INTERFACES

Examples of Abstract Method Declarations

9.4.3

class BufferEmpty extends Exception {

BufferEmpty() { super(); }

BufferEmpty(String s) { super(s); }

}

class BufferError extends Exception {

BufferError() { super(); }

BufferError(String s) { super(s); }

}

public interface Buffer {

char get() throws BufferEmpty, BufferError;

}

public interface InfiniteBuffer extends Buffer {

 char get() throws BufferError;

//

override

}

9.4.3.2

Example: Overloading

In the example code:

interface PointInterface {

void move(int dx, int dy);

}

interface RealPointInterface extends PointInterface {

void move(float dx, float dy);

void move(double dx, double dy);

}

the method name

move

 is overloaded in interface

RealPointInterface

 with

three different signatures, two of them declared and one inherited. Any class that

implements interface

RealPointInterface

 must provide implementations of all

three method signatures.

Death, life, and sleep, reality and thought,

Assist me, God, their boundaries to know . . .

 William Wordsworth,

Maternal Grief

191