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For the type Animal we can make the type Animal [], which is an "array of animals". For the purposes of this example, this array supports both reading and writing elements. We have the option to treat this as either: covariant: a Cat [] is an Animal []; contravariant: an Animal [] is a Cat []; invariant: an Animal [] is not a Cat [] and a Cat ...
In the following Java example cats and dogs are made subtypes of pets. The procedure letsHear() accepts a pet, but will also work correctly if a subtype is passed to it: abstract class Pet { abstract String speak (); } class Cat extends Pet { String speak () { return "Meow!"
The simplest example of type introspection in Java is the instanceof [1] operator. The instanceof operator determines whether a particular object belongs to a particular class (or a subclass of that class, or a class that implements that interface).
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Download as PDF; Printable version; In other projects ... Help. Endemic Fauna of Java — the most populous island in Indonesia. Subcategories. This category has only ...
For example, a simple linearized object would consist of a length field, a code point identifying the class, and a data value. A more complex example would be a command consisting of the length and code point of the command and values consisting of linearized objects representing the command's parameters.