Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Let us create a list first with string elements. Some of the elements are null in the List:List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk");Now, sort the above list and place nulls in the end with nullsLast:list.sort(Comparator.nullsLast(String::compareTo));The following is an example to sort a list placing nulls in the end:Exampleimport java.util.Arrays; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String... args) { List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk"); System.out.println("Initial List = "+list); list.sort(Comparator.nullsLast(String::compareTo)); System.out.println("List placing nulls ... Read More
Here we will see how to initialize the const type member variable using constructor?To initialize the const value using constructor, we have to use the initialize list. This initializer list is used to initialize the data member of a class. The list of members, that will be initialized, will be present after the constructor after colon. members will be separated using comma.Example#include using namespace std; class MyClass{ private: const int x; public: MyClass(int a) : x(a){ //constructor } void show_x(){ cout
The getTableTypes() method of the DatabaseMetadata interface is used to find out the type of tables supported by the underlying database.This method returns a ResultSet object holding the names of table types in each row in String format, under the column TABLE_TYPE.To get the description DatabaseMetadata object.Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, ... Read More
Let’s say, here we are incrementing StudentScores for MongoDB which is inside StudentDetails −... "StudentScores": { ... "StudentMathScore": 90, ... "StudentMongoDBScore": 78 ... }Let us first create a collection with documents −> db.embeddedValueIncrementDemo.insertOne( ... { ... "StudentDetails": { ... "StudentScores": { ... "StudentMathScore": 90, ... "StudentMongoDBScore": 78 ... } ... } ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cd2b670345990cee87fd896") }Following is the query to display ... Read More
With echo char, you can set a character that would appear whenever a user will type the password in the JPasswordField.Let us first create a new JPassword field −JPasswordField passwd = new JPasswordField();Now, use the setEchoChar() to set the echo char for password field. Here, we have asterisk (*) as the field for password −passwd.setEchoChar('*');The following is an example to set echo char for password field −Examplepackage my; import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new ... Read More
Use the JOptionPane.showInputDialog() to get input from user in a dialog box like “Which sports you play the most”, “What is your name”, etc. The following is an example to create input Pop-Ups (Dialog) and get input from user −Examplepackage my; import javax.swing.JOptionPane; public class SwingDemo { public static void main(String[] args) { String[] sports = { "Football", "Cricket", "Squash", "Baseball", "Fencing", "Volleyball", "Basketball" }; String res = (String) JOptionPane.showInputDialog(null, "Which sports you play the most?", "Sports", JOptionPane.PLAIN_MESSAGE, null, sports, sports[0]); switch (res) { ... Read More
The $gt is for greater than, wherein select those documents where the value of the field is greater than the specified value. Let us first create a collection with documents −> db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":1000, "PlayerLevel":2}, "PlayerName":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7eba41a844af18acdffa9") } > db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":0, "PlayerLevel":1}, "PlayerName":"Robert"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7ebbb1a844af18acdffaa") } > db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":-10, "PlayerLevel":0}, "PlayerName":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7ebd41a844af18acdffab") } > db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":1, "PlayerLevel":1}, "PlayerName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7ebe31a844af18acdffac") }Following is the query to display all documents from a collection with the help of ... Read More
This is the program to find closest pair of points in an array.AlgorithmsFor Distance between Closest pointBegin Declare function Closest_dist_Spoint(poi stp[], int s, double dist, poi &pnt1, poi &pnt2) to the double datatype. Declare Minimum to the double datatype. Initialize Minimum = dist. for (int i = 0; i < s; ++i) for (int j = i+1; j < s && (stp[j].poi2 - stp[i].poi2) < Minimum; ++j) if (Distance(stp[i], stp[j]) < Minimum) then Minimum = Distance(stp[i], stp[j]). ... Read More
Whenever you inherit a superclass a copy of superclass’s members is created at the subclass and you using its object you can access the superclass members.If the superclass and the subclass have instance variable of same name, if you access it using the subclass object, the instance variables of the subclass hides the instance variables of the superclass irrespective of the types. This mechanism is known as field hiding or, instance variable hiding.But, since it makes code complicated field hiding is not recommended.ExampleIn the following example we have two classes Super and Sub one extending the other. They both have ... Read More
The HTML DOM Input Checkbox Object represents an input HTML element with type checkbox.SyntaxFollowing is the syntax −Creating an with type checkboxvar checkboxObject = document.createElement(“input”); checkboxObject.type = “checkbox”;AttributesHere, “checkboxObject” can have the following attributes −AttributesDescriptionautofocusIt defines if the checkbox should be focused on initial page load.checkedIt defines the state of checkbox i.e. checked/unchecked.defaultCheckedIt returns the default value of checked attribute i.e. true/falsedefaultValueIt sets/returns the default value of checkboxdisabledIt defines if checkbox is disabled/enabledformIt returns a reference of enclosing form that contains the checkboxindeterminateIt sets/returns indeterminate state of checkboxnameIt defines the value of name attribute of a checkboxrequiredIt defines if ... Read More
To Continue Learning Please Login