remove();Exampleimport java.util.ArrayList; import java.util.ListIterator; public class Demo { public static void main(String[] args) { ArrayListarrList = new ArrayList(); arrList.add("Jack"); arrList.add("Tom"); arrList.add("Brad"); arrList.add("Amy"); arrList.add("Ben"); arrList.add("Peter"); ...
Read MoreIntStream rangeClosed() method in Java
The rangeClosed() class in the IntStream class returns a sequential ordered IntStream from startInclusive to endInclusive by an incremental step of 1. This includes both the startInclusive and endInclusive values.The syntax is as followsstatic IntStream rangeClosed(int startInclusive, int endInclusive)Here, startInclusive is the value including the first value and endInclusive is the value indicating the last value. To work with the IntStream class in Java, import the following packageimport java.util.stream.IntStream;The following is an example to implement IntStream rangeClosed() method in JavaExampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { ...
Read MoreDoubleStream mapToObj() method in Java
The mapToObj() method of the DoubleStream class returns an object-valued Stream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows − Stream mapToObj(DoubleFunction
Read MoreInitializer for final static field in Java
The final static field variable is a constant variable. There is only one copy of this variable available. It is mandatory to initialize the final static field variable explicitly as the default value for it is not provided by the JVM. Also, this variable cannot be reinitialized.A program that initializes the final static field variable using a static initialization block is given as follows:Examplepublic class Demo { final static int num; static { System.out.println("Running static initialization block."); num = 6; } public static void main(String[] args) { ...
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