CodeBind.com

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();
    }
}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

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))

	}
}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

// 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 1

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

*/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

// 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

*/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

// 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 2

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


*/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

// 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

*/

// Scala - Sets 
object Demo {
  val myset: Set[Int] = Set(1,2,5,8,9,6,4);
  val myset2: Set[Int] = Set(4,2,9,18,19,16,14);
  val names: Set[String] = Set("Max", "Tom", "John");
	def main(args: Array[String]) {
		println(myset + 10);
		println(names("Maxxxx"));
		println(myset.head);
		println(myset.tail);
		println(myset.isEmpty);

		println(myset ++ myset2);
		println(myset.++(myset2))
		
		println(myset.&(myset2));
		println(myset.intersect(myset2));
    println(myset.max);
    
    println(myset.min);
    myset.foreach(println);
    
    for (name <- names) {
      println(name);
    }
	}
}

/*
OUTPUT:
Set(5, 10, 1, 6, 9, 2, 8, 4)
false
5
Set(1, 6, 9, 2, 8, 4)
false
Set(5, 14, 1, 6, 9, 2, 18, 16, 8, 19, 4)
Set(5, 14, 1, 6, 9, 2, 18, 16, 8, 19, 4)
Set(9, 2, 4)
Set(9, 2, 4)
9
1
5
1
6
9
2
8
4
Max
Tom
John


*/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

// Scala - Sets

object Demo {

val myset: Set[Int] = Set(1,2,5,8,9,6,4);

val myset2: Set[Int] = Set(4,2,9,18,19,16,14);

val names: Set[String] = Set("Max", "Tom", "John");

def main(args: Array[String]) {

println(myset + 10);

println(names("Maxxxx"));

println(myset.head);

println(myset.tail);

println(myset.isEmpty);

println(myset ++ myset2);

println(myset.++(myset2))

println(myset.&(myset2));

println(myset.intersect(myset2));

println(myset.max);

println(myset.min);

myset.foreach(println);

for (name <- names) {

println(name);

}

/*

OUTPUT:

Set(5, 10, 1, 6, 9, 2, 8, 4)

false

5

Set(1, 6, 9, 2, 8, 4)

false

Set(5, 14, 1, 6, 9, 2, 18, 16, 8, 19, 4)

Set(9, 2, 4)

9

1

5

1

6

9

2

8

4

Max

Tom

John

*/

Scala – Lists

March 3, 2018 admin 0

// Scala - Lists 
object Demo {
  val mylist: List[Int] = List(1,2,5,8,9,6,4);
  val names: List[String] = List("Max", "Tom", "John");
	def main(args: Array[String]) {
		println(0 :: mylist);  
		println(mylist);  
		println(names);  
		println(1 :: 5:: 9 :: Nil); 
		println(mylist.head);  
		println(names.tail);   
		println(mylist.tail);   
		println(names.isEmpty);   
		println(mylist.reverse);  
		println(List.fill(5)(2)); 		
		println(mylist.max);  
		
		mylist.foreach( println )
		var sum : Int = 0;
		mylist.foreach(sum += _);
		println(sum);
		
		for (name <- names) {
		  println(name);
		}
		 
		println(names(0));
   
	}
}

/*
OUTPUT:
List(0, 1, 2, 5, 8, 9, 6, 4)
List(1, 2, 5, 8, 9, 6, 4)
List(Max, Tom, John)
List(1, 5, 9)
1
List(Tom, John)
List(2, 5, 8, 9, 6, 4)
false
List(4, 6, 9, 8, 5, 2, 1)
List(2, 2, 2, 2, 2)
9
1
2
5
8
9
6
4
35
Max
Tom
John
Max


*/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

// Scala - Lists

object Demo {

val mylist: List[Int] = List(1,2,5,8,9,6,4);

val names: List[String] = List("Max", "Tom", "John");

def main(args: Array[String]) {

println(0 :: mylist);

println(mylist);

println(names);

println(1 :: 5:: 9 :: Nil);

println(mylist.head);

println(names.tail);

println(mylist.tail);

println(names.isEmpty);

println(mylist.reverse);

println(List.fill(5)(2));

println(mylist.max);

mylist.foreach( println )

var sum : Int = 0;

mylist.foreach(sum += _);

println(sum);

for (name <- names) {

println(name);

}

println(names(0));

}

/*

OUTPUT:

List(0, 1, 2, 5, 8, 9, 6, 4)

List(1, 2, 5, 8, 9, 6, 4)

List(Max, Tom, John)

List(1, 5, 9)

1

List(Tom, John)

List(2, 5, 8, 9, 6, 4)

false

List(4, 6, 9, 8, 5, 2, 1)

List(2, 2, 2, 2, 2)

9

1

2

5

8

9

6

4

35

Max

Tom

John

Max

*/

Free Programming Tutorials and Lessons By ProgrammingKnowledge

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

How to install XAMPP on Ubuntu 18.04

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

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

JavaFx Sample code (JavaFx Hello world example)

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

How to install XAMPP on Ubuntu 16.04

Scala – Options (Some or None)

Scala – Tuples

How to Install OpenGL on Ubuntu Linux

Scala – Maps

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

SQLite C/C++- CREATE and OPEN SQLite Database using C/C++

Scala – Sets

Scala – Lists