Template Method Pattern

Java

by techbard 2016. 7. 20. 21:43

# Template.java

public abstract class Template {
public boolean isOn;

public Template() {
this.isOn = false;
}

abstract void welcome();
abstract void turnOn();
abstract void turnOff();

public final void setup() {
if (!isOn) {
welcome();
turnOn();
}
}

public final void toggleSwitch() {
if (this.isOn)
turnOff();
else {
welcome();
turnOn();
}
}
}

# PC.java

public class PC extends Template {

@Override
void welcome() {
System.out.println("Welcome to My PC!");
}

@Override
void turnOn() {
super.isOn = true;
System.out.println("PC is on.");
}

@Override
void turnOff() {
super.isOn = false;
System.out.println("PC is off.");
}
}

# TV.java

public class TV extends Template {

@Override
void welcome() {
System.out.println("Welcome to My TV!");
}

@Override
void turnOn() {
super.isOn = true;
System.out.println("TV is on.");
}

@Override
void turnOff() {
super.isOn = false;
System.out.println("TV is off.");
}
}

# Main.java

public class Main {
public static void main(String[] args) {
PC pc = new PC();
// startup and welcome screen
pc.setup();

// PC off
pc.toggleSwitch();

// startup and welcome screen again
pc.toggleSwitch();

System.out.println("====================");

TV tv = new TV();
tv.setup();
tv.toggleSwitch();
}
}