Comments by Freddie Francis

Freddie Francis 8-Mar-23 12:18pm View

ive moved the calls into their respected class but it still tells me undeclared, for example here;

public class Journal extends Publication
{
// The year and month when the journal was published
private int month;

/**
* Create a journal.
*
* @param title The title of the journal
* @param month The month when the journal was published
* @param year The year when the journal was published
*/
public Journal(String title, int month, int year)
{
super(title, year);
this.month = month;
database.addPublication(journal);
}

Freddie Francis 8-Mar-23 11:38am View

it is done on blueJ

Freddie Francis 8-Mar-23 11:23am View

ive tried doing this but i am getting error message, undeclared variables.
public class Database {
private ArrayList<publication> publicationList; // An array list collection of publications

/**
* Create a new database
*/
public Database() {
publicationList = new ArrayList<publication>();
}

/**
* Add a publication
*
* @param publication The publication to be added
*/
public void addPublication(Publication publication) {
if (publicationList.contains(publication)) {
System.out.println("This publication has already been added to the list: " + publication);
} else {
publicationList.add(publication);
database.addPublication(book);
database.addPublication(journal);
}
}

Freddie Francis 4-Dec-22 8:24am View

Sorry i forgot to add my last method.

public Alien getNonHumanoids()
{
Iterator<alien> it = aliens.iterator();
while(it.hasNext()){
Alien alien = it.next();
if(alien.getHumanoid() == false){
it.remove();
nonHumanoids.add(alien);
}
}
}

Freddie Francis 2-Dec-22 11:14am View

would this be correct

public void printNumbers()
{
System.out.print (numbers+"");
}

Freddie Francis 1-Dec-22 11:36am View

yes i understand, is there also a method for printing out the keys in a hashmap

Freddie Francis 1-Dec-22 11:05am View

but i need to method to return null if no matching name

Freddie Francis 1-Dec-22 11:00am View

ive got this so far. public String lookUpNumber(String name)
{
if(name = ){
get.HashMap();
}
else{
return null;
}
}

But not sure what to include in the if statement

Freddie Francis 1-Dec-22 10:54am View

ive got this so far. public String lookUpNumber(String name)
{
if(name = ){
get.HashMap();
}
else{
return null;
}
}

But not sure what to include in the if statement

Freddie Francis 25-Nov-22 7:41am View

would this be correct.

Random rand = new Random();
int index = rand.nextInt(choices.size());
return choices.get(index)

Freddie Francis 21-Nov-22 16:45pm View

sorry, but i cannot include a break statement inside the loop, i need another way

Freddie Francis 21-Nov-22 12:29pm View

what am i doing wrong here. It tells me that theres no suitable method found for abs:

if(distance < nearestDistance){
nearestDistance = distance(Math.abs());
nearestAssistant = assistant;
}

Freddie Francis 21-Nov-22 8:18am View

Deleted

Im still unsure how to do this. Ive got this at the moment but its not correct.

else if(distance == nearestDistance){
if(identity < higherID){
nearestAssistant = assistant;
}
}

Comments by Freddie Francis (Top 13 by date)