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Objects and transferring objects between methods


By : Gene Coccozza
Date : October 14 2020, 02:22 PM
wish of those help "So I actually did not wish to send Konto object I wanted to create them in kontoErsteller and then use them whenever I want with their names bankKonto1 and bankKonto2"
You don't want them to be local variables in the kontoErsteller method but instead class members. For this to makes sense you should probably have two classes, a Konto class and one class that handle Konto objects. So let's call this class KontoHandler
code :
public class KontoHandler {
    Konto bankKonto1;
    Konto bankKonto2;

}
 public class KontoHandler {
    Konto bankKonto1;
    Konto bankKonto2;

    public KontoHandler() {
         bankKonto1 = new Konto();
         bankKonto2 = new Konto();
    }
}
public int start() {
    Entrance neuEnterance = new Entrance();
    ...
}


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How to use Collections methods(removeAll() and retainAll()) for two objects. (objects are parent-child relation)


By : Bill Lagarde
Date : March 29 2020, 07:55 AM
will help you Java collections rely on the equals and hashCode methods (the latter is used by HashMaps, HashSets and others).
If you want to be able to use the data structure capabilities of Java collections (such as removeAll, retainAll etc.), you need to supply objects with proper implementations of equals and hashCode.
code :
public class ItemWrapper {
    private final Item item;
    public ItemWrapper(Item item) {
        this.item = item;
    }

    public Item getItem() {
        return item;
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof ItemWrapper && item.getId().equals(((ItemWrapper) obj).item.getId());
    }

    @Override
    public int hashCode() {
        return item.getId().hashCode();
    }
}

Passing big objects references instead of small objects to methods have any differences in processing or memory consumpt


By : Abhishek Gupta
Date : March 29 2020, 07:55 AM
like below fixes the issue Since Java passes only references to objects (and copies them, making it technically pass-by-value), there is no memory overhead for passing "big objects". Your Example 1 actually uses a little more memory.
However, there may still be good reason to do it that way: it removes a dependency and allows you to call doSomething on data that is not part of a BigObject. This may or may not be an advantage. If it gets called a lot with BigObject parameters, you'd have a lot of duplicate code extracting those values, which would not be good.
code :
doSomething(myBigObject.getLabels().getMainName(), 
            myBigObject.getCar(), 
            myBigObject.isRealCar());

Is there a preferred method of transferring 'intentionally generic' String or Array JavaScript methods to other objects?


By : jasmien s
Date : March 29 2020, 07:55 AM
I hope this helps you . In case you need toUpperCase function to work only with arrays then you could extend Array class like that:
code :
Array.prototype.toUpperCase = function () {
    return String(this).toUpperCase();
};
var foo = [];
foo.push('a');
foo.toUpperCase();

Why does javascript's ES6/Harmony Set objects return empty objects for the keys/values/entries methods?


By : May Peng
Date : March 29 2020, 07:55 AM
wish helps you ES6 has added some new tricks including iteration protocols. You may want to take a look at Iteration Protocols on MDN to get a tighter grasp on how to utilize them. for(item in array) is still around, but you can use the new for ... of on certain things.
Considering your code:
code :
var x = new Set
x.add(1)
x.add(2)
x.values()
for(let z of x){
    console.log(z);
}
1
2

Unable to call objects methods in django ''function' object has no attribute 'objects'"


By : HITURAJ
Date : March 29 2020, 07:55 AM
I hope this helps you . Based on the error message, and your comment, you have constructed a view function with the name Alumno, as in:
code :
# app/views.py

from app.models import Alumno

def Alumno(request):
    # ...
    pass

def mostrar_alumnos(request):
    alumnos = Alumno.objects.all()
    return render(request, 'mostrar_alumnos.html', {'Alumno': alumnos})
# app/views.py

from app.models import Alumno

def alumno(request):
    # ...
    pass

def mostrar_alumnos(request):
    alumnos = Alumno.objects.all()
    return render(request, 'mostrar_alumnos.html', {'alumnos': alumnos})
{% if alumnos %}
<ul>

    {% for alumno in alumnos %}
        <td>{{ Alumno.dni }}</td>
        <td>{{ Alumno.nombre }}</td>
        <td>{{ Alumno.apellido1 }}</td>
        <td>
         <a class="btn btn-secondary" href="{% url 'actualizar_alumno' alumno.dni %}"> Editar</a>
        <a class="btn btn-danger" href="{% url 'eliminar_alumno' alumno.dni %}"> Esborrar</a> </td>
    {% endfor %}
</ul>
{% endif %}
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