Java 天地·Core Java·Lecture Notes·Unitt 07 - Inheritance and Interfaces

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Defining an interface

An interface is defined just like a class, but with the `interface' keyword rather than the `class' keyword. The methods must be defined, but not implemented

For example, the KeyboardListener interface may be defined like this:

interface KeyboardListener
{
void keyPressed();
void keyReleased();
}

We have said that the KeyboardListener has two methods: keyPressed() and keyReleased() but we have not said how these methods are to be carried out. My intention is that keyPressed() will be called whenever the user presses a key, and keyReleased() when the key is released.

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