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→Code Example
===Code Example===
/*
* GUIFactory example
*/
public abstract class GUIFactory {
public static GUIFactory getFactory() {
int sys = readFromConfigFile("OS_TYPE");
if (sys == 0) {
return(new WinFactory());
} else {
return(new OSXFactory());
}
}
public abstract Button createButton();
}
class WinFactory extends GUIFactory {
public Button createButton() {
return(new WinButton());
}
}
class OSXFactory extends GUIFactory {
public Button createButton() {
return(new OSXButton());
}
}
public abstract class Button {
private String caption;
public abstract void paint();
public String getCaption(){
return caption;
}
public void setCaption(String caption){
this.caption = caption;
}
}
class WinButton extends Button {
public void paint() {
System.out.println("I'm a WinButton: " + getCaption());
}
}
class OSXButton extends Button {
public void paint() {
System.out.println("I'm a OSXButton : " + getCaption());
}
}
public class Application {
public static void main(String[] args) {
GUIFactory aFactory = GUIFactory.getFactory();
Button aButton = aFactory.createButton();
aButton.setCaption("Play");
aButton.paint();
}
//output is
//I'm a WinButton: Play
//or
//I'm a OSXButton: Play
}
===Reference===
