CodeBind.com - Page 2 of 20 - Free Programming Tutorials and Lessons By ProgrammingKnowledge

Set up Virtual Box and Vagrant on ubuntu

How to install Vagrant on Ubuntu 18.04 LTS (Linux)

May 6, 2018 admin 1

I this post we will see How to install and setup Vagrant on Ubuntu 18.04 LTS. Vagrant is an open-source software for […]

How to Enable SSH on Ubuntu 18.04 LTS (Install openssh-server)

May 6, 2018 admin 1

In this post we will see how to enable SSH or Secure Shell service on our Ubuntu 18.04 LTS operating […]

How-to-Install-OpenCV-in-Ubuntu-16.04-LTS-for-Python

How to Install OpenCV in Ubuntu 18.04 LTS for Python

May 6, 2018 admin 1

In this post we will see How to Install OpenCV in Ubuntu for Python OpenCV is an image processing library […]

How to Change Hostname in Ubuntu 18.04 (Change Computer Name)

May 6, 2018 admin 0

In this tutorial we will see How to Change Hostname in Ubuntu 18.04. This method will work without the need […]

How to install XAMPP on Ubuntu 18.04

May 6, 2018 admin 0

In this post we will see How to install XAMPP in Ubuntu 18.04 LTS. Step 1 : Open the link https://www.apachefriends.org/download.html in […]

How to install Java JDK 10 on Ubuntu 18.04 / Ubuntu 16.04

May 5, 2018 admin 2

This Post shows How to install Java JDK 10 on Ubuntu 18.04. In order to install Oracle Java JDK 1o On […]

Install Guest Additions using virtual box.

How Install VirtualBox Guest Additions on Ubuntu 18.04 Guest / virtual machine

May 1, 2018 admin 2

The new Ubuntu 18.04 LTS is out now. But VirtualBox Guest Additions software is not working properly after installation. So this […]

JavaFx Sample code (JavaFx Hello world example)

April 23, 2018 admin 0

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
 
public class HelloWorld extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
 
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
            }
        });
        
        StackPane root = new StackPane();
        root.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }
}

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import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.StackPane;

import javafx.stage.Stage;

public class HelloWorld extends Application {

public static void main(String[] args) {

launch(args);

}

@Override

public void start(Stage primaryStage) {

primaryStage.setTitle("Hello World!");

Button btn = new Button();

btn.setText("Say 'Hello World'");

btn.setOnAction(new EventHandler<ActionEvent>() {

@Override

public void handle(ActionEvent event) {

System.out.println("Hello World!");

}

});

StackPane root = new StackPane();

root.getChildren().add(btn);

primaryStage.setScene(new Scene(root, 300, 250));

primaryStage.show();

}

Scala Tutorial – map, flatMap, flatten and filter (Higher-order Methods)

April 7, 2018 admin 1

// Scala - map and filter
object Demo {
  val lst = List(1, 2, 3, 5, 7, 10, 13);
  val mymap = Map(1 -> "Tom", 2 -> "Max", 3 -> "John");
	def main(args: Array[String]) {
	  println(lst.map(x => x / 0.2));
	  println(lst.map(x => "hi" * x));
	  println(mymap.mapValues(x => "hi " + x));
	  println("hello".map(_.toUpper));
	  println(List(List(1,2,3), List(3,4,5)).flatten);
	  println(lst.flatMap(x => List(x, x+1)));
	  
	  println(lst.filter(x => x%2!=0))

	}
}

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// Scala - map and filter

object Demo {

val lst = List(1, 2, 3, 5, 7, 10, 13);

val mymap = Map(1 -> "Tom", 2 -> "Max", 3 -> "John");

def main(args: Array[String]) {

println(lst.map(x => x / 0.2));

println(lst.map(x => "hi" * x));

println(mymap.mapValues(x => "hi " + x));

println("hello".map(_.toUpper));

println(List(List(1,2,3), List(3,4,5)).flatten);

println(lst.flatMap(x => List(x, x+1)));

println(lst.filter(x => x%2!=0))

}

How to install XAMPP on Ubuntu 16.04

April 4, 2018 admin 0

In this post we will see How to install XAMPP in Ubuntu 16.04. Step 1 : Open the link https://www.apachefriends.org/download.html […]

Scala – Options (Some or None)

March 28, 2018 admin 0

// Scala - Options (Some or None)
object Demo {
  val lst = List(1, 2, 3);
  val map = Map(1 -> "Tom", 2 -> "Max", 3 -> "John");
  val opt : Option[Int] = Some(55);
	def main(args: Array[String]) {
	  println(lst.find(_ > 2).getOrElse(0));
	  println(map.get(5).getOrElse("No_name_found"));
	  
	  println(opt.isEmpty)
	  println(opt.get)

