Abstract Factory Pattern

design-pattern/src/AbstractFactory2/Main.java

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+package AbstractFactory2;
+
+import AbstractFactory2.abst.Button;
+import AbstractFactory2.abst.GuiFactory;
+import AbstractFactory2.abst.TextArea;
+import AbstractFactory2.concrete.FactoryInstance;
+
+public class Main {
+    public static void main(String[] args) {
+        GuiFactory factory = FactoryInstance.getGuiFactory();
+
+        Button button = factory.createButton();
+        TextArea textArea = factory.createTextArea();
+
+        button.click();
+        System.out.println(textArea.getText());
+    }
+}

design-pattern/src/AbstractFactory2/abst/Button.java

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+package AbstractFactory2.abst;
+
+public interface Button {
+
+    void click();
+}

design-pattern/src/AbstractFactory2/abst/GuiFactory.java

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+package AbstractFactory2.abst;
+
+public interface GuiFactory {
+
+    Button createButton();
+    TextArea createTextArea();
+}

design-pattern/src/AbstractFactory2/abst/TextArea.java

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+package AbstractFactory2.abst;
+
+public interface TextArea {
+    String getText();
+}

design-pattern/src/AbstractFactory2/concrete/FactoryInstance.java

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+package AbstractFactory2.concrete;
+
+import AbstractFactory2.abst.Button;
+import AbstractFactory2.abst.GuiFactory;
+import AbstractFactory2.abst.TextArea;
+
+public class FactoryInstance {
+
+    public static GuiFactory getGuiFactory() {
+
+        switch (getOsCode()) {
+            case 0: return new MacGuiFactory();
+            case 1: return new WinGuiFactory();
+            case 2: return new LinuxGuiFactory();
+        }
+
+        return null;
+    }
+
+    private static int getOsCode() {
+        if (System.getProperty("os.name").equals("Windows 10")){
+            return 1;
+        }
+        return 2;
+    }
+}
+class LinuxButton implements Button {
+    @Override
+    public void click() {
+        System.out.println("Linux Button");
+    }
+}
+class LinuxGuiFactory implements GuiFactory {
+    @Override
+    public Button createButton() {
+        return new LinuxButton();
+    }
+
+    @Override
+    public TextArea createTextArea() {
+        return new LinuxTextArea();
+    }
+}
+class LinuxTextArea implements TextArea {
+    @Override
+    public String getText() {
+        return "Linux TextArea";
+    }
+}
+class MacButton implements Button {
+    @Override
+    public void click() {
+        System.out.println("Mac button");
+    }
+}
+class MacGuiFactory implements GuiFactory {
+    @Override
+    public Button createButton() {
+        return new MacButton();
+
+    }
+
+    @Override
+    public TextArea createTextArea() {
+        return new MacTextArea();
+    }
+}
+class MacTextArea implements TextArea {
+    @Override
+    public String getText() {
+        return "Mac TextArea";
+    }
+}
+class WinButton implements Button {
+    @Override
+    public void click() {
+        System.out.println("Win button");
+    }
+}
+class WinGuiFactory implements GuiFactory {
+    @Override
+    public Button createButton() {
+        return new WinButton();
+
+    }
+
+    @Override
+    public TextArea createTextArea() {
+        return new WinTextArea();
+    }
+}
+class WinTextArea implements TextArea {
+    @Override
+    public String getText() {
+        return "Win TextArea";
+    }
+}