1 工厂方法模式

工厂方法模式结构

跨平台对话框示例

// Button.java
public interface Button {
    void render();
    void onClick();
}

// HtmlButton.java
public class HtmlButton implements Button {
    @Override
    public void render() {
        System.out.println("Html按钮渲染");
        onClick();
    }

    @Override
    public void onClick() {
        System.out.println("点击Html按钮");
    }
}

// WindowsButton.java
public class WindowsButton implements Button {
    @Override
    public void render() {
        System.out.println("Windows按钮渲染");
        onClick();
    }

    @Override
    public void onClick() {
        System.out.println("点击Windows按钮");
    }
}

// Dialog.java
public abstract class Dialog {
    public void renderWindow() {
        Button okButton = createButton();
        okButton.render();
    }

    public abstract Button createButton();
}

// HtmlDialog.java
public class HtmlDialog extends Dialog {
    @Override
    public Button createButton() {
        return new HtmlButton();
    }
}

// WindowsDialog.java
public class WindowsDialog extends Dialog {
    @Override
    public Button createButton() {
        return new WindowsButton();
    }
}

// Demo.java
public class Demo {
    private static Dialog dialog;

    public static void main(String[] args) {
        configure();
        runBusinessLogic();
    }

    static void configure() {
        if (System.getProperty("os.name").equals("Windows 10")) {
            dialog = new WindowsDialog();
        } else {
            dialog = new HtmlDialog();
        }
    }

    static void runBusinessLogic() {
        dialog.renderWindow();
    }
}