Java – what is the motivation for attributes?

I'm a little confused about why language has these I'm a java programmer at the beginning of my career, so Java is the only language I write because I actually, you know, get it

So we certainly don't have properties in Java. We write getthis () and setthat (...) methods

What do we get from owning property?

thank you.

Edit: another question: what naming conventions appear in languages with attributes?

Solution

Which one looks more natural?

// A
person.setAge(25)
// B
person.age = 25;
// or
person.Age = 25; //depending on conventions,but that's beside the point

Most people will answer B

This is not only grammar sugar, but also helpful in reflection; In fact, you can distinguish between data and operations without relying on method names

The following are examples of unfamiliar properties in c#:

class Person
{
    public int Age
    {
        set
        {
            if(value<0)
                throw new ArgumentOutOfRangeException();

            OnChanged();
            age = value;
        }

        get { return age; }
    }

    private int age;
    protected virtual void OnChanged() { // ... }
}

In addition, most people always use attributes instead of promoting public members later, for the same reason that we always use get / set; There is no need to rewrite old client code bound to data members