Question

• 如何组织“Java Swing”申请,以实现“MVC”结构?

Answer 1

i) 分类:

object classes: to represent objects
functionality classes: to provide functionality. for instance, methods to read/write files or methods to make calculations possibly using some object classes
and GUI classes (using Swing) which will be what the user will see. these classes will do what the functionality classes provide.

Answer 2

您的项目必须至少由三个实体组成:model、>、和>。你的模型代表了你的数据,认为你的数据和控制者既能产生观点,又能产生控制作用。



让我们 su开一个 rec子,希望建立一个全球倡议,在用户对面进行分类时显示试金的面积。

您的模型必须延伸到Observable等舱位,这样,你就把舱门标为你的<编码>MCV 架构的模版。

public class Square extends Observable {ecc....}

when you set the side, you have to set the state of the model as changed and notify observers which are listening on your model, such as:

public void setSide(double side) {
  this.side=side;
  setChanged();
  notifyObservers();
}

PS: setChanged() and notifyObservers() are provided by Observable class.

您, 观点必须执行<条码>观察员<>/代码>接口,以便你作为模型变化的倾听者加以标示。执行页: 1

public class Square_View implements Observer {
    JLabel area;
    ......
    @Overried
    public void update (Observable o, Object arg1) {
        Square square=(Square)o;
        area.setText(square.getArea());
    }

Well, as soon as your square s side changes, a notification is triggered and update method is invoked.

如今,MVC结构的思维方式是:

public class MyProgram extends JFrame {
      ... somewhere in your class
      Square s=new Square();
      Square_View sv=new Square_View();
      s.addObserver(sv);
}

正如我前面说过的那样,你既树立了榜样,又把观点登记为你的榜样。

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