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My OOP Approach Seems Wrong - Having to Check Class


My OOP Approach Seems Wrong - Having to Check Class

By : ivan
Date : November 14 2020, 04:51 PM
This might help you You use the interface where you're not interested in the implementation. So the interface should provide a Connect() method, which is implemented by the classes.
The classes then contain properties required for that specific connection type. Like this TcpConnection:
code :
public interface IConnection
{
    void Connect();
}

public class TcpConnection : IConnection
{
    public string Host { get; private set; }
    public int Port { get; private set; }

    private Socket _socket;

    public TcpConnection(string host, int port)
    {
        Host = host;
        Port = port;
    }

    public void Connect()
    {
        _socket = new Socket(...);
    }
}
IConnection connectionInfo = new TcpConnection("example.com", "1337");


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Class interface or enum expected error in temperature lab. Please check and see what I did wrong and explain

Class interface or enum expected error in temperature lab. Please check and see what I did wrong and explain


By : Clay McCullough
Date : March 29 2020, 07:55 AM
it should still fix some issue Usually eclipse is preferred for java development. You did silly mistakes while coding for e.g 1) There were 2 constructors with the same signature which is not allowed in java. 2) You used variables which were not declared like "in" in the while loop to accept user input for "y/n". 3) your missed in enclosing of brackets. Try writing your code on your own instead of copying it from somewhere. Below is the rectified code. Help your self.
code :
import java.util.Scanner;

public class TemperatureLab {

    public TemperatureLab() {
    }

    public static void Temperaturelab(String[] args) {

        Scanner input = new Scanner(System.in);
        // Enter a temperature between -20 and 110 degrees fahrenheit.
        System.out.println("Enter temperature:");
        int temperature = input.nextInt();
        if (temperature >= 75) {
            System.out.println("You can go swimming");
        } else {
            System.out.println("Try again");
        }
        if (temperature > 60 || temperature <= 85) {
            System.out.println("You can play tennis");
        } else {
            System.out.println("Try again");
        }
        if (temperature < 10 || temperature <= 32) {
            System.out.println("You can go skiing");
        } else {
            System.out.println("Try again");
        }
        if (temperature <= 10) {
            System.out.println("You can play checkers");
        } else {
            System.out.println("Try again");
        }
        if (temperature < 32 || temperature <= 70) {
            System.out.println("You can play soccer");
        } else {
            System.out.println("Try again");
        }

        String answer;
        boolean yn;

        System.out.println("y/n");
        while (true) {
            answer = input.nextLine().trim().toLowerCase();
            if (answer.equals("y")) {
                yn = true;
                break;
            } else if (answer.equals("n")) {
                yn = false;
                break;
            } else {
                System.out
                        .println("Sorry, I didn't catch that. Please answer y/n");

            }
        }
    }
}
Wrong approach or Wrong OOP design?

Wrong approach or Wrong OOP design?


By : Paulo Bragança
Date : March 29 2020, 07:55 AM
I hope this helps . The default keyword was not added to the Java language to do the kind of thing which you seem to be trying to achieve. Data defined in an interface is intended to be constant - the modifiers 'public static' are automatically applied to any field definitions in an interface. If you create a default method in the interface then it must either be stateless or act directly only on purely statically available state. Default methods can call other interface methods to modify instance state, .
By placing personsInteracting field in the interface, you made the same instance common to every object implementing that interface, and so your tryOccupying method was acting on purely global state.
code :
public interface Interactable <E extends Interactable> {
    ...
    boolean tryOccupiedBy (final Person person, final Interactions interaction)
        throws InteractionNotPossibleException;
    ...
}

public abstract class InteractiveObject implements Interactable {
    private final List<Person> personsInteracting = new ArrayList<>();
    private final List<Person> personsWaiting     = new ArrayList<>();
    ...
    @Override
    public final boolean tryOccupiedBy (final Person person, final Interactions interaction)
        throws InteractionNotPossibleException {
        boolean isOccupied = false;
        if (!isFurtherActionsAllowed()) {
            throw new InteractionNotPossibleException(this + " is already in use by some other " +
                                                      "person.");
        }
        personsInteracting.add(person);
        currentInteraction = interaction;
        return isOccupied;
    }
    ...
}
Using awk in a wrong approach

Using awk in a wrong approach


By : Suja Ganesh
Date : March 29 2020, 07:55 AM
Does that help This uses exact string matching and so cannot fail on partial matches or if your old title contains : or regexp metacharacters or if the new title contains backreferences (e.g. &) or if a backslash (\) appears in any field or any of the other situations that your other scripts to date will fail on:
code :
$ cat tst.sh
read -r oldTitle
read -r authorName

echo "Enter a new title"
read -r newTitle

awk '
BEGIN {
    ot=ARGV[1]; nt=ARGV[2]; an=ARGV[3]
    ARGV[1] = ARGV[2] = ARGV[3] = ""
}
tolower($0) == tolower(ot":"an) {
     $0 = nt":"an
     found = 1
}
{ print }
END {
    if ( !found ) {
        print "Error" | "cat>&2"
    }
}
' "$oldTitle" "$newTitle" "$authorName" cutText.txt > temp2.txt &&
mv -f temp2.txt cutText.txt
$ cat cutText.txt
Hairy Potter:Rihanna
MARY IS A LITTLE LAMB:Kenny
Sing along:May

$ ./tst.sh
mary is a little lamb
kenny
Enter a new title
Mary is not a lamb

$ cat cutText.txt
Hairy Potter:Rihanna
Mary is not a lamb:kenny
Sing along:May
how to tell if specifications are modelled using database oriented approach or class design oriented approach

how to tell if specifications are modelled using database oriented approach or class design oriented approach


By : Abhinav Singh Parmar
Date : March 29 2020, 07:55 AM
this one helps. What comes to my mind, is that in OOP, classes(objects) contain methods, whereas a database is just a collection of relationships and values. Therefore:
If you can say a problem is about how "things" in the specification relate to each other you have a database design problem.
Is calling my Repository class from an IValidatable object a wrong approach

Is calling my Repository class from an IValidatable object a wrong approach


By : Zach Jones
Date : March 29 2020, 07:55 AM
Hope this helps
So my question is whether calling my model repository from my Ivalidatble object a right approach to follow, or i should only be calling my repository class from inside the controller classes ?
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