NAMES

Example:

public

 Fields, Methods, and Constructors

6.6.6

package morepoints;

public class PlusPoint extends points.Point {

public void move(int dx, int dy) {

super.move(dx, dy);

//

compile time error

moveAlso(dx, dy);

}

}

Because move of

Point

 is not overridden by

move

 in

PlusPoint

, the method

moveAlso

 in

Point

 never calls the method move in

PlusPoint

.

Thus if you delete the

super.move

 call from

PlusPoint

 and execute the test

program:

import points.Point;

import morepoints.PlusPoint;

class Test {

    public static void main(String[] args) {

        PlusPoint pp = new PlusPoint();

        pp.move(1, 1);

    }

}

it terminates normally. If move of

Point

 were overridden by

move

 in

PlusPoint

,

then this program would recurse infinitely, until a

StackoverflowError

occurred.

6.6.6   Example:

public

 Fields, Methods, and Constructors

A

public

 class member or constructor is accessible throughout the package

where it is declared and from any other package that has access to the package in

which it is declared ( 7.4.4). For example, in the compilation unit:

package points;

public class Point {

int x, y;

public void move(int dx, int dy) {

x += dx; y += dy;

moves++;

}

public static int moves = 0;

}

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