实例化类时如何运行代码？

Question

How can I run code when a new object is created, without having to perform any separate calls? In other words, how can I define what happens during the creation of an object?

For example:

class Apple {
    //code here
}

// ...
Apple banana = new Apple();
// ...

How can I automatically run code at the time I call this:

Apple banana = new Apple();

For example, how can I make one of Apple 's methods be called at the time I create the new Apple ? Coming from Python, I'm looking for something like __init__ .

Answer 1

Add a constructor to your Apple class:

class Apple {
    public Apple () {
        //Your code here
    }
}