最佳的處理組件的輸入Java中

Question

實踐考慮處理輸入的這3個例子：

/*EXAMPLE A*/ 
public class HandlingInputExampleA 
{ 
    private Label labelFromOtherClass; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 1; 

    private void init() 
    { 
     Button button = new Button(); 
     button.addClickListener(event -> labelFromOtherClass.setCaption(myText + myInt)); 
    } 
} 

public class HandlingInputExampleB 
{ 
    private ClickListener inputHandler; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 2; 

    private void init() 
    { 
     Button button = new Button(); 
     button.addClickListener(inputHandler); 
    } 
} 

/*EXAMPLE B*/ 
public class HandlingInputExampleB 
{ 
    private ClickListener inputHandler; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 2; 

    private void init() 
    { 
     Button button = new Button(); 
     button.addClickListener(inputHandler); 
    } 
} 

public class InputHandlerB implements ClickListener 
{ 
    private HandlingInputExampleB exampleB; //injected by setter 
    private Label label; //injected by setter/constructor 

    @Override 
    public void buttonClick(ClickEvent event) 
    { 
     Button button = event.getButton(); 
     if(button == exampleB.getButton()) 
     { 
      label.setCaption(exampleB.getMyText() + exampleB.getMyInt()); 
     } 
    } 
} 

/*EXAMPLE C*/ 
public class HandlingInputExampleC 
{ 
    private ClickListener inputHandler; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 2; 

    private void init() 
    { 
     Button button = new Button(); 
     button.setData(this); 
     button.addClickListener(inputHandler); 
    } 
} 

public class InputHandlerC implements ClickListener 
{ 
    private Label label; //injected by setter/constructor 

    @Override 
    public void buttonClick(ClickEvent event) 
    { 
     Button button = event.getButton(); 
     if(button.getData() instanceof HandlingInputExampleC) 
     { 
      HandlingInputExampleC exampleC = (HandlingInputExampleC)button.getData(); 
      label.setCaption(exampleC.getMyText() + exampleC.getMyInt()); 
     } 
    } 
} 

我想我應該保持我的項目處理輸入的一種方式。大多數時候我創建一個類來處理輸入，並且在那裏注入所有需要的對象，因此與用戶輸入相關的每個操作都在一個地方進行管理。當然，我的項目變得越大，輸入處理程序類就越大，並且開始顯得有些雜亂。也許我錯過了更好的解決方案？請告訴我應該避免哪些示例？

Answer 1

這取決於項目的大小以及需要多少個類似/不同的處理程序。 對於一些非常簡單的情況，我會選擇A，但是如果您有幾個類似的處理程序，最好提取一個新類。

例如，如果文本「exampleC.getMyText（）+ exampleC.getMyInt（）」執行過程中不改變我寧願：

public class HandlingInputExample { 
    private ClickListener inputHandler; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 2; 

    private void init() { 
     Button button = new Button(); 
     button.setData(this); 
     button.addClickListener(new SetCaptionClickListener(example.getMyText() + example.getMyInt())); 
    } 
} 

public class SetCaptionClickListener implements ClickListener { 
    private Label label; //injected by setter/constructor 
    private String caption; 

    public SetCaptionClickListener(String caption) { 
     this.caption = caption; 
    } 

    @Override 
    public void buttonClick(ClickEvent event) { 
      label.setCaption(caption); 
    } 
} 

但是，如果數據可能會改變您可以添加另一層是有責任來檢索處理程序所需要的信息，這樣的：

public class HandlingInputExample { 
    private ClickListener inputHandler; //injected by setter/constructor 
    private String myText = "hello "; 
    private int myInt = 2; 

    private void init() { 
     Button button = new Button(); 
     button.setData(this); 
     button.addClickListener(new SetCaptionClickListener(new Context(this))); 
    } 
} 

public class SetCaptionClickListener implements ClickListener { 
    private Label label; //injected by setter/constructor 
    private Context context; 

    public SetCaptionClickListener(Context context) { 
     this.context = context; 
    } 

    @Override 
    public void buttonClick(ClickEvent event) { 
     label.setCaption(context.getCaption()); 
    } 
} 

public class Context { 
    HandlingInputExample handlingInputExample; 

    public Context(handlingInputExample handlingInputExample) { 
     this.handlingInputExample = handlingInputExample; 
    } 

    public String getCaption() { 
     return handlingInputExample.getMyText() + handlingInputExample.getMyInt(); 
    } 
}