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It can be checked if a ChronoUnit is supported by the Instant class or not by using the isSupported() method in the Instant class in Java. This method requires a single parameter i.e. the ChronoUnit to check. It returns true if the ChronoUnit is supported by the Instant class and false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; import java.time.temporal.ChronoUnit; public class Demo { public static void main(String[] args) { Instant i = Instant.now(); System.out.println("The current instant is: " + i); boolean flag = i.isSupported(ChronoUnit.SECONDS); ... Read More
The add() method of the StringJoiner class is used in Java 8 to add a copy of the given CharSequence value as the next element of the StringJoiner value. If the new element ele is null, then the value null gets added.The syntax is as follows −public StringJoiner add(CharSequence ele)Here, the parameter ele is the element to be added, whereas, CharSequence is a readable sequence of char values.To work with the StringJoiner in Java 8, import the following package −import java.util.StringJoiner;We will first create a StringJoiner and set the delimeter −StringJoiner strJoin = new StringJoiner(", ")Use the add() method to ... Read More
To delete all rows older than 5 days, you can use the following syntax −delete from yourTableName where datediff(now(), yourTableName.yourDateColumnName) > 5;Note − Let’s say the current date is 2019-03-10.To understand the concept, let us create a table. The query to create a table is as follows −mysql> create table deleteRowsOlderThan5Demo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Post_Date date -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into deleteRowsOlderThan5Demo(Name, Post_Date) ... Read More
A class constructor is a special member function of a class that is executed whenever we create new objects of that class.A constructor will have exact same name as the class and it does not have any return type at all, not even void. Constructors can be very useful for setting initial values for certain member variables.Following example explains the concept of constructor −Example Live Demo#include using namespace std; class Line { public: void setLength( double len ); double getLength( void ); Line(); // This is the constructor private: double length; }; // Member functions definitions including constructor Line::Line(void) { cout
To iterate over all MongoDB databases, you need to switch your database to admin. Following is the query to switch to admin and get information about all the databases> switchDatabaseAdmin = db.getSiblingDB("admin"); admin > allDatabaseName = switchDatabaseAdmin.runCommand({ "listDatabases": 1 }).databases;This will produce the following output[ { "name" : "admin", "sizeOnDisk" : 495616, "empty" : false }, { "name" : "config", "sizeOnDisk" : 98304, "empty" : false }, { "name" : "local", "sizeOnDisk" : 73728, "empty" : false }, { "name" : "sample", "sizeOnDisk" : 1335296, "empty" : false }, { "name" : "sampleDemo", "sizeOnDisk" : 278528, "empty" : false }, { "name" : "studentSearch", "sizeOnDisk" : 262144, "empty" : false }, { "name" : "test", "sizeOnDisk" : 8724480, "empty" : false } ]
A complete graph is a graph which has a connecting edge between any pair of vertices. This is a C++ Program to Perform Edge Coloring on Complete Graph.AlgorithmBegin Take the input of the number of vertices ‘n’. Construct a complete graph using e=n*(n-1)/2 edges, in ed[][]. Function EdgeColor() is used to Color the graph edges. A) Assign color to current edge as c i.e. 1 initially. B) If the same color is occupied by any of the adjacent edges, then discard this color and go to flag again and try next color. ... Read More
Weakly or Strongly Connected for a given a directed graph can be found out using DFS. This is a C++ program of this problem.Functions usedBegin Function fillorder() = fill stack with all the vertices. a) Mark the current node as visited and print it b) Recur for all the vertices adjacent to this vertex c) All vertices reachable from v are processed by now, push v to Stack End Begin Function DFS() : a) Mark the current node as visited and print it b) Recur for all the vertices adjacent to this vertex EndExample#include ... Read More
A buffer can be compared with another buffer using the method compareTo() in the class java.nio.ByteBuffer. 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 than the given buffer.A program that demonstrates this is given as follows −Example Live Demoimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { ByteBuffer buffer1 = ByteBuffer.allocate(n); ... Read More
An immutable copy of a duration where some minutes are removed from it can be obtained using the minusMinutes() method in the Duration class in Java. This method requires a single parameter i.e. the number of minutes to be subtracted and it returns the duration with the subtracted minutes.A program that demonstrates this is given as follows −Example Live Demoimport java.time.Duration; public class Demo { public static void main(String[] args) { Duration d = Duration.ofMinutes(60); System.out.println("The duration is: " + d); ... Read More
The addAtX() method is used to add value to the Triplet Tuple. The index can be set here with the X i.e. the place where the value gets added.Let us first see what we need to work with JavaTuples. To work with Triplet class in JavaTuples, you need to import the following package −import org.javatuples.Triplet;Here, we have used Quartet class also, therefore import the following −import org.javatuples.Quartet;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Triplet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add External ... Read More