A Programmer's Guide to Java SE 8 Oracle Certified Associate (OCA) by Mughal Khalid A & Rasmussen Rolf W

Author:Mughal, Khalid A & Rasmussen, Rolf W [Mughal, Khalid A]
Language: eng
Format: azw3
Publisher: Pearson Education
Published: 2016-07-21T16:00:00+00:00

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Example 7.14 Choosing the Most Specific Method (Simple Case)

Click here to view code image

class Light { /* ... */ }

class TubeLight extends Light { /* ... */ }

public class Overload {

boolean testIfOn(Light aLight) { return true; } // (1)

boolean testIfOn(TubeLight aTubeLight) { return false; } // (2)

public static void main(String[] args) {

TubeLight tubeLight = new TubeLight();

Light light = new Light();

Light light2 = new TubeLight();

Overload client = new Overload();

System.out.println(client.testIfOn(tubeLight)); // (3) ==> method at (2)

System.out.println(client.testIfOn(light)); // (4) ==> method at (1)

System.out.println(client.testIfOn(light2)); // (5) ==> method at (2)

}

}

Output from the program:

false

true

true

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