Sync Factory Method, Abstract Factory, Builder, Prototype to Java 25; fix post/code mismatches

01-creational/abstract-factory/Application.java

@@ -1,21 +1,30 @@
 package abstractfactory;
 
-/** Client - uses the factory without knowing concrete classes */
 public class Application {
-    private final Button button;
-    private final Checkbox checkbox;
 
-    public Application(GUIFactory factory) {
-        button   = factory.createButton();
-        checkbox = factory.createCheckbox();
+    // The client holds references to the Abstract Factory and Abstract Products.
+    // It never imports LightButton, DarkButton, or any concrete class.
+    private final UIFactory factory;
+    private Button submitButton;
+    private TextField usernameField;
+
+    public Application(UIFactory factory) {
+        this.factory = factory;  // theme is injected; client doesn't decide
+    }
+
+    public void buildUI() {
+        // Ask the factory — get consistent products from the same family
+        submitButton = factory.createButton();
+        usernameField = factory.createTextField();
     }
 
     public void render() {
-        button.render();
-        checkbox.render();
+        System.out.println("Rendering login screen:");
+        usernameField.render();
+        submitButton.render();
     }
 
-    public void simulateClick() {
-        button.onClick();
+    public void simulateSubmit() {
+        submitButton.onClick();
     }
 }

01-creational/abstract-factory/Button.java

@@ -1,6 +1,7 @@
 package abstractfactory;
 
+// Every button, regardless of theme, must be able to render and handle clicks
 public interface Button {
-    void render();
-    void onClick();
+    void render();   // draw on screen
+    void onClick();  // respond to a click event
 }

01-creational/abstract-factory/Checkbox.java

@@ -1,5 +0,0 @@
-package abstractfactory;
-
-public interface Checkbox {
-    void render();
-}

01-creational/abstract-factory/DarkButton.java

@@ -0,0 +1,11 @@
+package abstractfactory;
+public class DarkButton implements Button {
+    @Override
+    public void render() {
+        System.out.println("[Dark Button] Charcoal background, white text, no border");
+    }
+    @Override
+    public void onClick() {
+        System.out.println("[Dark Button] Bright highlight ripple effect");
+    }
+}

01-creational/abstract-factory/DarkTextField.java

@@ -0,0 +1,10 @@
+package abstractfactory;
+public class DarkTextField implements TextField {
+    private String value = "";
+    @Override
+    public void render() {
+        System.out.println("[Dark TextField] Dark gray background, light placeholder text");
+    }
+    @Override
+    public String getValue() { return value; }
+}

01-creational/abstract-factory/DarkThemeFactory.java

@@ -0,0 +1,14 @@
+package abstractfactory;
+
+public class DarkThemeFactory implements UIFactory {
+
+    @Override
+    public Button createButton() {
+        return new DarkButton();        // Only Dark products come from this factory
+    }
+
+    @Override
+    public TextField createTextField() {
+        return new DarkTextField();
+    }
+}

01-creational/abstract-factory/GUIFactory.java

@@ -1,7 +0,0 @@
-package abstractfactory;
-
-/** Abstract Factory - creates families of related UI components */
-public interface GUIFactory {
-    Button createButton();
-    Checkbox createCheckbox();
-}

01-creational/abstract-factory/LightButton.java

@@ -0,0 +1,11 @@
+package abstractfactory;
+public class LightButton implements Button {
+    @Override
+    public void render() {
+        System.out.println("[Light Button] White background, dark text, 1px gray border");
+    }
+    @Override
+    public void onClick() {
+        System.out.println("[Light Button] Subtle gray ripple effect");
+    }
+}

01-creational/abstract-factory/LightTextField.java

@@ -0,0 +1,10 @@
+package abstractfactory;
+public class LightTextField implements TextField {
+    private String value = "";
+    @Override
+    public void render() {
+        System.out.println("[Light TextField] White background, dark placeholder text");
+    }
+    @Override
+    public String getValue() { return value; }
+}

