Java 17 Quick Syntax Reference by Mikael Olsson
Author:Mikael Olsson
Language: eng
Format: epub
ISBN: 9781484273715
Publisher: Apress
// Subclass (child class)
class Apple extends Fruit
{
public String variety;
}
A class in Java may only inherit from one superclass, and if no class is specified, it will implicitly inherit from Object. Therefore, Object is the root class of all classes.// Same as class MyClass {}
class MyClass extends Object {}
Upcasting
Conceptually, a subclass is a specialization of the superclass. This means that Apple is a kind of Fruit, as well as an Object, and can therefore be used anywhere a Fruit or Object is expected. For example, if an instance of Apple is created, it can be upcast to Fruit because the subclass contains everything in the superclass.Apple a = new Apple();
Fruit f = a;
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