The skip() method of the DoubleStream class in Java returns a stream consisting of the remaining elements of this stream after discarding the first numEle elements of the stream. The numEle is a parameter which you can set to skip any number of elements from the stream.The syntax is as follows −DoubleStream skip(long numEle)Here, numEle is the number of elements to skip. The leading elements are skipped.To use the DoubleStream class in Java, import the following package −import java.util.stream.DoubleStream;The following is an example to implement DoubleStream skip() method in Java −Example Live Demoimport java.util.stream.DoubleStream; public class Demo { ... Read More

The AbstractSequentialList class provides an implementation of the List interface. For an unmodifiable list, implement the list iterator's hasNext, next, hasPrevious, previous and index methods. For a modifiable list the programmer should implement the list iterator's set method.The syntax is as followspublic abstract class AbstractSequentialList extends AbstractListTo work with the AbstractSequentialList class in Java, you need to import the following packageimport java.util.AbstractSequentialList;First, create an AbstractSequentialList classAbstractSequentialList absSequential = new LinkedList();Now, add elementsabsSequential.add("Accessories"); absSequential.add("Home Decor"); absSequential.add("Books"); bsSequential.add("Stationery");Let us see an example to implement the AbstractSequentialList class in JavaExample Live Demoimport java.util.LinkedList; import java.util.AbstractSequentialList; public class Demo {    public static void main(String[] ... Read More

To create a view only if it does not already exist, you can use the following syntax −CREATE OR REPLACE VIEW yourViewName AS SELECT *FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table createViewDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into createViewDemo(Name) values('John'); Query OK, 1 row affected (0.22 sec) mysql> insert into ... Read More

Details about the zombie, orphan and daemon processes are given as followsZombie ProcessesA zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child’s exit status. Once this is done using the wait system call, the zombie process is eliminated from the process table. This is known as reaping the zombie process.A diagram that demonstrates the creation and termination of a zombie process is given as followsZombie processes don't use any system resources but they ... Read More

Deleting a derived class object using a pointer to a base class, the base class should be defined with a virtual destructor.Example Code#include using namespace std; class b {    public:       b() {          cout

To find oldest/youngest post in MongoDB collection, you can use sort(). Let’s say you have a document with a field “UserPostDate” and you need to get the oldest and youngest post. For that, Let us first create a collection with documents>db.getOldestAndYoungestPostDemo.insertOne({"UserId":"Larry@123", "UserName":"Larry", "UserPostDate":new ISODate('2019-03-27 12:00:00')}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c9a700f15e86fd1496b38ab") } >db.getOldestAndYoungestPostDemo.insertOne({"UserId":"Sam@897", "UserName":"Sam", "UserPostDate":new ISODate('2012-06-17 11:40:30')}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c9a703815e86fd1496b38ac") } >db.getOldestAndYoungestPostDemo.insertOne({"UserId":"David@777", "UserName":"David", "UserPostDate":new ISODate('2018-01-31 10:45:35')}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c9a705e15e86fd1496b38ad") } >db.getOldestAndYoungestPostDemo.insertOne({"UserId":"Chris@909", "UserName":"Chris", "UserPostDate":new ISODate('2017-04-14 04:12:04')}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c9a708915e86fd1496b38ae") }Following ... Read More

We have considered a number 10 here, which will divided into 8 random ints with Random class. The number we have set as HashSet collection −HashSetset = new HashSet(); set.add(0); set.add(0); set.add(0); set.add(number);Now use nextInt to get the next random integer −intarrSize = parts + 1; while (set.size() < arrSize) {    set.add(1 + randNum.nextInt(number - 1)); } Integer[] dividers = set.toArray(new Integer[arrSize]); Arrays.sort(dividers); int[] res = new int[parts]; for(int i = 1, j = 0; i < dividers.length; ++i, ++j) {    res[j] = dividers[i] - dividers[j]; }Example Live Demoimport java.util.Arrays; import java.util.HashSet; import java.util.Random; public class Demo {   ... Read More

You can use INFORMATION_SCHEMA.COLUMNS for this. Following is the syntax −SELECT COLUMN_NAME, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='yourTableName';Let us first create a table −mysql> create table DemoTable    (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ClientName varchar(60),    ClientAge int,    ClientSalary DECIMAL(10, 4),    isRegularClient bool    ); Query OK, 0 rows affected (0.44 sec)Following is the query to get field name types from a SQL database −mysql> SELECT COLUMN_NAME, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='DemoTable';This will produce the following output −+-----------------+---------------+ | COLUMN_NAME | COLUMN_TYPE | +-----------------+---------------+ | Id ... Read More

At first let us discuss about the rand() function. rand() function is a predefined method of C++. It is declared in header file. rand() is used to generate random number within a range. Here min_n is the minimum range of the random numbers and max_n is the maximum range of the numbers. So rand() will return the random numbers between min_n to (max_n – 1) inclusive of the limit values. Here if we mention lower and upper limits as 1 and 100 respectively, then rand() will return values from 1 to (100 – 1). i.e. from 1 to 99.AlgorithmBegin ... Read More

To select part of a timestamp in a query, you need to use YEAR() function. The syntax is as follows in MySQL.select YEAR(yourTimestampColumnName) as anyAliasName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table SelectPartOfTimestampDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ShippingTime TIMESTAMP -> ); Query OK, 0 rows affected (1.11 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> ... Read More