The hour of the day for a particular LocalDateTime can be obtained using the getHour() method in the LocalDateTime class in Java. This method requires no parameters and it returns the hour of the day which can range from 0 to 23.A program that demonstrates this is given as follows ... Read More

Create a LinkedHashSet −LinkedHashSetset = new LinkedHashSet();Now, add elements to the Set −set.add(20); set.add(60); set.add(80); set.add(120); set.add(150); set.add(200);For removing the elements −set.remove(150); set.remove(260);Above process of insertion and deletion won’t affect the insertion order.Example Live Demoimport java.util.LinkedHashSet; public class Demo {    public static void main(String[] args) {       LinkedHashSetset ... Read More

To find strings beginning with a number, use Regular Expressions. Let us first create a table −mysql> create table DemoTable (    Id varchar(200) ); Query OK, 0 rows affected (0.59 sec)Insert records in the table using insert command −mysql> insert into DemoTable values('123User'); Query OK, 1 row affected (0.22 ... Read More

The method java.io.InputStream.close() is used to close this input stream and release any system resources associated with the stream. This method requires no parameters and returns no value. Also, the IOException is thrown when an I/O error occurs.A program that demonstrates this is given as follows −Example Live Demoimport java.io.FileInputStream; import ... Read More

A buffer can be compared with another buffer using the method compareTo() in the class java.nio.CharBuffer. This method returns a negative integer if the buffer is less than the given buffer, zero if the buffer is equal to the given buffer and a positive integer if the buffer is greater ... Read More

Selective repeat protocol, also called Selective Repeat ARQ (Automatic Repeat reQuest), is a data link layer protocol that uses sliding window method for reliable delivery of data frames. Here, only the erroneous or lost frames are retransmitted, while the good frames are received and buffered.It uses two windows of equal ... Read More

The method java.io.InputStream.read() is used to read the next byte of data from the input stream. This method requires no parameters and it returns the next data byte in the form of int. If the stream end is reached, it returns -1.A program that demonstrates this is given as follows ... Read More

To create a new list with values from existing list with Lambda Expressions, the following is an example.Here, we are displaying the name of Employees. Therefore, we have created an Employee class as well −Listemp = Arrays.asList(new Employee("Jack", 29, "South"), new Employee("Tom", 24, "North"), new Employee("Harry", 35, "West"), new Employee("Katie", ... Read More

The syntax is as follows to perform UPDATE using IF condition in MySQL −update yourTableName set yourColumnName =if(yourColumnName =yourOldValue, yourNewValue, yourColumnName);To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table updateIfConditionDemo    -> (    -> UserId int ... Read More

Initialization vector can be done in many ways1) Initialize a vector by push_back() methodAlgorithmBegin    Declare v of vector type.    Call push_back() function to insert values into vector v.    Print “Vector elements:”.    for (int a : v)       print all the elements of variable a. ... Read More