2.4 Code Practice: Question 1

The principal objectives of computer security are to prevent unauthorized users from gaining access to resources, to prevent leg

Lena [83]

Answer:

True is the correct Answer for the above question.

Explanation:

Computer security is a security in which data of the computer is secured from the access of unauthorized users. It is primarily achieved to stop the access grant to the unauthorized user.
It means that there is an authorization point which decides that the user is authorized or not. If the user is authorized then only he can enter the system otherwise he can not able to enter the system.
It helps to secure the data and the data is the important point of the computer system.
The question also states the same which is described above. Hence true is the correct answer.

3 0

3 years ago

Write a Java program that generates GUI (Graphical User Interface). Your program should provide labels and textfields to a user

Alla [95]

Answer:

import javafx.application.Application;

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.control.Tab;

import javafx.scene.control.TabPane;

import javafx.scene.layout.StackPane;

import java.util.ArrayList;

public class Assignment6 extends Application {

private TabPane tabPane;

private CreatePane createPane;

private SelectPane selectPane;

private ArrayList<Club> clubList;

public void start(Stage stage) {

StackPane root = new StackPane();

//clubList to be used in both createPane & selectPane

clubList = new ArrayList<Club>();

selectPane = new SelectPane(clubList);

createPane = new CreatePane(clubList, selectPane);

tabPane = new TabPane();

Tab tab1 = new Tab();

tab1.setText("Club Creation");

tab1.setContent(createPane);

Tab tab2 = new Tab();

tab2.setText("Club Selection");

tab2.setContent(selectPane);

tabPane.getSelectionModel().select(0);

tabPane.getTabs().addAll(tab1, tab2);

root.getChildren().add(tabPane);

Scene scene = new Scene(root, 900, 400);

stage.setTitle("Club Selection Apps");

stage.setScene(scene);

stage.show();

}

public static void main(String[] args)

{

launch(args);

}

import java.util.ArrayList;

import javafx.scene.layout.HBox;

import javafx.event.ActionEvent; //**Need to import

import javafx.event.EventHandler; //**Need to import

public class CreatePane extends HBox {

ArrayList<Club> clubList;

private SelectPane selectPane;

//constructor

public CreatePane(ArrayList<Club> list, SelectPane sePane) {

this.clubList = list;

this.selectPane = sePane;

}

//using the toString method of the Club class.

//It also does error checking in case any of the textfields are empty,

//or a non-numeric value was entered for its number of members

private class ButtonHandler implements EventHandler<ActionEvent> {

//Override the abstact method handle()

public void handle(ActionEvent event) {

//declare any necessary local variables here

//---

//when a text field is empty and the button is pushed

//if ( //---- )

//{

//handle the case here

//}

//else //for all other cases

//{

//when a non-numeric value was entered for its number of

members

//and the button is pushed

//you will need to use try & catch block to catch

//the NumberFormatException

//When a club of an existing club name in the list

//was attempted to be added, do not add it to the list

//and display a message "Club not added - duplicate"

//at the end, don't forget to update the new arrayList

//information on the SelectPanel

//}

} //end of handle() method

} //end of ButtonHandler class

}

import javafx.scene.control.Label;

import javafx.scene.control.CheckBox;

import javafx.scene.layout.*;

import javafx.event.ActionEvent; //**Need to import

import javafx.event.EventHandler; //**Need to import

import java.util.ArrayList;

import javafx.collections.ObservableList;

import javafx.scene.Node;

//import all other necessary javafx classes here

public class SelectPane extends BorderPane {

private ArrayList<Club> clubList;

//constructor

public SelectPane(ArrayList<Club> list) {

//initialize instance variables

this.clubList = list;

//set up the layout

//create an empty pane where you can add check boxes later

//SelectPane is a BorderPane - add the components here

} //end of constructor

//This method uses the newly added parameter Club object

//to create a CheckBox and add it to a pane created in the constructor

//Such check box needs to be linked to its handler class

public void updateClubList(Club newClub)

{

//-------

}

//create a SelectionHandler class

private class SelectionHandler implements EventHandler<ActionEvent> {

//Override the abstact method handle()

public void handle(ActionEvent event){

//When any radio button is selected or unselected

//the total number of members of selected clubs should be updated

//and displayed using a label.

}

} //end of SelectHandler class

} //end of SelectPane class

public class Club {

private String clubName;

private int numberOfMembers;

private String university;

//Constructor to initialize all member variables

public Club() {

clubName = "?";

university = "?";

numberOfMembers = 0;

}

//Accessor method for club name

public String getClubName() {

return clubName;

}

//Accessor method for university

public String getUniversity() {

return university;

}

//Accessor method for number of members

public int getNumberOfMembers() {

return numberOfMembers;

}

//mutator/modifider method for club name

public void setClubName(String someClubName) {

clubName = someClubName;

}

//mutator/modifider method for university

public void setUniversity(String someUniversity) {

university = someUniversity;

}

//mutator/modifider method for number of members

public void setNumberOfMembers(int someNumber) {

numberOfMembers = someNumber;

}

//toString() method returns a string containg its name, number of members, and

university

public String toString() {

String result = "\nClub Name:\t\t" + clubName

+ "\nNumber Of Members:\t" + numberOfMembers

+ "\nUniversity:\t\t" + university

+ "\n\n";

return result;

}

Explanation:

4 0

4 years ago

What do customers use to access the internet, usually for a monthly fee?

kati45 [8]

To search things like answers,order things on Amazon,or go watch videos on Youtube

4 0

3 years ago

a) Write a program that prompts for an integer—let’s call it X—and then finds the sum of X consecutive integers starting at 1. T

Alex73 [517]

Answer:

Solution a

n = int(input("Enter an integer: "))
sum = 0
for x in range(1, n+1):
sum += x
print(sum)

Solution b

n = int(input("Enter an integer: "))
for a in range(1, n + 1):
sum = 0
for x in range(1, a+1):
sum += x
print(sum)

Explanation:

Solution code is written in Python 3.

Solution a

First get the user input for an integer (Line 1).

Create a variable sum and initialize it with zero value (Line 3).

Create a for loop to traverse through the number from 1 to integer n (inclusive) and sum up the current number x (Line 5-6).

Print the sum to terminal (Line 8).

Solution b

Create an outer for loop that traverse through the number from 1 to integer n (inclusive) (Line 3).

Create an inner loop that traverse through the number from 1 to current a value from the outer loop and sum up the current x value (Line 5-6).

Print the sum to terminal (Line 7) and proceed to next iteration and reset the sum to zero (Line 4).

7 0

3 years ago

What is the database used for

ELEN [110]

Sometimes referred to as database management systems, database software tools are primarily used for storing, modifying, extracting, and searching for information within a database.

7 0

3 years ago