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ArrayList public constructor - "Constructs an empty list with an initial capacity of ten" - where?


ArrayList public constructor - "Constructs an empty list with an initial capacity of ten" - where?

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ArrayList public constructor - "Constructs an empty list with an initial capacity of ten" - where?
Tag : java , By : appdelivery
Date : November 23 2020, 04:01 AM

I hope this helps . This is an optimization. The developers decided to initialize the ArrayList with an empty backing array, and lazily create a non-empty backing array only when you start adding elements to the List.
When you add the first element (by calling add), it calls
ensureCapacityInternal(size + 1);
minCapacity = Math.max(DEFAULT_CAPACITY, minCapacity);

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Existing solution to "smart" initial capacity for StringBuilder


Tag : java , By : pjkinney
Date : March 29 2020, 07:55 AM
around this issue Make sure you do the performance measurements to make sure you really are getting some benefit for the extra work.
As an alternative to a StringBuilder-like class, consider a StringBuilderFactory. It could provide two static methods, one to get a StringBuilder, and the other to be called when you finish building a string. You could pass it a StringBuilder as argument, and it would record the length. The getStringBuilder method would use statistics recorded by the other method to choose the initial size.

I have added empty constructor in Fragment. but still "make sure class name exists, is public, and has an empty con


Tag : android , By : Marie Ramos
Date : March 29 2020, 07:55 AM
this one helps. Don't override constructor at all. Instead create public static method:
public static HelpFragment newInstance(int i) {
    HelpFragment f = new HelpFragment();
    Bundle args = new Bundle();
    args.putInt("page", i);
    f.setArguments(args);
    return f;
}

The constructor function in a pure virtual class should be "protected" or "public"?


Tag : cpp , By : Salikh
Date : March 29 2020, 07:55 AM
I wish this helpful for you It doesn't really matter, since you're not allowed to construct objects of the base class anyway. Making it protected serves only as a reminder of the fact that the class is supposed to be a base class; it's only cosmetics/documentation.
Consider
struct Base {
    virtual ~Base() = 0;
  protected:
    Base() { std::puts("Base constructor"); }
};

Base::~Base() { std::puts("Base destructor"); }

struct Derived : Base {};

int main()
{
    //Base b;   // compiler error
    Derived d;

    Base *b = new Derived();
    delete b;
}

Why does MemoryStream not offer a constructor taking a "long" capacity?


Tag : chash , By : dbarbot
Date : March 29 2020, 07:55 AM
Hope that helps MemoryStream does not support more than about 2GB of data right now. This is a current limitation. It does not have to exist in principle.
This is simply a case of a feature not implemented (yet).

Using "using" in public to inherit private constructor does not make it public


Tag : cpp , By : user152423
Date : March 29 2020, 07:55 AM
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