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Articles by Daniol Thomas
Page 12 of 13
IntStream mapToObj() method in Java
The mapToObj() method in the IntStream 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. StreammapToObj(IntFunction
Read MoreIntStream mapToLong() method in Java
The mapToLong() function in IntStream class returns a LongStream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows.LongStream mapToLong(IntToLongFunction mapper)Here, the parameter mapper is a stateless function to apply to each element.Create an IntStream with some elements in the Stream.IntStream intStream = IntStream.of(50, 100, 150, 200);Now create a LongStream and use the mapToLong() with a condition.LongStream longStream = intStream.mapToLong(num → (long)num);The following is an example to implement IntStream mapToLong() method in Java.Exampleimport java.util.*; import java.util.stream.IntStream; import java.util.stream.LongStream; public class Demo { public static void main(String[] args) { ...
Read MoreWhat is type3 driver of JDBC what are the advantages and disadvantages of it?
In a Type 3 driver, a three-tier approach is used to access databases. The JDBC clients use standard network sockets to communicate with a middleware application server. The socket information is then translated by the middleware application server into the call format required by the DBMS, and forwarded to the database server.This kind of driver is extremely flexible, since it requires no code installed on the client, a single driver can actually provide access to multiple databases. You can think of the application server as a JDBC "proxy, " meaning that it makes calls for the client application. As a ...
Read MoreWhat are the main classes and interfaces of JDBC?
JDBC API is available in two packages java.sql, core API and javax.sql JDBC optional packages. Following are the important classes and interfaces of JDBC.Class/interfaceDescriptionDriverManagerThis class manages the JDBC drivers. You need to register your drivers to this.It provides methods such as registerDriver() and getConnection().DriverThis interface is the Base interface for every driver class i.e. If you want to create a JDBC Driver of your own you need to implement this interface. If you load a Driver class (implementation of this interface), it will create an instance of itself and register with the driver manager.StatementThis interface represents a static SQL statement. ...
Read MoreWhat are the types of statements in JDBC?
There are three types of statements in JDBC namely, Statement, Prepared Statement, Callable statement.StatementThe Statement interface represents the static SQL statement. It helps you to create a general purpose SQL statements using Java.Creating a statementYou can create an object of this interface using the createStatement() method of the Connection interface.Create a statement by invoking the createStatement() method as shown below.Statement stmt = null; try { stmt = conn.createStatement( ); . . . } catch (SQLException e) { . . . } finally { . . . }Executing the ...
Read MoreLongStream map() method in Java
The map() method of the LongStream class in Java returns a stream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows:LongStream map(LongUnaryOperator mapper)Here, the parameter mapper is a stateless function to apply to each element. The LongUnaryOperator represents an operation on a single long-valued operand that produces a long-valued result.To use the LongStream class in Java, import the following package:import java.util.stream.LongStream;Create a LongStream and add some elements:LongStream longStream1 = LongStream.of(15L, 30L, 45L, 67L, 80L);Now, create another LongStream and map it to a condition set for the elements of longStream1:LongStream longStream2 ...
Read MoreWhat are bind variables? How to execute a query with bind variables using JDBC?
A bind variable is an SQL statement with a temporary variable as place holders which are later replaced with appropriate values. For example, if you have a table named employee in the database created as shown below:+---------+--------+----------------+ | Name | Salary | Location | +---------+--------+----------------+ | Amit | 30000 | Hyderabad | | Kalyan | 40000 | Vishakhapatnam | | Renuka | 50000 | Delhi | | Archana | ...
Read MoreHow to write a JDBC program to extract data from multiple databases?
To connect with a data base, you need toRegister the DriverSelect the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connectionCreate a connection object by passing the URL of the database, username and password of a user in the database (in string format) as parameters to the getConnection() method of the DriverManager class.Connection mysqlCon = DriverManager.getConnection(mysqlUrl, "root", "password");And, to extract data you need to execute the select query as:ResultSet rs = stmt.executeQuery("Select * from Employee");To print the contents of the ...
Read MoreC++ Program to Perform Greedy Coloring
Here is a C++ Program to Perform Greedy ColoringAlgorithm:Begin Take the number of vertices and edges as input. Create function greedyColoring() to assign color to vertices: A) Assign the first color to first vertex. B) Initialize the remaining vertices. C) Declare a temporary array to store the available colors. D) Assign color to the remaining vertices. Print the solution. EndExample Code#include #include using namespace std; int n,e,i,j; vector g; vector col; bool visit[1001]; void greedyColoring() { col[0] = 0; for (i=1;i
Read MoreC++ Program to Perform Operations in a BST
A Binary Search Tree is a sorted binary tree in which all the nodes will have following properties−The right sub-tree of a node has a key greater than to its parent node's key.The left sub-tree of a node has a key lesser than to its parent node's key.All key values are distinct.Each node cannot have more than two children.Class Descriptions:Begin class BST to declare following functions: search() = To search an item in BST. initialize temp = root; while(temp != NULL) Increase ...
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