	}
}


/*
3
No_name_found
false
55

*/

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// Scala - Options (Some or None)

object Demo {

val lst = List(1, 2, 3);

val map = Map(1 -> "Tom", 2 -> "Max", 3 -> "John");

val opt : Option[Int] = Some(55);

def main(args: Array[String]) {

println(lst.find(_ > 2).getOrElse(0));

println(map.get(5).getOrElse("No_name_found"));

println(opt.isEmpty)

println(opt.get)

}

/*

3

No_name_found

false

55

*/

Scala – Tuples

March 26, 2018 admin 1

// Scala - Tuples 
object Demo {
  val mytuple = (1, 2, "hello", true);
  val mytuple2 = new Tuple3(1, 2, "hello");
  val mytuple3 = new Tuple3(1, "hello",  (2,3));
	def main(args: Array[String]) {
		println(mytuple._1);
		println(mytuple._2);
		println(mytuple._3);
		println(mytuple._4);
		println(mytuple2._3);
		
		mytuple.productIterator.foreach{
		  i => println(i);
		}
		
		
		println(1 -> "Tom" -> true);
		println(mytuple3._3._2);
	}
}

/*
OUTPUT:
1
2
hello
true
hello
1
2
hello
true
((1,Tom),true)
3

*/

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// Scala - Tuples

object Demo {

val mytuple = (1, 2, "hello", true);

val mytuple2 = new Tuple3(1, 2, "hello");

val mytuple3 = new Tuple3(1, "hello", (2,3));

def main(args: Array[String]) {

println(mytuple._1);

println(mytuple._2);

println(mytuple._3);

println(mytuple._4);

println(mytuple2._3);

mytuple.productIterator.foreach{

i => println(i);

}

println(1 -> "Tom" -> true);

println(mytuple3._3._2);

}

/*

OUTPUT:

1

2

hello

true

hello

1

2

hello

true

((1,Tom),true)

3

*/

How to Install OpenGL on Ubuntu Linux

March 22, 2018 admin 0

What Is OpenGL? OpenGL is a Graphics rendering API which is operating system independent, window system independent and has high-quality […]

Scala – Maps

March 14, 2018 admin 0

// Scala - Maps 
object Demo {
  val mymap : Map[Int, String] =
    Map(801 -> "max", 802 -> "Tom", 804 -> "July");
  val mymap2 : Map[Int, String] =
    Map(805 -> "lua");
	def main(args: Array[String]) {
		println(mymap);
		println(mymap(801));
		println(mymap.keys);
		println(mymap.values);
		println(mymap.isEmpty);
		
		mymap.keys.foreach { key =>
		  println("key " + key);
		  println("Value "+ mymap(key));
		  
		}
		
		println(mymap.contains(801000));
		println(mymap ++ mymap2);
		println(mymap.size);
	}
}

/*
output:
Map(801 -> max, 802 -> Tom, 804 -> July)
max
Set(801, 802, 804)
MapLike.DefaultValuesIterable(max, Tom, July)
false
key 801
Value max
key 802
Value Tom
key 804
Value July
false
Map(801 -> max, 802 -> Tom, 804 -> July, 805 -> lua)
3


*/

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// Scala - Maps

object Demo {

val mymap : Map[Int, String] =

Map(801 -> "max", 802 -> "Tom", 804 -> "July");

val mymap2 : Map[Int, String] =

Map(805 -> "lua");

def main(args: Array[String]) {

println(mymap);

println(mymap(801));

println(mymap.keys);

println(mymap.values);

println(mymap.isEmpty);

mymap.keys.foreach { key =>

println("key " + key);

println("Value "+ mymap(key));

}

println(mymap.contains(801000));

println(mymap ++ mymap2);

println(mymap.size);

}

/*

output:

Map(801 -> max, 802 -> Tom, 804 -> July)

max

Set(801, 802, 804)

MapLike.DefaultValuesIterable(max, Tom, July)

false

key 801

Value max

key 802

Value Tom

key 804

Value July

false

Map(801 -> max, 802 -> Tom, 804 -> July, 805 -> lua)

3

*/

SQLite C/C++- CREATE Table in SQLite Database using C/C++

March 7, 2018 admin 1

SQLite C/C++ – CREATE Table in SQLite Database using C/C++ SQLite C/C++- CREATE Table in SQLite Database using C/C++ […]