中介者模式

一、題目：

某軟體公司需要開發一套圖形使用者介面類庫，該類庫包含若干個預定義的窗格物件，例如TextPane，ListPane，GraphicPane，視窗之間不允許直接呼叫，具有該類庫的應用由一個包含一組窗格的視窗（Window）組成，視窗需要協調窗格之間的行為，採用中介者模式收集系統
（1）繪製中介者模式結構檢視
（2）給出例項類圖並實現程式碼。

二、所用模式結構檢視：

三、例項類圖：

四、例項實現程式碼：

(因為區分，所以在類的前面加了Gj19)

抽象中介者 -視窗

package gjMediatorPattern;

/**
 * 抽象中介者 -視窗
 * @author
 
 gongjian
 *
 */
public abstract class Gj19Window {
    public abstract void doSomeThing(Gj19Pane pane,String order);
}

具體中介者

package gjMediatorPattern;
/**
 * 具體中介者 
 * @author gongjian
 */
public class Gj19ConcreteWindow extends Gj19Window{
    private Gj19GraphicPane graphicPane;
private Gj19ListPane listPane;
    private
 
 Gj19TextPane textPane;

    public Gj19GraphicPane getGraphicPane() {
        return graphicPane;
    }
    public void setGraphicPane(Gj19GraphicPane graphicPane) {
        this.graphicPane = graphicPane;
    }
    public Gj19ListPane getListPane() {
        return listPane;
    }
    public void setListPane
 
(Gj19ListPane listPane) {
        this.listPane = listPane;
    }
    public Gj19TextPane getTextPane() {
        return textPane;
    }
    public void setTextPane(Gj19TextPane textPane) {
        this.textPane = textPane;
    }

    public Gj19ConcreteWindow(Gj19GraphicPane graphicPane,
            Gj19ListPane listPane,Gj19TextPane textPane) {
        this.graphicPane = graphicPane;
        this.listPane = listPane;
        this.textPane = textPane;
    }
    @Override
    public void doSomeThing(Gj19Pane pane, String order) {
        pane.update(order);
    }
}

抽象同事類-視窗格

package gjMediatorPattern;

/**
 * 抽象同事類-視窗格
 * 
 * @author gongjian
 *
 */
public abstract class Gj19Pane {

    private Gj19Window window;



    public Gj19Window getWindow() {
        return window;
    }



    public void setWindow(Gj19Window window) {
        this.window = window;
    }



    public abstract void update(String order);

}

具體同事類

package gjMediatorPattern;
/**
 * 具體同事類
 * @author gong
 *
 */
public class Gj19TextPane extends Gj19Pane{


    @Override
    public void update(String order) {
        System.out.println("TextPane接收到指令"+order);
    }

}

具體同事類

package gjMediatorPattern;
/**
 * 具體同事類
 * @author gong
 *
 */
public class Gj19GraphicPane extends Gj19Pane{


    @Override
    public void update(String order) {
        System.out.println("GraphicPane接收到指令"+order);
    }


}

具體同事類

package gjMediatorPattern;
/**
 * 具體同事類
 * @author gong
 *
 */
public class Gj19ListPane extends Gj19Pane{

    @Override
    public void update(String order) {
        System.out.println("ListPane接收到指令"+order);
    }

}

中介者模式客戶端

package gjMediatorPattern;
/**
 * 中介者模式客戶端
 * @author gong
 *
 */
public class Client {

    public static void main(String[] args) {

        Gj19ListPane gj19ListPane =new Gj19ListPane();
        Gj19TextPane gj19TextPane = new Gj19TextPane();
        Gj19GraphicPane gj19GraphicPane = new Gj19GraphicPane();
        Gj19ConcreteWindow concreteWindow = new Gj19ConcreteWindow(gj19GraphicPane,gj19ListPane, gj19TextPane);
        System.out.println("============系統發出請求===============");
        concreteWindow.doSomeThing(gj19GraphicPane, "影象放大1.2倍");
        concreteWindow.doSomeThing(gj19TextPane, "文字縮小到原來的0.8倍");
        concreteWindow.doSomeThing(gj19ListPane, "列表左移10px");
        System.out.println("=============系統結束===================");
    }

}

五、執行結果：