01-creational/abstract-factory/LightThemeFactory.java

@@ -0,0 +1,14 @@
+package abstractfactory;
+
+public class LightThemeFactory implements UIFactory {
+
+    @Override
+    public Button createButton() {
+        return new LightButton();       // Only Light products come from this factory
+    }
+
+    @Override
+    public TextField createTextField() {
+        return new LightTextField();
+    }
+}

01-creational/abstract-factory/MacButton.java

@@ -1,6 +0,0 @@
-package abstractfactory;
-
-public class MacButton implements Button {
-    @Override public void render()   { System.out.println("[Mac] Rendering button with rounded corners"); }
-    @Override public void onClick()  { System.out.println("[Mac] Button clicked - glow animation"); }
-}

01-creational/abstract-factory/MacCheckbox.java

@@ -1,5 +0,0 @@
-package abstractfactory;
-
-public class MacCheckbox implements Checkbox {
-    @Override public void render() { System.out.println("[Mac] Rendering checkbox with rounded tick box"); }
-}

01-creational/abstract-factory/MacFactory.java

@@ -1,6 +0,0 @@
-package abstractfactory;
-
-public class MacFactory implements GUIFactory {
-    @Override public Button   createButton()   { return new MacButton(); }
-    @Override public Checkbox createCheckbox() { return new MacCheckbox(); }
-}

01-creational/abstract-factory/Main.java

@@ -1,22 +1,16 @@
 package abstractfactory;
 
+// Entry point: the ONLY place that knows the theme
 public class Main {
     public static void main(String[] args) {
-        System.out.println("=== Abstract Factory Pattern Demo ===\n");
 
-        String os = System.getProperty("os.name", "Windows").toLowerCase();
-        GUIFactory factory = os.contains("mac") ? new MacFactory() : new WindowsFactory();
-
-        System.out.println("Detected OS family: " + (os.contains("mac") ? "Mac" : "Windows"));
-        System.out.println();
+        // Production: read theme from config or OS preference
+        String theme = System.getProperty("app.theme", "light");
+        UIFactory factory = "dark".equals(theme) ? new DarkThemeFactory() : new LightThemeFactory();
 
         Application app = new Application(factory);
+        app.buildUI();
         app.render();
-        app.simulateClick();
-
-        System.out.println("\n--- Forcing Mac UI ---");
-        Application macApp = new Application(new MacFactory());
-        macApp.render();
-        macApp.simulateClick();
+        app.simulateSubmit();
     }
 }

01-creational/abstract-factory/TextField.java

@@ -0,0 +1,7 @@
+package abstractfactory;
+
+// Every text field must be able to render and return its value
+public interface TextField {
+    void render();
+    String getValue();
+}

01-creational/abstract-factory/UIFactory.java

@@ -0,0 +1,13 @@
+package abstractfactory;
+
+public interface UIFactory {
+
+    // Factory method for buttons — returns the abstract type, not LightButton or DarkButton
+    Button createButton();
+
+    // Factory method for text fields — same principle
+    TextField createTextField();
+
+    // Adding a new product type (e.g., Checkbox) means adding a method here
+    // AND implementing it in every Concrete Factory. This is the one cost of the pattern.
+}

01-creational/abstract-factory/WindowsButton.java

@@ -1,6 +0,0 @@
-package abstractfactory;
-
-public class WindowsButton implements Button {
-    @Override public void render()   { System.out.println("[Windows] Rendering button with square corners"); }
-    @Override public void onClick()  { System.out.println("[Windows] Button clicked - raised border effect"); }
-}

01-creational/abstract-factory/WindowsCheckbox.java

@@ -1,5 +0,0 @@
-package abstractfactory;
-
-public class WindowsCheckbox implements Checkbox {
-    @Override public void render() { System.out.println("[Windows] Rendering checkbox with square tick box"); }
-}

01-creational/abstract-factory/WindowsFactory.java

@@ -1,6 +0,0 @@
-package abstractfactory;
-
-public class WindowsFactory implements GUIFactory {
-    @Override public Button   createButton()   { return new WindowsButton(); }
-    @Override public Checkbox createCheckbox() { return new WindowsCheckbox(); }
-}