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Once you have installed JDK version on your windows machine, you have to set up Environment Variables.Please find below steps to set the java pathGo to My Computer ---> Right Click on it ---> Advanced System Settings ---> Advanced Tab ---> Click on Environment VariablesNow you have to alter the “Path” variable under system variables such that it contains a path to Java Environment. Select the path variable and click on the “Edit” buttonBy default, Java is installed in “C:\Program Files\Java\jre version\bin” in case you have changed the location of installation, then add that pathClick on OK button and now ... Read More
To add empty border to a component, use the BorderFactory class createEmptyBorder() method −Border emptyBorder = BorderFactory.createEmptyBorder(10, 10, 0, 0);To set the above border to a component, use the setBorder() method −JButton button = new JButton("Empty Border"); button.setBorder(emptyBorder);The following is an example to ad empty border to a JButton −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; import javax.swing.border.SoftBevelBorder; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Border raisedBorder = new SoftBevelBorder(SoftBevelBorder.RAISED, ... Read More
To create a Titleless and Borderless JFrame, use the setUndecorated() method and set it to TRUE −JFrame frame = new JFrame("Register!"); frame.setUndecorated(true);The following is an example to create a titleless and borderless JFrame −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 JFrame("Register!"); JLabel label1, label2, label3; frame.setLayout(new GridLayout(2, 2)); label1 = new JLabel("Id", SwingConstants.CENTER); label2 = new JLabel("Age", SwingConstants.CENTER); ... Read More
Use the $slice operator. Let us first create a collection with documents −> db.limitAndSliceProjectionDemo.insertOne( { "_id" : 101, "UserName" : "Carol", "UserAge" : 26, "UserMesssage" : [ "Hi", "Hello", "Bye", "Awesome", "Good", "Bad", "Nice", "Good Night", "Good Morning" ] } ); { "acknowledged" : true, "insertedId" : ... Read More
For this, you can use the DEFAULT CURRENT_TIMESTAMP clause in MySQL. Following is the syntax −CREATE TABLE yourTableName ( yourColumnName1 dataType1, yourColumnName timestamp DEFAULT CURRENT_TIMESTAMP );Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> DueDate timestamp default current_timestamp -> ); Query OK, 0 rows affected (0.86 sec)Now you can insert some records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----+---------------------+ ... Read More
The HTML DOM select remove() method removes a new option from a drop-down list in an HTML document.SyntaxFollowing is the syntax −object.remove(index)Here, index represents the index of the option which is to be removed from the drop-down list.ExampleLet us see an example of HTML DOM select remove() method − Live Demo html{ height:100%; } body{ text-align:center; color:#fff; background: radial-gradient( circle farthest-corner at 23.1% 64.6%, rgba(129, 125, 254, 1) 0%, rgba(111, 167, 254, 1) 90% ) no-repeat; height:100%; } ... Read More
As we know that the Macros are used in C or C++, but there is no facility for type checking. The macros can take any type of argument in it. The following example will show this case clearly.Example Live Demo#include #define INCREMENT(X) ++X main() { int x = 5; float y = 2.56; char z = 'A'; printf("Integer Increment: %d", INCREMENT(x)); printf("Float Increment: %f", INCREMENT(y)); printf("Character Increment: %c", INCREMENT(z)); }OutputInteger Increment: 6 Float Increment: 3.560000 Character Increment: BThat is the problem of macro. In the later version of C, we can use macro by using ‘_Generic’ keyword. ... Read More
Here we will see how to count number of objects are created from a specific class using some static member functions. The static members are class properties, not the object properties. For a single class there will be only one instance for static members. No new members are created for each objects.In this problem we are using one static counter variable to keep track the number of objects, then static member will be there to display the count value.When a new object is created, so the constructor will be called. Inside the constructor, the count value is increased. Thus we ... Read More
Here we will see how to compile multiple cpp file in C++ program. The task is very simple. We can provide the names as a list to the g++ compiler to compile them into one executable fileTo compile multiple files like abc.cpp, and xyz.cpp at once, the syntax will be like this −g++ abc.cpp xyz.cppTo run the program, we can use this −./a.outExamplefloat area(float r){ return (3.1415*r*r); //area of a circle } float area(float l, float w) { return (l * w); //area of a rectangle }Example#include #include "area.cpp" using namespace std; main() { cout Read More
You can get the name of the table in the current ResultSet object using the getTableName() method of the ResultSetMetaData interface. This method accepts an integer value representing the index of a column and, returns a String value representing the name of the table that contains the given column.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );Now, we will insert 7 records in MyPlayers table using INSERT statements −insert into ... Read More