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ArrayList of classes without having to create an instance of this class first


ArrayList of classes without having to create an instance of this class first

By : maltuna
Date : November 20 2020, 01:01 AM
wish help you to fix your issue You need to create an instance of Person, since this is what your ArrayList expects. Here is how you can complete your task:
code :
public void addMember(String name, int age, String dOB)
{
    Person p = new Person(name,age,dOB);
    members.add(p);
}
public void addMember(String name, int age, String dOB)
    {
    //Create a new Person instance with given parameters
    Person p = new Person(name,age,dOB);

    //Loop through existing Person instances in ArrayList
    for (Person pers : members){
        //If there exists a Person with the same name
        if (pers.getName().equals(name)) {
            //We can stop searching for a duplicate and leave the method
            return;
        }
    }
    //Since we did not exit the method above we did not found any duplicate, therefore it is safe to add our Person instance to our ArrayList
    members.add(p);
}
public String getName() {
   return name;
}
@Override
public boolean equals(Object person)
{
    boolean same = false;

    if (person != null && person instanceof Person)
    {
        same = this.name == ((Person) person).name;
    }

    return same;
}
members.contains(p);


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ArrayList of classes : ArrayList<Class> but how to force those classes to extend some super class?

ArrayList of classes : ArrayList<Class> but how to force those classes to extend some super class?


By : Jason Lam
Date : March 29 2020, 07:55 AM
With these it helps I want to manage an ArrayList of classes. , Use a ? in generics.
code :
List<Class<? extends Filter>> filters = new ArrayList<Class<? extends Filter>>();
How to create an instance of a class from a set of classes?

How to create an instance of a class from a set of classes?


By : Ruben Lopez
Date : March 29 2020, 07:55 AM
help you fix your problem I have a list of similar classes that are all children of the same abstract class. I also have an array of Booleans that should correspond to which class should be used. , Do not rely on naming conventions, create an array rather:
code :
Class<? extends myClass>[] classes = new Class<? extends myClass>[] { 
    myClass1.class, myClass2.class, myClass3.class, myClass4.class
};
boolean[] classesOn = new boolean[classes.length];
if (classesOn[i])  { myClass c = classes[i].getConstructor().newInstance(); }
myClass c;
if (i < classesOn.lenght && classesOn[i])  { 
    c = classes[i]
        .getConstructor(float.class, float.class)
        .newInstance(mouseX, mouseY); 
} else {
    c = new myClass1(mouseX, mouseY);
}
How to prevent other classes to create instance of one class?

How to prevent other classes to create instance of one class?


By : Shafaqat_ali
Date : March 29 2020, 07:55 AM
around this issue If I understand your question, you can put SourceFactory and SourceTypeI in the same package. Then make SourceTypeI final. Next give SourceTypeI package level (default) constructors.
code :
SourceTypeI() { // <-- not public, not private, not protected.
  super();
}
How to create an instance of a class and store them in an array or arraylist? (processing)

How to create an instance of a class and store them in an array or arraylist? (processing)


By : Pavan Teja
Date : March 29 2020, 07:55 AM
this one helps. You're already creating instances of a class and storing it inside an array in this for loop:
code :
for (int i = 0; i < 50; i++) {
    words[i] = new word (x, y);
}
for (int i = 0; i < 50; i++) {
    words[i] = new word (x, y, i);
}
for (int i = 0; i < 50; i++) {
    words[i] = new word (x, y, allWords[i]);
}
Classes in c# - create a string contains the class' instance name

Classes in c# - create a string contains the class' instance name


By : Kron
Date : March 29 2020, 07:55 AM
Does that help I want to create a class in c#, that contains the instance name in an internal string. For example, the class 'Person': , No, it's not possible.
Consider this:
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